CN107056922A - 一种具有降血糖作用的pacap多肽类似物的制备方法 - Google Patents
一种具有降血糖作用的pacap多肽类似物的制备方法 Download PDFInfo
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Abstract
本发明公开了一种具有降血糖作用的PACAP多肽类似物的制备方法。其是解决现有PACAP天然结构稳定性差的问题。其先是根据PACAP基因以及对基因中重要位点的分析,设计出既具有降糖活性,又能延长半衰期的PACAP类似物,采用全合成的方法获得该种类似物的基因,再通过扩增克隆入表达载体进行原核表达,获得了PACAP多肽类似物。本发明采用原核表达的方法获取PACAP多肽类似物的原核表达产物,其价格低廉,易于操作,降低生产成本;所获得的PACAP多肽类似物稳定性好,同时具有降糖作用,可用于后期产品加工利用。
Description
技术领域
本发明属于基因工程技术领域,特别涉及一种具有降血糖作用的PACAP多肽类似物的制备方法。
背景技术
糖尿病是人体营养代谢障碍导致的内分泌疾病,以持续高血糖为其基本生化特征,因胰岛素在靶细胞内不能发挥正常生理作用,以及胰岛素供给不足,使蛋白质、脂肪和单糖转化失调,导致患者的水、电解质代写紊乱的全身性疾病。分为Ⅰ型糖尿病和Ⅱ型糖尿病。Ⅱ型糖尿病是最常见的一类,多发于成年人。目前,区别于之前完全使用药物治疗的单一方式,2015年,采用药物和保健复合治疗的糖尿病患者人数比2012年增加了一倍,2015年的中国糖尿病保健品市场比2012年增加了3倍多。
垂体腺苷酸环化酶激活肽(Pitui tary Adenylate Cyclase Activiting Poly-peptide PACAP)是Miy ata等于1989年在寻找新的下丘脑促激素时从羊下丘脑发现的神经肽,因其对大鼠垂体细胞腺苷酸环化酶(AC)的高激活作用而得名,包括PACAP38和PACAP27两种,分别由38和27个氨基酸组成,后者的氨基酸顺序与PACAP38的N末端1~27个氨基酸残基完全相同。此两种多肽广泛分布于许多动物的下丘脑、中枢神经系统、周围神经系统以及非神经组织内肝脏、肾脏、胰腺、呼吸系统和消化系统等组织或系统中,其中肾上腺含量最高,并具有多种生物活性。垂体腺苷酸环化酶激活肽(PACAP)及其受体在这些组织或系统中,通过Ca2+、Na+、腺苷酸环化酶或磷酸肌醇等作用通路,PACAP发挥神经递质/调质、更发挥着神经营养因子等生物学功能。PACAP不仅是一种新的下丘脑促垂体激素,还是一种新的神经递质和神经调质,PACAP通过作用于PACAP受体,激活腺苷酸环化酶,进而引起初细胞内cAMP水平的增高。此外,它在某些类型细胞的旁分泌和自分泌调节中也发挥作用。近年来有研究表明,PACAP能够通过促进胰岛素分泌,刺激胰岛β细胞增生、阻止胰岛β细胞凋亡、抑制胰高血糖素的释放、抑制胃肠蠕动和胃液分泌、延迟胃排空、产生饱胀感和食欲下降等多重途径来控制血糖。但是,PACAP自身稳定性差,造成体内半衰期短。
发明内容
为了克服现有PACAP天然结构稳定性差存在的体内半衰期短的不足,本发明提供一种步骤合理、易于操作的具有降血糖作用的PACAP多肽类似物的制备方法,该方法通过点突变获得一种PACAP类似物,以达到与PACAP类似的辅助降血糖功能。
本发明解决其技术问题所采用的技术方案为:一种具有降血糖作用的PACAP多肽类似物的制备方法,其特征在于:其经过下列工艺步骤:
(1)、基因设计与合成
全合成点突变后的PACAP类似物基因,全长为84bp;其两端分别引入BamHⅠ和EcoRⅠ酶切位点;其中,
上述类似物基因序列如下:
5’-cactcagacgctgttttcactgacaactacactcgactccgaaagcagatggcagtaaagaagtacctcaactcaatcctaaac-3’;
(2)、酶切
将步骤(1)中合成得到的PACAP类似物基因和PGEX-6P-1载体分别采用BamHⅠ和EcoRⅠ进行双酶切,酶切温度为37℃,作用2~4h;
(3)、连接
将步骤(2)中得到的酶切片段与载体采用PROMEG公司的回收试剂盒回收后,16℃连接过夜;
(4)、转化
将步骤(3)得到的连接产物转化大肠杆菌XL1-Blue,挑取单克隆并测序;
(5)、原核表达
将步骤(4)中得到的测序正确的克隆转化大肠杆菌BL21(DE3),挑取菌落,接种体积为10ml LB液体培养基,37℃振荡培养8~12h;将10ml菌液加入到500ml LB液体培养基中,37℃振荡培养8~12h;将500ml菌液接种至50~80L发酵罐中,跟踪菌体生长指标,待OD600≈0.4~0.6,向其中加入IPTG至终浓度为0.2~0.4mM,继续振荡培养6h;开罐取菌液,12000g离心30~60s;再用发酵液体积10%~20%的、浓度为1%的SDS溶液进行重悬,混匀,冰上超声破碎,12000g离心30~60s,取上清液,即得PACAP多肽类似物的原核表达粗产物;
(6)、凝胶过滤
将步骤(5)中得到的PACAP多肽类似物的原核表达粗产物进行凝胶过滤层析,收集蛋白,即得PACAP多肽类似物的原核表达产物。
本发明先是根据PACAP基因以及对基因中重要位点的分析,设计出既具有降糖活性,又能延长半衰期的PACAP类似物,采用全合成的方法获得该种类似物的基因,通过扩增克隆入表达载体进行原核表达,获得了PACAP多肽类似物。本发明采用基因合成的方法,免去了基因突变的可能性,为后续步骤提供了前提;其所采用了PGEX-6P-1载体,因为pGEX载体带有一个tac起动子,可作诱导表达用,可以适用于任何大肠杆菌,可以用温和的洗脱条件从亲和介质上洗脱下来,最大限度地减少对抗活性的损伤;其所采用BL21菌种,用于高效表达克隆。本发明采用原核表达的方法获取PACAP多肽类似物的原核表达产物,因原核表达技术成熟,价格低廉,易于操作,降低生产成本。本发明获得的PACAP多肽类似物稳定性好,同时也具有降糖作用,可用于后期加工利用,其具有广阔的市场前景。
具体实施方式
下面结合实施例对本发明作进一步说明。
实施例1
一种具有降血糖作用的PACAP多肽类似物的制备方法,其经过下列工艺步骤:
(1)、基因设计与合成
全合成点突变后的PACAP类似物基因,全长为84bp;其两端分别引入BamHⅠ和EcoRⅠ酶切位点;其中,
上述类似物基因序列如下:
5’-cactcagacgctgttttcactgacaactacactcgactccgaaagcagatggcagtaaagaagtacctcaactcaatcctaaac-3’;
(2)、酶切
将步骤(1)中合成得到的PACAP类似物基因和PGEX-6P-1载体分别采用BamHⅠ和EcoRⅠ进行双酶切,酶切温度为37℃,作用3h;
(3)、连接
将步骤(2)中得到的酶切片段与载体采用PROMEG公司的回收试剂盒回收后,16℃连接过夜;
(4)、转化
将步骤(3)得到的连接产物转化大肠杆菌XL1-Blue,挑取单克隆并测序;
(5)、原核表达
将步骤(4)中得到的测序正确的克隆转化大肠杆菌BL21(DE3),挑取菌落,接种体积为10ml LB液体培养基,37℃振荡培养10h;将10ml菌液加入到500ml LB液体培养基中,37℃振荡培养10h;将500ml菌液接种至60L发酵罐中,跟踪菌体生长指标,待OD600≈0.5,向其中加入IPTG至终浓度为0.3mM,继续振荡培养6h;开罐取菌液,12000g离心45s;再用发酵液体积15%的、浓度为1%的SDS溶液进行重悬,混匀,冰上超声破碎,12000g离心45s,取上清液,即得PACAP多肽类似物的原核表达粗产物;
(6)、凝胶过滤
将步骤(5)中得到的PACAP多肽类似物的原核表达粗产物进行凝胶过滤层析,收集蛋白,即得PACAP多肽类似物的原核表达产物。
本实施例采用原核表达的方法获取PACAP多肽类似物的原核表达产物,因原核表达技术成熟,价格低廉,易于操作,降低生产成本。本发明获得的PACAP多肽类似物稳定性好,同时也具有降糖作用,可用于后期加工利用,其具有广阔的市场前景。
实施例2
一种具有降血糖作用的PACAP多肽类似物的制备方法,其特征在于:其经过下列工艺步骤:
(1)、基因设计与合成
全合成点突变后的PACAP类似物基因,全长为84bp;其两端分别引入BamHⅠ和EcoRⅠ酶切位点;其中,
上述类似物基因序列如下:
5’-cactcagacgctgttttcactgacaactacactcgactccgaaagcagatggcagtaaagaagtacctcaactcaatcctaaac-3’;
(2)、酶切
将步骤(1)中合成得到的PACAP类似物基因和PGEX-6P-1载体分别采用BamHⅠ和EcoRⅠ进行双酶切,酶切温度为37℃,作用4h;
(3)、连接
将步骤(2)中得到的酶切片段与载体采用PROMEG公司的回收试剂盒回收后,16℃连接过夜;
(4)、转化
将步骤(3)得到的连接产物转化大肠杆菌XL1-Blue,挑取单克隆并测序;
(5)、原核表达
将步骤(4)中得到的测序正确的克隆转化大肠杆菌BL21(DE3),挑取菌落,接种体积为10ml LB液体培养基,37℃振荡培养12h;将10ml菌液加入到500ml LB液体培养基中,37℃振荡培养12h;将500ml菌液接种至80L发酵罐中,跟踪菌体生长指标,待OD600≈0.6,向其中加入IPTG至终浓度为0.4mM,继续振荡培养6h;开罐取菌液,12000g离心60s;再用发酵液体积20%的、浓度为1%的SDS溶液进行重悬,混匀,冰上超声破碎,12000g离心60s,取上清液,即得PACAP多肽类似物的原核表达粗产物;
(6)、凝胶过滤
将步骤(5)中得到的PACAP多肽类似物的原核表达粗产物进行凝胶过滤层析,收集蛋白,即得PACAP多肽类似物的原核表达产物。
本实施采用原核表达的方法获取PACAP多肽类似物的原核表达产物,技术成熟,价格低廉,易于操作,降低生产成本。本发明获得的PACAP多肽类似物稳定性好,同时也具有降糖作用。
实施例3
一种具有降血糖作用的PACAP多肽类似物的制备方法,其特征在于:其经过下列工艺步骤:
(1)、基因设计与合成
全合成点突变后的PACAP类似物基因,全长为84bp;其两端分别引入BamHⅠ和EcoRⅠ酶切位点;其中,
上述类似物基因序列如下:
5’-cactcagacgctgttttcactgacaactacactcgactccgaaagcagatggcagtaaagaagtacctcaactcaatcctaaac-3’;
(2)、酶切
将步骤(1)中合成得到的PACAP类似物基因和PGEX-6P-1载体分别采用BamHⅠ和EcoRⅠ进行双酶切,酶切温度为37℃,作用2h;
(3)、连接
将步骤(2)中得到的酶切片段与载体采用PROMEG公司的回收试剂盒回收后,16℃连接过夜;
(4)、转化
将步骤(3)得到的连接产物转化大肠杆菌XL1-Blue,挑取单克隆并测序;
(5)、原核表达
将步骤(4)中得到的测序正确的克隆转化大肠杆菌BL21(DE3),挑取菌落,接种体积为10ml LB液体培养基,37℃振荡培养8h;将10ml菌液加入到500ml LB液体培养基中,37℃振荡培养8h;将500ml菌液接种至50L发酵罐中,跟踪菌体生长指标,待OD600≈0.4,向其中加入IPTG至终浓度为0.2mM,继续振荡培养6h;开罐取菌液,12000g离心30s;再用发酵液体积10%的、浓度为1%的SDS溶液进行重悬,混匀,冰上超声破碎,12000g离心30s,取上清液,即得PACAP多肽类似物的原核表达粗产物;
(6)、凝胶过滤
将步骤(5)中得到的PACAP多肽类似物的原核表达粗产物进行凝胶过滤层析,收集蛋白,即得PACAP多肽类似物的原核表达产物。
本实施采用原核表达的方法获取PACAP多肽类似物的原核表达产物,因原核表达技术成熟,价格低廉,易于操作,降低生产成本。本发明获得的PACAP多肽类似物稳定性好,同时也具有降糖作用。
本发明利用实施例1获得的PACAP多肽类似物对糖尿病小鼠血糖的影响作用进行测定,其具体结果如下:
| 组别 | N | 实验前 | 实验后 |
| 正常对照组 | 10 | 3.72±1.21 | 3.69±0.90 |
| 糖尿病对照组 | 10 | 25.72±5.11 | 23.25±3.32 |
| 实验组 | 10 | 25.44±5.61 | 18.05±3.27# |
试验结果表明,本发明所得多肽类似物对实验性糖尿病小鼠具有显著的降糖作用。#与实验前相比P<0.01。
Claims (1)
1.一种具有降血糖作用的PACAP多肽类似物的制备方法,其特征在于:其经过下列工艺步骤:
(1)、基因设计与合成
全合成点突变后的PACAP类似物基因,全长为84bp;其两端分别引入BamHⅠ和EcoRⅠ酶切位点;其中,
上述类似物基因序列如下:
5’-cactcagacgctgttttcactgacaactacactcgactccgaaagcagatggcagtaaagaagtacctcaactcaatcctaaac-3’;
(2)、酶切
将步骤(1)中合成得到的PACAP类似物基因和PGEX-6P-1载体分别采用BamHⅠ和EcoRⅠ进行双酶切,酶切温度为37℃,作用2~4h;
(3)、连接
将步骤(2)中得到的酶切片段与载体采用PROMEG公司的回收试剂盒回收后,16℃连接过夜;
(4)、转化
将步骤(3)得到的连接产物转化大肠杆菌XL1-Blue,挑取单克隆并测序;
(5)、原核表达
将步骤(4)中得到的测序正确的克隆转化大肠杆菌BL21(DE3),挑取菌落,接种体积为10ml LB液体培养基,37℃振荡培养8~12h;将10ml菌液加入到500ml LB液体培养基中,37℃振荡培养8~12h;将500ml菌液接种至50~80L发酵罐中,跟踪菌体生长指标,待OD600≈0.4~0.6,向其中加入IPTG至终浓度为0.2~0.4mM,继续振荡培养6h;开罐取菌液,12000g离心30~60s;再用发酵液体积10%~20%的、浓度为1%的SDS溶液进行重悬,混匀,冰上超声破碎,12000g离心30~60s,取上清液,即得PACAP多肽类似物的原核表达粗产物;
(6)、凝胶过滤
将步骤(5)中得到的PACAP多肽类似物的原核表达粗产物进行凝胶过滤层析,收集蛋白,即得PACAP多肽类似物的原核表达产物。
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