CN1328369C - Preparing pravastatin - Google Patents

Abstract

The present invention relates to a new microbial process for the preparation of compound formula (I) from a compound of general formula (II) wherein R stands for an alkali metal or ammonium ion, by the submerged cultivation of a mold strain able to 6 beta -hydroxylate a compound of Formula (II) in aerobic fermentation and by the separation and purification of the product of Formula (I) formed in the course of the bioconversion. The process comprises cultivating a strain of Mortierella maculata filamentous mold species that is able to 6 beta -hydroxylate a compound of general Formula (II), on a nutrient medium containing assimilable carbon and nitrogen sources and mineral salts and separating the product formed from the fermentation broth, then isolating the compound of formula (I) and purifying the same. Novel strains of Mortierella maculata are also disclosed.

Description

Culture

The application is that application number is dividing an application of the female case of CN200310123383.3.The applying date of this mother's case is on February 3rd, 2000; Denomination of invention is " culture ".

Technical field

The present invention relates to a kind of new culture, and the method that is used to prepare Pravastatin, specifically, relate to microbial process with the industrial-scale production Pravastatin.

Background technology

Atherosclerosis, the especially the most dangerous factor of coronary vasodilator obturation are the elevated cholesterol of blood plasma.Recent two decades has carried out research in depth to the 3-hydroxy-3-methylglutaryl-coenzyme A reductase enzyme (EC.1.1.1.34) as cholesterol biosynthesizing speed limit key enzyme.Pravastatin, the compound of a kind of formula I,

And other related compound (closely knit rhzomorph, Mevacor (mevinolin), Simvastatin) is competitive inhibitor [A.Endo etc., J.Antibiot.29, the 1346-1348 (1976) of HMG-CoA reductase enzyme; A.Endo etc., FEBS Lett.72,323-326 (1976); C.H.Kuo etc., J.Org.Chem.48,1991 (1983)].

Pravastatin is separated (Arai, M. etc., Sankyo Kenkyusyo Nenpo, 40,1-38,1988) by (undocumented results) such as M.Tanaka at first from dog urine between the closely knit rhzomorph metabilic stage of research.At present, Pravastatin is a kind of pravastatin, and it has best mechanism of action in treatment.Its most important characteristic is a tissue selectivity, and promptly for example its suppresses the synthetic of cholesterol at liver with in small intestine at two main positions of cholesterol generation (cholesterogenesis), and is difficult to detect the intracellular enzyme of restriction at other organ.Yet the cholesterol biosynthesizing restriction of Mevacor and Simvastatin but is significant (T.Koga etc., Biochim.Biophys.Acta, 1045,115-120,1990) in most of organs.

Pravastatin is different from Mevacor and the Simvastatin that has more the lipophilic feature in essence aspect chemical structure.Under the situation of back two kinds of compounds, the substituent end that is connected with the C-1 carbon atom of hexahydro-naphthalene skeleton is arranged in hexa-atomic lactonic ring, and under the situation of Pravastatin, do not have described lactonic ring, but there is the sodium-salt form of bioactive open chain dihydroxy acid.Another important structural difference is that Mevacor and Simvastatin are methyl in the C-6-position of hexahydro-naphthalene nucleus, and can see a hydroxyl in Pravastatin, and this causes further strengthening in its hydrophilic characteristic aspect.

As the result of said structure difference, Pravastatin penetrates the lipophilic film (A.T.M., Serajuddin etc., J.Pharm.Sci.80,830-834,1991) of peripheral cells with being merely able to utmost point low degree.

Can reach the suitability for industrialized production Pravastatin by two fermenting processs.In first fermenting process, the closely knit rhzomorph in preparation microorganism stage then in second fermenting process, on 6 beta-positions, by the microorganism hydroxylation, makes the sodium salt as the closely knit rhzomorph acid of substrate be converted into Pravastatin.

According to disclosed patent, with belonging to not generic mould bacterial classification and with the filamentous bacterium that belongs to Nocardia (Nocardia), with actinomadura (Actinomadura) and streptomyces (Streptomyces), the microorganism hydroxylation of closely knit rhzomorph (No. the 895090th, belgian patent specification sheets, Japanese patent specification the 5th can be finished in varying degrees, 810, No. 572, United States Patent (USP) the 4th, 537,859 and 4,346, No. 227 and disclosed European Patent Application No. 0605230).For example mucor hiemalis (Mucor hiemalis), Syncephalastrum nigricans, cunninghamella echinulata (Cunninghamella echinulata) carry out the bio-transformation of closely knit rhzomorph substrate with 500 μ g/ml concentration with the bacterial strain that belongs to procaryotic Nocardia, actinomadura and streptomyces with 2000-4000 μ g/ml to disclose the use filamentary mould.

Produce a FAQs that experiences under the situation of Pravastatin with filamentary mould is because the antifungic action of closely knit rhzomorph, causing that microorganism can not tolerate adds in the culture even closely knit rhzomorph substrate (Serizawa etc., J.Antibiotics, 36 of lower concentration, 887-891,1983).When the Japanology personnel further investigate hydroxylation with Streptomyces carbophilus, also observe the cytotoxicity (M.Hosobuchi etc., Biotechnology andBioengineering, 42,815-820,1993) of this substrate.

The Japan author has managed to improve with recombinant DNA technology the hydroxylation ability of Streptomyces carbophilus bacterial strain.The hydroxylation of closely knit rhzomorph needs cytochrome P-450 monooxygenase system (Matsuoka etc., Eur.J.Biochem.184,707-713,1989).Yet, according to described author's research, in the cytochrome P-450 monooxygenase system of bacterium, not a kind of but several albumen work in electron transport, this makes the application difficulty more of described dna technique.Developing the effective microorganism hydroxylation of the cost method that is used to produce Pravastatin is extremely difficult and complicated work.

The objective of the invention is to describe in detail a kind of new microbial process that is used for technical scale from closely knit rhzomorph production Pravastatin, described method can more produced Pravastatin under the advantageous conditions than those methods of previously known.During our research work, we have attempted above all researchs, to find to contain the microorganism strains of the hydroxylase that might be suitable for making closely knit rhzomorph microbial transformation the Pravastatin that is high density.

Summary of the invention

The present invention relates to a kind of being used for from the substrate compounds of formula (II)

Wherein R represents a kind of basic metal or ammonium ion,

The microbial process of preparation formula (I) compound,

Said method comprising the steps of: (a) on the nutritional medium that contains assimilable carbon source and nitrogenous source and inorganic salt, cultivation can be with the bacterial strain of the Mortierella maculata filamentary mould bacterial classification of formula (II) compound 6 β-hydroxylation; (b) substrate to be transformed is added in the formed Mortierellamaculata culture; (c) allow described fermenting substrate till bio-transformation finishes; (d) compound of separate type (I) from described culture meat soup; (e) compound of the described formula of separation and purification (I).

The invention still further relates to and be preserved in the state-run agricultural of Budapest, HUN and industrial microorganism preservation center, preserving number are the biologically pure culture of the Mortierella maculata n.sp.E-97 bacterial strain of NCAIM (P) F 001266; And the biologically pure culture of the mutant strain Mortierellamaculata n.sp.E-97/15/13 bacterial strain of described bacterial strain, this mutant strain is preserved in state-run agricultural of Budapest, HUN and industrial microorganism preservation center, and preserving number is NCAIM (P) F 001267.

Description of drawings

Fig. 1 illustrates the physical features of Mortierella maculata n.sp.E-97.

Embodiment

In the process of our screening procedure, covered about 5500 kinds of protokaryons and eucaryon bacterial strain, selected 23 kinds of microorganisms, what described 23 kinds of microorganisms conversely can the closely knit rhzomorph of hydroxylation.In these bacterial strains, a kind of filamentary mould proves and is more suitable in producing Pravastatin because with from the known bacterial strain of publication relatively, it is higher to the resistance of closely knit rhzomorph.According to means of taxonomic research, this bacterial strain proves a kind of new representative bacterial classification (Mortierella maculata n.sp.) that belongs to genus mortierella (Mortierella).From selected mould, on the one hand, by using mutant-system of selection, on the other hand, by inducing the hydroxylase of described bacterial strain, be separated to a kind of new bacterial strain, described new bacterial strain can make closely knit rhzomorph substrate hydroxylation become Pravastatin with greater concn by discloseder bacterial strain than up to now.As mutagenic compound, can use physics and chemical mutagen (UV irradiation, methyl mesylate, N-methyl-N '-nitro-N-nitrosoguanidine).After the mutagenic treatment, in order to prepare haploid cell, spore suspension is coated on the agar plate that contains benomyl, then in order to induce hydroxylase, the colony inoculation that forms is contained 8-at 100 μ g/ml to be taken off-(2-methyl-butyryl)-closely knit rhzomorph or contain on the agar plate of closely knit rhzomorph.By the application of these methods, prepare mutant strain from can closely knit rhzomorph being converted into the new bacterial strain of Pravastatin in the degree that is significantly higher than parental strain.

In the process of optimization experiment, the best approach that we have determined to be used for the most useful inoculum of closely knit rhzomorph hydroxylation and best biotransformation medium and have repeated to add closely knit rhzomorph with high density.

Therefore, the present invention is based on the called after E-97 of the isolating mould of Mortierella maculata by name and the discriminating of E-97/15/13 bacterial strain, described bacterial strain is preserved in state-run agricultural and industrial microorganism preservation center (Department of Microbiology and Biotechnology.University of Horticulture and the Food Industry Budapest), its preserving number is respectively NCAIM (P) F 001266 and NCAIM (P) F 001267, they are under suitable fermentation condition, can produce Pravastatin high-levelly, and during bio-transformation, only obtain a small amount of or micro-unwanted related compound, 6 Alpha-hydroxies of sour form-closely knit rhzomorph for example, 2 Alpha-hydroxies-closely knit rhzomorph, 8-takes off-(2-methyl-butyryl)-closely knit rhzomorph, 3 α, 5 beta-dihydroxyies-5,6-dihydro-different closely knit rhzomorph, 8a, the hydroxylation derivative on the position 2 and 3 of beta-hydroxy-closely knit rhzomorph and the 2-methyl-butyryl side chain that is positioned at closely knit rhzomorph.Therefore, these bacterial strains are particularly suitable for the industrial-scale production Pravastatin.

The technical scale economic production of considering described effective constituent changes with closely knit rhzomorph concentration of substrate, therefore importantly has the bacterial strain that can tolerate high compact rhzomorph and Pravastatin concentration.Therefore, an integral part more of the present invention is to recognize: the hydroxylation ability that can improve original mould isolate by using mutant-selection and enzyme induction method, and, can in one step, realize a large amount of closely knit rhzomorph hydroxylations are become Pravastatin by the suitable substrate addition means of exploitation.In a word, the new mutant bacterial strain of called after Mortierella maculata n.sp.E-97/15/13 is particularly suitable for producing Pravastatin.

Hereinafter summarized the most important discriminating attribute taxonomy feature relatively of described isolating new mould bacterial classification and known mortierella bacterial classification.

The taxonomy of holotype bacterial strain Mortierella maculata nov.spec.E-97 is described

On starch-casein-wort-nutrient agar, form aerial mycelium (the thick tectum of 10 μ m of surpassing is arranged on the substrate mycelium) well.During beginning, it shows as the closely white net of braiding of mycelia, afterwards, the sparse light yellow sporulation spot with several millimeters straight warps (newname " maculatus " is meant above-mentioned spot) occurs.This pale yellow color can occupy the big continuous surface that gas is given birth to net sometimes.The color great majority of substrate mycelium are colourless or light yellow on Czapek nutrient agar, blood-Czapek nutrient agar, tyrosine nutrient agar, starch-casein agar substratum, wort agar substratum etc.The color of substrate mycelium net is an incarnadine on yeast extract-glucose-protein culture medium.In fact on above listed substratum, do not produce and to spread and soluble pigment, perhaps seldom on these substratum, produce very shallow light yellow.The bacterium colony of bacterial strain E-97, because it produces volatile oil, and similar to other bacterial classification (except the bacterial classification of Mortierella isabellina group (section Isabellina)) of many genus mortierellas, can distribute a kind of very distinctive strong fragrance.

By the sporangiophore of the Ref. No. 1-7 among Fig. 1 name, usually (and less) on the aerial hyphae on the substrate mycelium with a large amount of mutually between very different local formation of distance.They are branch not, but majority is straight or crooked.Their length is generally 60-80 μ m.Starting point in most cases is the mycelia zone that the gas of lacking substantially but expanding is strongly given birth to net, and they are separated by cell wall.Sporangiophore self also can expand (being consumingly sometimes), shown in Ref. No. 6, but on sporangial direction, they by 5.0-9.0 μ m gradually constriction to 1.0-2.0 μ m.Important taxonomy feature is under described sporangiophore, and they never widen (referring to Ref. No. 8).

Sporocyst is spherical; Be the spheroid that flattens slightly in some cases.They directly through being about 6.0-17.0 μ m, littler than the observed value of other mortierella bacterial classification.In the sporocyst many spores can be arranged, also exist but only have in the sporocyst of a spore.Spore 9 is cylindrical or not too oval.Their size is 3.0-5.0 * 1.5-2.0 μ m.In single spore, can there be 1 or 2 little dark-coloured spherical oil droplets 10.Because sporangial wall is very easy to decompose, therefore in wet environment, spore can scatter soon.After sporocyst disintegrates,, can observe tiny tuning fork sample " capsule neck " and a kind of very (but not being typical) columella of short degeneration sometimes at the end of sporangiospore.Spherical or columniform gemma 15-28 can form on most of different differential mediums.Common size is 10-25 μ m.In described substratum, also can see the chain, blastogenesis cell of spherical gemma 13, the spore 15-23 of sprouting, a mycelia and merge spline structure and giant cells etc. around mycelia association 11, the mycelia of the specific spiral growth of another mycelia.In aerial mycelium, can also observe big (directly through 50-250pm) very fine and close mycelia net 14, but not have detectable zygote to exist.

The culture of bacterial strain E-97 can make nitrate reduction become nitrite, not hydrolyzed starch, Vitamin C2, arginine or gelatin, but hydrolysis tween polysorbates does not decompose the paraffinic hydrocarbon class.The culture of bacterial strain E-97 has urease activity, shows good growth between pH 7.0-9.0, tolerates maximum 2%NaCl.The effect of xanthine, xanthoglobulin, Yelkin TTS, tyrosine and VITAMIN B4 is a negative effect.From glucose, fructose, glycerine and semi-lactosi, detected the strong acid that culture produces, but do not produced or produced seldom strong acid from wood sugar, pectinose, raffinose, Sorbitol Powder, inositol, inulin etc.On pyruvate salt and acetate, detect weak growth, but find to contain benzoate, salicylate, can not grow when Citrate trianion, lactic acid salt, succinate, tartrate and malonate.Well-grown when observing with glucose and fructose as the sole carbon source of substratum.Wood sugar, pectinose, rhamnosyl, sucrose, raffinose, N.F,USP MANNITOL and inositol utilize evidence negative.Described culture is decomposition of cellulose not.

The systematics position: bacterial strain E-97 belongs to Mortierellaceae, and it is a typical member of genus mortierella: many spores are generally arranged in the sporocyst, and columella is extremely degenerated, and usually has gemma, do not detect zygosporic existence, bacterium colony distributes a kind of very distinctive strong aroma.In genus mortierella, bacterial strain E-97 is typical case's representative of " Mortierella alpina group (Section Alpina) ".The latter to be characterized as sporangiophore extremely short, branch (maximum length is 200 μ m) not, and the small (Zycha of sporocyst, H.und Siepmann, R, Mucorales.EineBeschreibung aller Gattungen und Ar dieser Pilzgruppe.D-3301 Lehre, Verl.von J.Cramer.1969).In the member of Mortierella alpina group, bacterial strain E-97 and bacterial classification Sa Ke mortierella (M.thaxteri Bj  rling 1936) and kidney spore mortierella (M.renisporaDixon-Stewart 1932) show the highest similarity.Yet the data of Table I clearly illustrate that the difference of the identification feature aspect of bacterial strain E-97 and these two kinds.Therefore, as a novel species, we are with described bacterial strain called after Mortierella maculata nov.spec.E-97 thus.

Table 1

According to key identification feature, the holotype bacterial strain E-97 of Mortierella maculata n.sp. and bacterial classification kidney spore mortierella and Sa Ke mortierella are compared

	Kidney spore mortierella	Mortierella bacterial strain E-97	The Sa Ke mortierella
				The origin of sporangiophore	Common, yet mycelia is more roomy than normal mycelia, and side is from enlarging the expansible mycelia	Non-from (expand or normally) aerial hyphae or substrate mycelium from giving birth to regional adnation.	From aerial hyphae to expand from tight knot section or substrate mycelium be non-from tight knot section adnation
The shape of sporangiophore and size	Contract carefully to 3 μ m by 10 μ m gradually to top orientation.Length is about 200 μ m.	Majority is straight or crooked, not branch.Width is contracted carefully to 1.5-2.5 μ m by 5-9 μ m gradually to the top.Length is about 60-80 μ m.In not overstriking of top.	The about 60-90 μ of length m.The width of starting point is about 5-7 μ m, contracts on the top carefully to 1.5-2 μ m.In the overstriking immediately of sporocyst place.
				Sporangial shape and size	Colourless, directly through being 25 μ m.	Majority is spherical (directly through 6-17 μ m), and few for not too flat.Generally contain many spores, seldom contain a spore.	Spherical (directly through 12-20 μ m).They contain many spores, but on some substratum the sporocyst that only contains a spore are arranged also.
Sporangial wall (film)	Expanded film.Still keep capsule neck spline structure after the disintegration.	Disintegrate.Keep tuning fork sample capsule neck.	Disintegrate, keep the capsule neck of small reverse bending.
				The shape of spore	Kidney shape roughly.Transparent knot	Cylindrical.Length (3-5 μ m)	Oval transparent spore, size

And size	Structure, size are 2 * 4 μ m.	Twice that can greater than width (1.5-2 μ m).	Be 3.5-4 * 1.5-2 μ m.
				Gemma	On most of different substratum, generate.	Usually be present on the very different substratum, majority is present in the aerial mycelium.Spherical or elongated (10-25 μ m).	The oval gemma (10-14 μ m) of giving birth in the middle of the substrate mycelium.
Zygote	Usually be present on all differential mediums.Add cover mycelia directly through being about 500 μ m, be about 30 μ m when not having them.	Do not detect.	Do not observe.
				The fine and close kitchen range (foci) of mycelia net		Usually be the big fine and close mycelia kitchen range (50-250 μ m) that weaves, and do not have zygote.	In old culture, be the fine and close mycelia net of big (directly through 100-125 μ m) ecru, no zygote.
Color of aerial mycelium and habit	Loose and always white mycelia net	White and light yellow spot.	Begin to be the Spider Web sample, finer and close afterwards.

Preparing according to the present invention in the method for Pravastatin, preferably using the fungal strain culture of called after Mortierella maculata n.sp.E-97 or its called after E-97/15/13 mutant strain.So selected bacterial strain is because its quick growth is highly preferred bacterial strain.As carbon source, it utilizes glucose, glycerine, fructose or semi-lactosi easily.As nitrogenous source, can utilize yeast extract, peptone, casein, meat extract, soyflour, corn steep liquor, SODIUMNITRATE or ammonium sulfate.

At the substratum that is used for producing Pravastatin, except that above carbon source and nitrogenous source, can also contain inorganic salt (for example potassium primary phosphate, magnesium chloride, sal epsom), trace element (ferrous salt, magnesium salts), amino acid and defoamer.

According to an embodiment preferred of the present invention, will be inoculated in the seed culture medium by the spore suspension of the Mortierellamaculata n.sp. agar slant culture preparation of the mutant strain [NCAIM (P) F 001267] of called after E-97 bacterial strain or its called after E-97/15/13; Then, will approximately 25-30 ℃, preferably approximately 24-28 ℃, most preferably in about 28 ℃ of 10% inoculum transferred speciess of cultivating 3 days down in biotransformation medium.Then with its approximately 25-28 ℃, be preferably in about 28 ℃ and cultivated 4 days, the sodium salt with glucose and closely knit rhzomorph acid adds in the described culture then.According to the concentration of the closely knit rhzomorph substrate that is added, will cultivate and under aerobic conditions continue to carry out again 2-12 days, pH is remained between the 5.5-7.5, be preferably in 7.0.Under stirring and aeration condition, this moment, air velocity was 0.2vvm, and the rotating speed of agitator is 400/ minute, carries out bio-transformation.

During the fermentation, after the bio-transformation of closely knit rhzomorph substrate, carry out high pressure liquid chromatography (HPLC) method (HPLC) again.According to this method,, centrifugal then with methyl alcohol with 2 times of described meat soup diluted samples, supernatant liquor is used for HPLC analyzes under following parameter: Waters analysis mode HPLC instrument; Pillar: Nucleosil C ₁₈10 μ m; Detect wavelength: 238nm; Volume injected: 20 μ l, flow velocity: 1ml/ minute; Adopt gradient elution, elutriant: A=0.05% phosphate aqueous solution, B=acetonitrile.

Gradient:

Time (minute)	Elutriant A (%)	Elutriant B (%)
			0	70	30
20	0	100
			25	0	100
25.1	70	30
			35	70	30

Approximate retention time: Pravastatin 8.6-9.0 minute; Closely knit rhzomorph acid 11.6-12.0 minute; Pravastatin lactone 15.0-15.5 minute, closely knit rhzomorph 16.5-17.0 minute.

In order to produce Pravastatin, the sodium-salt aqueous solution of cultivating that added closely knit rhzomorph acid on the 96th hour.For this method, followingly prepare described substrate with solid form.In 40 ℃, in the 0.2M sodium hydroxide solution with closely knit rhzomorph lactone hydrolysis 2 hours, with hydrochloric acid the pH of reaction mixture is transferred to 7.5 then, described neutral solution is layered on the Diaion HP-20 adsorption column; Remove the sodium-chlor that generates during the neutralization reaction by washing pillar with water, use the sodium salt of the closely knit rhzomorph acid of 50% aqueous acetone solution wash-out from pillar then.After this, vacuum distilling washings and with the aqueous residue freeze-drying.After the neutralization reaction, also can be with the aqueous solution of the alkaline hydrolysis product of closely knit rhzomorph directly as substrate.In this case, measure the sodium salt content of closely knit rhzomorph acid in the hydrolysate, and before using, described solution is preserved in 20 ℃ always by HPLC.

PH to the 4th day meat soup that ferments is high more, and is favourable more to the hydroxylation of closely knit rhzomorph substrate.When the pH of meat soup surpasses 6.3, allow to begin to add closely knit rhzomorph substrate.At the 4th day of fermentation, the sodium-salt aqueous solution that adds the closely knit rhzomorph acid of Sterile Filtration as required was 500 μ g/ml to reaching concentration.Followingly also will be added in the described culture: if the pH value of meat soup is higher than 6.7 at 25 minutes 50% glucose solutions of 121 ℃ of sterilizations, then add 1% glucose corresponding to described meat soup volume, if and pH is in the scope of 6.3-6.7, then the amount of the glucose of Tian Jiaing is 0.5%.From meat soup, consume the sodium salt of closely knit rhzomorph acid after 24 hours, by its conversion of HPLC determination and analysis.In this case, every milliliter of meat soup adds the closely knit rhzomorph of 500 μ g in addition.Except that closely knit rhzomorph substrate, also add glucose as mentioned above.The morphological feature of 120 hours cultures is microsphere (pellet) growth (spheroid is straight through being 0.5-3.0mm).After 24 hours, consume the substrate of second dosage again from meat soup, therefore, adding generation concentration in full meat soup is the sodium salt of the closely knit rhzomorph acid of another part of 500 μ g/ml, and according to the parallel interpolation glucose of the pH value of meat soup.From the 4th day of fermentation, the frequency with every day repeated to add described substrate and glucose as mentioned above, till 17-18 days that ferment.

In order from meat soup, to reclaim described product, preferably consider during bio-transformation, to generate the fact of Pravastatin with its sour form, therefore, it can be separated from the filtrate of meat soup by its absorption on anion-exchange resin column.In order to separate described product, preferably utilize strongly basic anion exchange resin, it is the polystyrene-divinylbenzene polymkeric substance that has the quaternary ammonium active group.Be mixed into by anionite-exchange resin in the filtrate of meat soup, described product is directly adsorbed from described filtrate OH-form.With the acetone-water mixture of acetate or sodium chloride-containing, preferably, can from described pillar, will come out at the product wash-out that anionite-exchange resin is adsorbed with acetone-water (1: the 1) mixture that contains 1% sodium-chlor.Merge the flow point that contains Pravastatin, vacuum distilling goes out the acetone in the washings.With 15% sulfuric acid the pH of enriched material is transferred to the scope of 3.5-4.0, aqueous solution ethyl acetate extraction.Wash acetic acid ethyl ester extract with water, and use anhydrous sodium sulfate drying.Prepare lactone derivatives with Pravastatin then.Under continuously stirring, induce lactone to generate by the trifluoroacetic acid that exists in order to catalytic amount, in the closure of in the exsiccant ethyl acetate solution, carrying out lactonic ring under the room temperature.Check conversion process by thin layer chromatography analysis (TLC).After finishing the lactone generation, ethyl acetate solution at first with the washing of 5% sodium bicarbonate aqueous solution, washes with water then, uses anhydrous sodium sulfate drying and vacuum-evaporation again.Resistates after the evaporation is used activated carbon treatment in acetone soln, and then evaporation, and from the fatty alcohol that contains 1-4 carbon atom, recrystallize from ethanol preferably.As elutriant, use silica gel column chromatography, with the ethyl acetate-normal hexane mixture that uses ethyl acetate content to increase gradually with the evaporation residue purifying of recrystallize mother liquor.

By in the acetone at room temperature with the sodium hydroxide hydrolysis of equivalent, with behind the recrystallize and the pravastatin lactone that obtains of chromatography purification prepare Pravastatin.After the generation of finishing sodium salt of pravastatin, reaction mixture dilute with water and neutralization, vacuum distilling acetone content.On the post that contains the DiaionHP-20 resin, from resulting aqueous residue, adsorb Pravastatin, use deionized water wash, use acetone-deionized water mixture wash-out from the described pillar again.The flow point that will contain Pravastatin then merges, and distills out the acetone content, can obtain the high purity Pravastatin after with the aqueous residue freeze-drying, can be with its recrystallize from the ethyl acetate-ethanol mixture.

In the process of described method, can adsorb the Pravastatin of whole amounts.At the pravastatin lactone period of contact, also may generate 3 Alpha-hydroxies-different-closely knit rhzomorph and other by product.Though the reaction of these back reduces described isolating yield, those compounds can separate by above-mentioned purification process, therefore can produce the Pravastatin of pharmaceutically acceptable quality by this way.

After finishing bio-transformation, perhaps from fermenting broth or the filtrate that after separating thread fungal cell, obtains, can extract Pravastatin.Perhaps by filtering or can removing the filamentary mould cell by centrifugal; Yet, especially in technical scale, preferably prepare full meat soup extract.Before the extraction, with mineral acid, preferably use dilute sulphuric acid, with or the pH of the filtrate of fermenting broth or meat soup transfer to 3.5-3.7.With the ester of acetate and contain the fatty alcohol of 24 carbon atoms, preferably with ethyl acetate or isobutyl acetate, carry out described extraction.Extraction step should be carried out very soon, to avoid generating described lactone derivatives by Pravastatin under acid pH.

Can make the sour form of Pravastatin transfer to aqueous phase from the organic solvent extraction thing as sodium salt.For example, can from acetic acid ethyl ester extract, extract Pravastatin with 5% sodium bicarbonate or the alkalescent water (pH7.5-8.0) of 1/10 and 1/20 volume ratio.Find from the above alkaline aqueous extract that obtains, can be recovered to the Pravastatin of pure form by using the column chromatography of non-ionic adsorption resin.A kind of preferred method is at first to remove the solvent that is soluble in the aqueous phase by vacuum distilling from alkaline aqueous extract, then with the aqueous extract application of sample to Diaion HP-20 post.

Just the sodium salt of pravastatin that adsorbs on described pillar carries out wash-out by the acetone content that increases the aqueous solution gradually and is purified, and the main flow point that will contain Pravastatin then merges and vacuum concentration.Aqueous concentrates obtains to contain the washings of pure Pravastatin further by chromatography and purifying on another Diaion HP-20 post, with its with activated carbon clarification and freeze-drying after, can obtain the Pravastatin of pharmaceutically acceptable quality.

This separation method comprises still less step than previous method, generates and hydrolysis because do not relate to the lactone of Pravastatin in described method.Between described separation period, make Pravastatin under acidic conditions, only expose finite time, because therefore its stability stable low than in neutrality or basic solution, in fact do not generate artefact (artefacts) in this separation method under acidic conditions.

In addition, the purification by chromatography Pravastatin on the Sephadex LH-20 dextrane gel (hydroxypropyl derivative) is preferably used in discovery.By using this method, can produce the Pravastatin that purity surpasses 99.5% (measuring by HPLC).

In our experimentation, have realized that with described filamentary mould or filamentous bacterial strain and especially can Pravastatin be precipitated out as crystal salt with secondary amine with the organic solvent extraction thing of the meat soup of the Mortierella maculata n.sp. bacterial strain of the compound 6 β-hydroxylation of general formula (II) or meat soup nitrate, preferably with ethyl acetate or isobutyl acetate extract.Also find the generation for salt, several secondary amine that contain alkyl substituent, naphthenic substituent, aralkyl substituting group or aryl substituent are suitable.In them, select convenient nontoxic secondary amine, for example Di-Octyl amine, dicyclohexyl amine, dibenzylamine.By the Pravastatin content that adds with respect to extract is the dibenzylamine of 1.5 a great deal oves, carry out for example separation of dibenzyl amine salt of described organic secondary amine salt intermediate, make extract be concentrated into 5% of its initial volume by vacuum distilling then, join in the described enriched material with the dibenzylamine of 0.2 a great deal of ratio more at last another amount.Crystal dibenzyl amine salt is precipitated out from described enriched material.Filter crystal raw product and vacuum-drying.Then with gac with its clarification and in acetone recrystallize.

Comprise therein in the previous described method of organic solvent extraction and reextraction under the alkaline pH, can also be used to replacing the purifying of column chromatography based on the separation method of secondary amine salt formation.In this case, preferably from the isobutyl acetate extract that after alkaline aqueous extract acidifying, obtains, precipitate Pravastatin dibenzyl amine salt.

With sodium hydroxide or sodium alkoxide, sodium ethylate preferably, can make the organic secondary amine salt of Pravastatin change into Pravastatin.

Described conversion is described in detail under the situation of Pravastatin dibenzyl amine salt.In isobutyl acetate-water mixture, is 8.0-8.5 by the scope that under agitation keep pH then with the dibenzylamine salt suspension of recrystallize, is added in the described suspension with the sodium hydroxide of the aqueous solution with equivalent.After described suspension dissolving, separate each phase, contain the aqueous solution isobutyl acetate washed twice of Pravastatin.The aqueous solution is clarified and freeze-drying with gac, obtains the Pravastatin of pharmaceutically acceptable quality.

Being used for a kind of preferred method that Pravastatin dibenzyl amine salt is converted into Pravastatin is that dibenzylamine salt suspension with recrystallize is in ethanol, then under agitation with equivalent or slightly excess ethanol sodium be added in this suspension, vacuum concentration reaction mixture then, and, Pravastatin is precipitated out from enriched material with crystallized form by adding acetone.

Being used for another preferred method that Pravastatin dibenzyl amine salt is converted into Pravastatin is that dibenzyl amine salt with recrystallize is dissolved in the ethyl acetate-ethanol mixture, ethanolic soln with equivalent or excessive slightly sodium hydroxide is added in the described solution then, makes the Pravastatin precipitation.

Separate Pravastatin by secondary amine salt intermediate, all simpler than the separation method of any previously known.In this separation method, do not generate artifact (artifacts), and do not need to use any chromatography method, just can solve from the bio-transformation by product with from by separating Pravastatin the various meta-bolitess of hydroxylation microorganism biological synthetic.

The structure of the isolating secondary amine salt of Pravastatin, pravastatin lactone and Pravastatin by UV, IR, ¹H-NMR, ¹³C-NMR and mass spectroscopy confirm.

Embodiment

More fully describe and understand the present invention with reference to following examples, described embodiment provides as an illustration rather than is used for limiting the scope of the invention by any way.

Embodiment 1

Prepare spore suspension with 5ml 0.9% sodium chloride solution, this solution derives from can be with Mortierella maculata nov.spec.E-97[NCAIM (P) F 001266 of closely knit rhzomorph 6 β-hydroxylation] the 7-10 age in days wort-yeast extract agar slant culture of bacterial strain, with the 100ml seed culture medium PI that sterilizes in the described suspension inoculation 500ml Erlenmeyer flask.

The composition of substratum PI:

Glucose 50g

Soyflour 20g

Be dissolved in the 1000ml tap water.

PH with substratum before the sterilization transfers to 7.0, sterilizes 25 minutes for 121 ℃ then.In 28 ℃ culture was gone up jolting 3 days at rotary shaker (250rpm, 2.5cm amplitude), then with culture transferred species that 10ml obtained in 25 minutes 100-100ml biotransformation medium MU/4 of 121 ℃ of sterilizations in the 500ml Erlenmeyer flask.

The composition of substratum MU/4:

Glucose 40g

Soyflour 20g

Casein-peptone 1g

L-asparagine 2g

Potassium primary phosphate 0.5g

Be dissolved in the 1000ml tap water.

PH with substratum before the sterilization transfers to 7.0, sterilizes 25 minutes for 121 ℃ then.

In 25 ℃ Erlenmeyer flask is gone up jolting 4 days at rotary shaker (250rpm, 2.5cm amplitude), the aqueous solution form with Sterile Filtration is added to the closely knit rhzomorph substrate of 50-50mg (sodium salt of closely knit rhzomorph acid) in the culture then, proceeds then to cultivate.Equally, at the 5th day, the sodium salt of the closely knit rhzomorph acid of other 50-50mg is added in this mould culture, and makes fermentation proceed 24 hours again.Measure Pravastatin content in the meat soup by HPLC.Fermentation is proceeded 168 hours.When bio-transformation finished, the Pravastatin mean concns was 620 μ g/ml in the fermenting broth.

Embodiment 2

In the fermentor tank of 5 liters of working volumes of laboratory scale, preparation MU/S biotransformation medium adds the nutrient media components corresponding to 5 liters of volumes, but 4.5 liters of application of samples at the most only, sterilized 45 minutes for 121 ℃ then, use 500ml inoculum inoculation according to embodiment 1 preparation.

The composition of substratum MU/8:

Glucose 20g

Glycerine 20g

Soyflour 20g

Peptone 5g

Potassium primary phosphate 0.5g

Polypropylene glycol 2000 1g

Be dissolved in the 1000ml tap water.

PH with substratum before the sterilization transfers to 7.0 values.

Be 400rpm and be under 60 liters/hour in 28 ℃, stir speed (S.S.), described fermentation was carried out 4 days from the Ventilation Rate of bottom direction.After the transferred species the 2nd day, culture begins serious foaming, and this foam can reduce by adding polypropylene glycol 2000 again.At the initial stage (16-20 hour) of fermentation, pH is reduced to 5.0-5.5 from 6.5 initial value, reaches 6.3-7.5 then since increase in the 3rd day and at the 4th day.If the pH of meat soup greater than 6.3, then allows to begin to add closely knit rhzomorph substrate.At the 4th day that ferments, add the closely knit rhzomorph substrate of 2.5g with the Sterile Filtration aqueous solution.Calculate the volume of meat soup, be parallel to the substrate that is added,,, 0.5-1.0% glucose is joined in the culture with 25 minutes 50% solution form of 121 ℃ of sterilizations according to pH.After 24 hours, consume closely knit rhzomorph substrate from culture, this can detect by HPLC by the sample from take from fermentor tank.In this case, add closely knit rhzomorph substrate of 2.5g and glucose as mentioned above, and when described substrate is converted into Pravastatin, this bio-transformation was carried out 24 hours again.

After finishing described fermentation, 5.1 liters of meat soups that contain 630 μ g/ml Pravastatins filter with filter cloth.2 premium on currency are joined in the isolating mycelium, then the mycelium suspension was stirred 1 hour, filter then.These two kinds of filtrates are mixed, and on the pillar that contains 138g (250ml) Dowex Al 400 (OH) resin (pillar directly through 3.4cm, resin bed height 28cm), passed through, then resin bed 300ml deionized water wash with flow velocity 500ml/ hour.Subsequently, with 1 liter of acetone-water (1: 1) mixture that contains 10g sodium-chlor resin is carried out wash-out.The volume of flow point is each flow point 100ml.By following thin-layer chromatography (TLC) methods analyst washings: sorbent material: Kieselgel 60F ₂₅₄DC (Merck) aluminium foil; Developping agent: acetone-benzene-acetate (50: 50: 3) mixture; Detect: use Sonnenschein's reagent.The R of Pravastatin _fValue is 0.5.Merge the flow point that contains described product, vacuum distilling goes out acetone.With 15% sulfuric acid the pH of 400ml enriched material is transferred to 3.5-4.0, use the 150ml ethyl acetate extraction then 3 times.Acetic acid ethyl ester extract is merged, use anhydrous sodium sulfate drying.Subsequently, under room temperature, continuously stirring, by adding trifluoroacetic acid with catalytic amount from Pravastatin acid preparation pravastatin lactone.The generation of pravastatin lactone is by the TLC control (R of the pravastatin lactone in the above-mentioned TLC system _fValue is 0.7).After lactone generated and finishes, described ethyl acetate was used the 50ml water washing then with the washing of 2 * 50ml, 5% sodium bicarbonate aqueous solution, with anhydrous sodium sulfate drying and vacuum-evaporation.The evaporation residue of the 3g that obtains amount is dissolved in the 100ml acetone and with the 0.3g gac clarifies.Filter then and remove gac, vacuum-evaporation acetone.The raw product that obtains crystallization from 20ml ethanol.Sedimentary crystal pravastatin lactone is filtered out, on strainer, wash, vacuum-drying under room temperature with the 30ml normal hexane.Obtain the chromatographically pure pravastatin lactone of 1.5g like this.Fusing point 140-142 ℃, [α] _D=+194 ° (c=0.5, methyl alcohol).The vacuum evaporating crystalization mother liquor obtains the 1.2g evaporation residue, and this resistates is at the pillar that contains 24g Kieselgel 60 sorbent materials (the straight warp of pillar: 1.6cm, the height of bed: 20cm) go up chromatography.The raw product that will be dissolved in 5ml benzene is layered on this pillar.Use ethyl acetate-normal hexane mixture to carry out wash-out, wherein increase the content of ethyl acetate gradually.Pravastatin lactone wash-out from this pillar can be come out with 60% ethyl acetate-40% normal hexane mixture.The mixture that adopts ethyl acetate-normal hexane (9: 1) is as developping agent, by TLC control flow point.Merge the flow point that contains pravastatin lactone, vacuum-evaporation.According to this method, obtain the pure product of 0.3g, its quality is identical in quality with the pravastatin lactone that obtains by crystallization.

The two batches of pravastatin lactones are mixed, prepare sodium salt then in accordance with the following methods: the 1.8g pravastatin lactone is dissolved in the 20ml acetone, stirs and add 4.5ml 1M aqueous sodium hydroxide solution down, so at room temperature with this solution stirring 0.5 hour.After intact salifiable generation, 20ml water is joined in the mixture, make the solution neutralization, then vacuum-evaporation acetone.With pillar (pillar straight warp: 2.6cm, the height of bed: 30cm) go up chromatography of aqueous concentrates in the filling of usefulness 150ml Diaion Hp 20 resins.As eluent, use the mixture of acetone-deionized water, wherein the concentration of acetone increases with 5% substep.With the acetone-deionized water mixture that contains 15% acetone, Pravastatin is washed out from pillar.Analyze flow point by TLC.Merge the flow point that contains described product, vacuum-evaporation acetone.By the freeze-drying aqueous residue, obtain the 1.3g Pravastatin.Crystallization goes out chromatographically pure product from the mixture of ethanol and ethyl acetate.

Fusing point: 170-173 ℃ (decomposition)

[α] ^D ₂₀=+156 °, (c=0.5 is in the water).

Ultra-violet absorption spectrum (20 μ g/ml are in the methyl alcohol): λ _Max=231,237,245nm (log ε-4.263; 4.311; 4.136)

Infrared absorption spectrum (KBr): υ OH 3415, υ CH 2965, υ C=O 1730, υ COO ^-1575cm ^-1

¹H-NMR wave spectrum (D ₂O, δ, ppm): 0.86, d, 3H (2-CH ₃); 5.92, dd, J=10.0 and 5.4Hz, 1H (3-H); 5.99, d, J=10.0Hz, 1H (4-H); 5.52, br 1H (5-H); 4.24, m 1H (6-H); 5.34, br, 1H (8-H); 4.06, m, and 1H (β-H), 3.65, m, 1H (δ-H); 1.05, d, 3H (2 '-CH ₃); 0.82, t, 3H (4 '-H ₃).

¹³C-NMR wave spectrum (D ₂O, δ, ppm): 15.3, q (2-CH ₃); 139.5, d (C-3); 129.5, d, (C-4); 138.1, s (C-4a), 127.7, d (C-5); 66.6, d (C-6); 70.1, d (C-8); 182.6s (COO ^-); (72.6d C-β); 73.0, d (C-δ); 182.0, s (C-1 ') 18.8; Q (2 '-CH ₃); 13.7, q (C-4 ').

Positive ion FAB mass spectrum (characteristic ion):

[M+Na] ^-469；[M+H] ⁺447

Negative ion FAB mass spectrum (characteristic ion):

[M-H] ^-445, [M-Na] ^-423, m/z 101[2-methyl-butyric acid-H] ^-

Embodiment 3

In 5 liters of working volume fermentor tanks of laboratory scale, prepare biotransformation medium MU/4 as described in example 1 above, though its 4.5 liters of application of sample at the most, the composition meter of substratum is by 5 liters of calculating.121 ℃ of sterilizations were used the 500ml inoculum inoculation according to embodiment 1 preparation after 45 minutes.By using stir speed (S.S.) to be 300rpm, Ventilation Rate is 50 liters/hour, and making ferments carried out 4 days in 25 ℃.After being added into the closely knit rhzomorph substrate of 5g in the culture, carry out bio-transformation according to embodiment 2.

After finishing this generation conversion, 4.9 liters of meat soups that contain 660 μ g/ml Pravastatins are filtered,, wash isolating mycelium by in 2 * 1 liters of deionized waters, suspending.With 20% sulfuric acid the pH of 5.6 liters of bouillon filtrate (BF)s of blended is transferred to 3.5-3.7, this acid filtrate and 2750ml ethyl acetate stirred 30 minutes then.Subsequently, separate each phase.Water is used 2 * 1375ml ethyl acetate extraction again.The 470ml deionized water is joined in the blended 4740ml acetic acid ethyl ester extract, with 1M sodium hydroxide the pH of the ethyl acetate mixture aqueous solution is transferred to 7.5-8.0 then.Stir after 20 minutes, separate each phase, use 2 * 235ml deionized water extraction acetic acid ethyl ester extract then as mentioned above.Then with the aqueous solution vacuum concentration of blended weakly alkaline 1080ml volume to the 280ml volume.Should the spissated aqueous solution be layered on the chromatography column of filling (highly: ratio=6.5 of straight warp) with 280ml Diaion HP-20 (Mitsubishi Co., Japan) non-ionic resin.On this pillar, adsorb with flow velocity 250-300ml/ hour, use 840ml deionized water wash pillar then.Subsequently, use 800ml 5% in the following order, 1000ml 10%, and 500ml15% and 500ml 20% contains the water elution pillar of acetone.In the process of wash-out, collect the flow point of 50ml, described flow point is analyzed according to the TLC method that provides among the embodiment 2.To contain Pravastatin is the flow point merging of main component, and resulting solution for vacuum concentration is to the 260ml volume.The spissated aqueous solution is chromatography on the pillar of the 260ml volume that contains Diaion HP-20 resin.Behind the absorption Pravastatin, pillar 790ml deionized water wash, then with the part of 260-260ml with the following aqueous acetone solution wash-out that increases acetone content gradually: 2.5%, 5.0%, 7.5%, 10.0%, 12.5%, 15.0% and 20.0%.In the process of column chromatography, collect the flow point of 25ml, analyze the Pravastatin content in the flow point as mentioned above.The handle of identifying by TLC contains the flow point merging of Pravastatin as one-component, and vacuum-evaporation.Subsequently, the 0.3g gac is joined in the spissated aqueous solution (about 30ml), make Pravastatin clarification 30 minutes under the room temperature.From solution, remove gac by filtration method then, with the filtrate freeze-drying.Obtain the Pravastatin of 1.62g lyophilized form like this.

Embodiment 4

With Mortierella maculata n.sp.E-97[NCAIM (P) F001266 that cultivates 10-12 days] slant culture of bacterial strain, prepare spore suspension with aseptic 0.9% sodium chloride solution of 5ml, the 500ml VHIG seed culture medium that will in the 3000ml Erlenmeyer flask, sterilize with this suspension inoculation.

The composition of substratum VHIG:

Glucose 30g

Meat extract 8g

Yeast extract 1g

Tween-80 (polyoxyethylene (20) sorbitan monooleate) 0.5g

Be dissolved in the 1000ml tap water.

PH with substratum before the sterilization transfers to 7.0,121 ℃ of sterilizations 25 minutes.Go up culture cultivation 3 days at rotary shaker (250rpm, 2.5cm amplitude), then with the fermentor tank that contains biotransformation medium PK in the 5 liters of working volumes of inoculum inoculation experiments chamber scale that obtain.

The composition of substratum PK:

Glucose 40g

Peptone 5g

Soyflour 20g

K ₂HPO ₄ 2g

KH ₂PO ₄ 1g

NaNO ₃ 2g

KCl 0.5g

Be dissolved in the 1000ml tap water.

PH with substratum before the sterilization transfers to 7.0.After inoculating, cultivate, add substrate and bio-transformation according to embodiment 2, separate Pravastatin again from this meat soup, wherein the concentration of Pravastatin is 650 μ g/ml during fermentation ends.

Finish fermentation, under continuously stirring, 4.9 liters of pH that contain the meat soup of 650 μ g/ml Pravastatins are transferred to 9.5-10.0, stir after 1 hour, pH is transferred to 3.5-3.7 with 20% sulfuric acid with 2M sodium hydroxide.Subsequently, with 2.45 liters of these acidic solutions of ethyl acetate extraction.Separate each phase, prepare clarifying extract from this emulsive organic phase with centrifuging.According to aforesaid method, meat soup is used 2 * 1.22 liters of ethyl acetate extractions again.Acetic acid ethyl ester extract is merged, add 0.4 liter of deionized water, with 1M sodium hydroxide the pH of mixture is transferred to 8.0-8.5 then.Separate each phase, as mentioned above, with pH8.0-8.52 * 0.2 liter deionized water extraction ethyl acetate phase.Stir down and the pH that blended contains the weak alkaline aqueous solution of Pravastatin is transferred to 3.5-3.7 with 20% sulfuric acid.The acidic solution that is obtained is with 4 * 0.2 liters of ethyl acetate extractions.The blended acetic acid ethyl ester extract is with 2 * 0.2 liters of deionized water wash, then 150% (mole) dibenzylamine (according to the Pravastatin content-calculating of measuring by HPLC) joined in the ethyl acetate solution.Ethyl acetate solution vacuum concentration to 0.2 is risen volume.20% (mole) dibenzylamine is joined in the enriched material of acquisition, sedimentary solution spends the night in 0-5 ℃ of placement again.The Pravastatin dibenzyl amine salt of filtering-depositing will be deposited on the strainer then earlier with cold ethyl acetate washing 1 time, then with normal hexane washing 2 times, at last in 40-50 ℃ of vacuum-drying.Under the room temperature, the raw product (3.9g) that obtains is dissolved in 100ml methyl alcohol, makes this solution clarification with the 0.45g gac then.After this vacuum concentration methyl alcohol filtrate.Externally temperature 62-66 ℃ the time, vaporized residue is dissolved in the 120ml acetone, then solution is cooled to room temperature.Subsequently, proceeding recrystallize under 0-5 ℃ spends the night.The crystal of filtering-depositing washs crystal 2 times with cold acetone earlier on strainer, then with normal hexane washing 2 times.With the Pravastatin dibenzylamine salt suspension of recrystallize in the mixture of 160ml isobutyl acetate and 80ml deionized water.Subsequently, under agitation sodium hydroxide is joined in the suspension with equivalent.Suspension separates each phase after disappearing, and the aqueous solution that contains Pravastatin washs with 2 * 30ml isobutyl acetate.The aqueous solution that obtains is clarified with gac.To contain filter liquor then and be concentrated into about 20ml volume.The aqueous solution application of sample that obtains is to the chromatography column of filling with 0.4 liter of Sephadex LH-20 gel (supplier: Pharmacia, Sweden) (highly: straight through=22).In the chromatography process, deionized water is collected the flow point of 20ml as elutriant.By TLC flow point is analyzed, adopted aforesaid method also those flow points that contain Pravastatin to be analyzed then by HPLC.Merge the flow point and the freeze-drying that contain pure Pravastatin.Obtain the 1.75g Pravastatin like this, the purity of measuring it by HPLC is higher than 99.5%.

Embodiment 5

With Mortierella maculata n.sp.E-97[NCAIM (P) F001266 that cultivates 10-12 days] slant culture and aseptic 0.9% sodium chloride solution of 5ml of bacterial strain prepare spore suspension, then as this suspension inoculation of usefulness 500ml seed culture medium as described in the embodiment 4.In 5 liters of working volume fermentor tanks of laboratory scale, biotransformation medium PC/4 121 ℃ of sterilizations 45 minutes, is inoculated with inoculum then.

The composition of substratum PC/4:

Wort 5.0%

Soyflour 1.0%

Peptone 1.0%

Corn steep liquor 1.0%

MgSO ₄×7H ₂O 0.1％

Be dissolved in the 1000ml tap water.

PH with substratum before the sterilization transfers to 7.0.After inoculating, cultivate and add substrate according to embodiment 2, obtain 5.1 liters and contain the meat soup that concentration is the Pravastatin of 610 μ g/ml.

According to the method that is provided among the embodiment 4, from this meat soup, produce 3.7g Pravastatin dibenzyl amine salt raw product, behind its recrystallize, therefrom obtain 2.9g Pravastatin dibenzyl amine salt.The Pravastatin dibenzylamine salt suspension of this recrystallize in 45ml ethanol, is under agitation added 110% (mole) sodium hydroxide by the ethanolic soln that adds 1M sodium hydroxide then.Continued stirred solution 0.5 hour, and then the 0.3g gac was joined in the solution and restir 0.5 hour.Filtering solution is concentrated into 15ml with filtrate.Under 56-60 ℃, 60ml acetone is joined in the enriched material then.The solution that is obtained is cooled to room temperature, spends the night in+5 ℃ of placements then.Subsequently, with sedimentation and filtration, use 2 * 20ml acetone, 2 * 20ml ethyl acetate and the washing of 2 * 20ml normal hexane then, last vacuum-drying.The rough Pravastatin of the 1.7g that obtains is dissolved in the ethanol, then with gac clarification, crystallization from ethanol-ethyl acetate mixture.Obtain the 1.54g Pravastatin like this, it is identical with the product of embodiment 2.

Embodiment 6

As described in embodiment 4, with Mortierella maculata n.sp.E-97[NCAIM (P) F 001266 that cultivates 7-10 days] slant culture of bacterial strain, the 500ml seed culture medium MI that sterilizes in the inoculation 3000ml Erlenmeyer flask cultivated 3 days on rotary shaker in 28 ℃ then.

The composition of substratum MI:

Glucose 40g

Casein 5g

KCl 0.5g

NaNO ₃ 3g

KH ₂PO ₄ 2g

MgSO ₄×7H ₂O 0.5g

FeSO ₄×7H ₂O 0.01g

Be dissolved in the 1000ml tap water.

PH with substratum before the sterilization transfers to 6.0,121 ℃ of sterilizations 35 minutes.The inoculum that obtains is inoculated among 5 liters of biotransformation medium P12 that sterilize in the fermentor tank.

The composition of substratum P12:

Glucose 10g

Wort 50g

Yeast extract 5g

Corn steep liquor 5g

MgSO ₄×7H ₂O 1g

Tween-80 0.5g

Be dissolved in the 1000ml tap water.

PH with substratum before the sterilization transfers to 7.0, sterilizes 45 minutes for 121 ℃ then.Ferment, add substrate and bio-transformation according to embodiment 2.After finishing bio-transformation, the concentration that following separation generates is the Pravastatin of 620 μ g/ml:

With 2M sodium hydroxide 5.15 liters of pH that contain the meat soup of 620 μ g/ml Pravastatins are transferred to 9.5 values, stirred 1 hour under the room temperature then.Filtered broth, mycelium suspends in 1 * 0.5 water then and washs earlier by suspending in 1 * 2 premium on currency.Merging filtrate transfers to 3.7 with 20% sulfuric acid with pH value of aqueous solution, uses 1.5 liters of ethyl acetate extractions then with 2.5 liters earlier.Acetic acid ethyl ester extract is merged, add the 1.95g dicyclohexyl amine with 2 * 0.5 premium on currency washing back.Under 40 ℃ of decompressions, acetic acid ethyl ester extract is concentrated into 200ml, once more the 0.195g dicyclohexyl amine is joined in the enriched material, then it was stirred 6 hours down in 15 ℃.Sedimentary crystalline substance is filtered, wash with the 15ml ethyl acetate then with 20ml earlier, dry down at 40 ℃.Obtain the 3.51g raw product like this.This raw product behind the recrystallize, obtains 3.05g Pravastatin dicyclohexyl amine salt (fusing point: 162-168 ℃) in acetone-alcohol mixture, be translated into Pravastatin according to embodiment 5.

Embodiment 7

As described in embodiment 2, with Mortierella maculata n.sp.E-97[NCAIM (P) F001266] bacterial strain ferments, adds substrate and bio-transformation.The following Pravastatin that obtains by bio-transformation that from meat soup, separates.

5 liters of culture broth that contain concentration and be 650 μ g/ml Pravastatins are filtered on filter cloth.In 2 liters of 0.1M sodium hydroxide solutions, the fungal hyphae body was stirred 1 hour, filter then.Mix two kinds of filtrates, pH is transferred to 3.5-4.0 with 15% sulfuric acid.Subsequently, this solution is with 2 * 1.8 liters of ethyl acetate extractions.The blended ethyl acetate is used the 800ml water washing mutually.Add the 400ml deionized water then, the pH value of mixture is transferred to 8.0-8.5 with 1M sodium hydroxide.Mixture was stirred 15 minutes, separate each phase then.With 300ml water join ethyl acetate mutually in, and pH transferred to 8.0-8.5.Stir after 15 minutes, separate each phase.Once more 300ml water is joined ethyl acetate mutually in, and pH transferred to 8.0-9.5.Then mixture was stirred 15 minutes.Separate two-phase once more.Mix all waters, and pH is transferred to 3.5-4.0, use 3 * 300ml ethyl acetate extraction then with 15% sulfuric acid.The blended ethyl acetate is used the 150ml water washing mutually, uses anhydrous sodium sulfate drying, and filters.Then 150% (mole) Di-Octyl amine (according to Pravastatin content-calculating) is joined in the acetic acid ethyl ester extract.Ethyl acetate is evaporated to about 1/10 volume, adds acetone till precipitation occurring.Mixture spends the night in+5 ℃ of placements.Filtering-depositing on the G-4 strainer is used earlier the 20ml washing with acetone, then with the washing of 20ml normal hexane, and vacuum-drying under room temperature.The rough Pravastatin Di-Octyl amine of the 3.3g salt that recrystallize obtained from 20ml acetone obtains the pure Pravastatin Di-Octyl amine salt of 2.7g.Fusing point: 143-146 ℃.With the method that provides among the embodiment 5, Pravastatin Di-Octyl amine salt is converted into Pravastatin.

Embodiment 8

By to separate from natural habitat, can be with the exploitation of the Mortierellamaculata n.sp.E-97 bacterial strain hydroxylation ability of closely knit rhzomorph 6 β-hydroxylation, in sudden change selection that goes through hereinafter and the enzyme induction experiment, obtain Mortierella maculata n.sp.E-97/15/13[NCAIM (P) F 001267] mutant strain.

Will be by we isolated M ortierella maculata n.sp.E-97[NCAIM (P) F001266] bacterial strain cultivated 7 days on the MS agar slant culture-medium in 28 ℃.

The composition of nutrient agar MS:

Glucose 4g

Wort 10g

Yeast extract 4g

Agar 20g

In 1000ml distilled water.

Spore is washed out from slant culture with 5ml 0.9% sodium chloride solution, after spore suspension is transferred to sterile petri dish, it was shone 1 minute then with ultraviolet lamp.Subsequently, be that N-methyl-N '-nitro-N-nitrosoguanidine of 2000 μ g/ml joins in the spore suspension with final concentration.Then this suspension is transferred in the 100ml Erlenmeyer flask, and descended to use the speed of 150rpm with its jolting 20 minutes in 28 ℃.Subsequently,, make the spore precipitation, be suspended in then in the 0.9% sodium-chlor sterile solution by centrifugal 10 minutes with the speed of 400rpm.This suspension is coated on the agar plate MU-VB that contains 10 μ g/ml benomyl and 1% defibrinated blood.

The composition of nutrient agar MU-VB:

Glucose 40g

L-asparagine 2g

Peptone 2.5g

Potassium primary phosphate 0.5g

Agar 20g

Be dissolved in the 990ml distilled water; After the sterilization, be this culture medium supplemented 10ml ox blood and 10mgbenomyl.

Agar plate in 28 ℃ cultivate 7 days after, with the bacterium colony of growth by selecting transferred species at random in the test tube that nutrient agar PS is housed.

The composition of nutrient agar PS:

Glucose 40g

Mycoprotein peptone 10g

Agar 15g

Be dissolved in the 1000ml distilled water.

PH value with substratum before the sterilization transfers to 5.6-5.7.Sterilized 20 minutes for 121 ℃.

Slant culture was cultivated 12 days in 28 ℃, as described in embodiment 1, and the Pravastatin productivity of test cultures in shake flat experiment.Select Mortierella maculata n.sp.E-97/15/13 mutant strain by this method, this mutant strain produces the Pravastatin that surpasses 60% transformation efficiency with the sodium salt of the closely knit rhzomorph acid of the 1000 μ g/ml concentration of using.

By containing 100 μ g/ml 8-and taking off-cultivate on the MU-VB nutrient agar of (2-methyl-butyryl) closely knit rhzomorph and/or closely knit rhzomorph, induce the hydroxylase of Mortierella maculata n.sp.E-97/15/13 bacterial strain.After selecting the bacterium colony of growth at random, with their transferred speciess to the MU-VB inclined-plane that contains inductor.Detect the Pravastatin productivity of inclined-plane grown culture according to the method described in the embodiment 1, but following difference is arranged: add closely knit rhzomorph substrate with the amount of 500 μ g/ml from the 4th day of fermentation, added 11 days continuously, add closely knit rhzomorph sodium substrate gradually, closely knit rhzomorph sodium substrate was converted into Pravastatin fully in 12 days.When closely knit rhzomorph sodium substrate carries out the bio-transformation end in 50 shake-flask culture things with 30g, generated the 18.5g Pravastatin by HPLC mensuration.In accordance with the following methods, from the blended fermenting broth, carry out the recovery of Pravastatin.

After finishing fermentation, the pH that will contain 5.5 liters of meat soups of 3360 μ g/ml concentration Pravastatins with 20% sulphuric acid soln transfers to 3.5-3.7.Subsequently, this acidic solution is with 2.75 liters of ethyl acetate extractions.Separate each phase, clarify extract from the preparation of emulsive organic phase by centrifugal.As described previously, extract meat soup again 2 times with 1.37 liters of ethyl acetate.The blended acetic acid ethyl ester extract is with 2 * 1.15 liters of deionized water wash, then 150% (mole) dibenzylamine (according to the Pravastatin content-calculating of measuring by HPLC) joined in the ethyl acetate solution.With the ethyl acetate solution vacuum concentration to about 0.23 liter of volume.Once more 20% (mole) dibenzylamine is joined in the enriched material, precipitation solution is spent the night in 0-5 ℃ of placement.The dibenzyl amine salt of the Pravastatin acid of filtering-depositing washs throw out then by it is suspended in the refrigerative ethyl acetate, be suspended in then in normal hexane to wash 2 times, at last in 40-50 ℃ of vacuum-drying.In 62-65 ℃ of temperature the raw product (22.4g) that obtains is dissolved in 0.67 liter of acetone, makes the solution clarification with the 2.2g gac.After the clarification, acetone filtrate vacuum concentration to 0.56 is risen volume.Under said temperature, will from this enriched material, dissolve once more by sedimentary crystal, then this solution will be cooled to room temperature.Subsequently, continuing recrystallize at 0-5 ℃ spends the night.The crystal of filtering-depositing washs for 2 times by suspending in refrigerative acetone, is suspended in then in the normal hexane and washs 2 times.Dibenzyl amine salt in the Pravastatin acid of 40-50 ℃ of vacuum-drying recrystallize.Be dissolved in 740ml ethyl acetate-ethanol (9: the 1) mixture at 40-44 ℃ of dibenzyl amine salt (14.8g), then 110% (mole) sodium hydroxide joined in this solution of 1M ethanolic soln form the Pravastatin acid that obtains.The precipitation solution that the continuation stirring obtains under the room temperature 0.5 hour precipitates by using or reaching in ice-cooled 1-1.5 hour fully then.Subsequently, filtering-depositing is with 2 * 150ml refrigerative ethyl acetate and the washing of 2 * 150ml normal hexane, at last in 40-50 ℃ of vacuum-drying.The Pravastatin that obtains is dissolved in the ethanol,, from ethanol-ethyl acetate mixture, crystallizes out then with the clarification of 1.0g gac.Obtain the 9.4g Pravastatin like this, its physical constant is corresponding to the data that provide among the embodiment 2.

Though this paper has described some present embodiment preferred of the present invention, but it will be apparent to one skilled in the art that under the situation that does not deviate from the spirit and scope of the present invention and can the embodiment that the present invention describes be made various changes and modifications.Therefore, the present invention only limits to appended claims and the required degree of the applicable rule of law.

Claims (2)

1. one kind is preserved in the state-run agricultural of Budapest, HUN and industrial microorganism preservation center, preserving number are the pure culture of biology of the Mortierella maculata n.sp.E-97/15/13 bacterial strain of NCAIM (P) F001267.

One kind can be with the genus mortierella culture of formula (II) compound 6 β-hydroxylation,

Wherein R represents a kind of basic metal or ammonium ion, described culture mainly is made up of a kind of new bacterial strain Mortierella maculata n.sp.E-97/15/13, described bacterial strain is preserved in state-run agricultural of Budapest, HUN and industrial microorganism preservation center, and preserving number is NCAIM (P) F001267.

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