JP2008263999A - 植物由来のポリアミン代謝関連酵素遺伝子群 - Google Patents
植物由来のポリアミン代謝関連酵素遺伝子群 Download PDFInfo
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- JP2008263999A JP2008263999A JP2008161244A JP2008161244A JP2008263999A JP 2008263999 A JP2008263999 A JP 2008263999A JP 2008161244 A JP2008161244 A JP 2008161244A JP 2008161244 A JP2008161244 A JP 2008161244A JP 2008263999 A JP2008263999 A JP 2008263999A
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Images
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- Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
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Abstract
【解決手段】低温ストレス遭遇時に発現量が変化する植物由来のポリアミン代謝関連酵素遺伝子を含むプラスミドで形質転換されたことを特徴とする植物。
【選択図】図1
Description
Plant cell physiol., 38(10), 156-1166, 1997 Mol. Gen. Genet., 224, 431-436, 1990 Plant Physiol., 103, 829-834, 1993 plant physiol., 111, 1077-1083, 1996 Plant Mol. Biol., 28, 997-1009, 1995 Biocem. J., 314, 241-248, 1996 Plant Mol. Biol., 26, 327-338, 1994 Plant Physiol., 107, 1461-1462, 1995 Plant cell Physiol., 39(1), 73-79, 1998 Plant Science, 122, 111-117, 1997 Plant Science, 126, 1-10, 1997 Japan Jour. Crop Sci., 50(3), 411-412, 1981
2. スペルミジン合成酵素をコードする遺伝子である請求項1記載の植物由来のポリア
ミン代謝関連酵素遺伝子。
3. S−アデノシルメチオニン脱炭酸酵素をコードする遺伝子である請求項1記載の植
物由来のポリアミン代謝関連酵素遺伝子。
4. アルギニン脱炭酸酵素をコードする遺伝子である請求項1記載の植物由来のポリア
ミン代謝関連酵素遺伝子。
5. 配列番号1、配列番号3、配列番号5および配列番号7のいずれかに記載される塩
基配列を含有する請求項1記載の植物由来のポリアミン代謝関連酵素遺伝子。
6. 配列番号2、配列番号4、配列番号6および配列番号8のいずれかに記載されるア
ミノ酸配列をコードする請求項1記載の植物由来のポリアミン代謝関連酵素遺伝子。
7. 植物が双子葉植物である請求項1〜6のいずれかに記載の植物由来のポリアミン代謝関連酵素遺伝子。
8. 植物がウリ科植物である請求項1〜6のいずれかに記載の植物由来のポリアミン代
謝関連酵素遺伝子。
9. 植物がクロダネカボチャ植物である請求項1〜6のいずれかに記載の植物由来のポ
リアミン代謝関連酵素遺伝子。
10. 請求項1記載の植物由来のポリアミン代謝関連酵素遺伝子を部分的に置換もしく
は削除するかまたは他の遺伝子を挿入もしくは付加した遺伝子であって、請求項1記載の植物由来のポリアミン代謝関連酵素遺伝子と同様の作用効果を有する遺伝子。
11. 請求項5記載の植物由来のポリアミン代謝関連酵素遺伝子を部分的に置換もしく
は削除するかまたは他の遺伝子を挿入もしくは付加した遺伝子であって、請求項5記載の植物由来のポリアミン代謝関連酵素遺伝子と同様の作用効果を有する遺伝子。
12. 請求項1記載の植物由来のポリアミン代謝関連酵素遺伝子とストリンジェントな
条件下でハイブリダイズし得ることを特徴とする遺伝子。
13. 請求項5記載の植物由来のポリアミン代謝関連酵素遺伝子とストリンジェントな
条件下でハイブリダイズし得ることを特徴とする遺伝子。
14. 請求項1記載の植物由来のポリアミン代謝関連酵素遺伝子に対するアンチセンス
DNA。
15. 請求項5記載の植物由来のポリアミン代謝関連酵素遺伝子に対するアンチセンス
DNA。
16. 請求項1記載の植物由来のポリアミン代謝関連酵素遺伝子に対するアンチセンス
RNA。
17. 請求項5記載の植物由来のポリアミン代謝関連酵素遺伝子に対するアンチセンス
RNA。
18. 請求項1記載の植物由来のポリアミン代謝関連酵素遺伝子含むことを特徴とする
組換えプラスミド。
19. 請求項2〜4のいずれかに記載の植物由来のポリアミン代謝関連酵素遺伝子含む
ことを特徴とする組換えプラスミド。
20. 請求項5または6に記載の植物由来のポリアミン代謝関連酵素遺伝子含むことを
特徴とする組換えプラスミド。
21. 請求項10または11に記載の植物由来のポリアミン代謝関連酵素遺伝子含むこ
とを特徴とする組換えプラスミド。
22. 請求項18記載の組換えプラスミドを含むことを特徴とする形質転換体。
23. 請求項19記載の組換えプラスミドを含むことを特徴とする形質転換体。
24. 請求項20記載の組換えプラスミドを含むことを特徴とする形質転換体。
25. 請求項21記載の組換えプラスミドを含むことを特徴とする形質転換体。
26. 低温ストレス遭遇時に発現量が変化する植物由来のポリアミン代謝関連酵素遺伝
子を含むプラスミドで形質転換されたことを特徴とする微生物。
27. 形質転換された微生物が大腸菌もしくはアグロバクテリウム(Agrobacterium)属細菌である請求項26記載の形質転換された微生物。
28. 低温ストレス遭遇時に発現量が変化する植物由来のポリアミン代謝関連酵素遺伝
子を含むプラスミドで形質転換されたことを特徴とする植物。
29. 形質転換された植物がシロイヌナズナである請求項28記載の形質転換された植
物。
1.PCR法によるポリアミン代謝関連酵素遺伝子断片の取得(1)低温ストレス誘導PCR用cDNAライブラリーの作製昼18℃/夜14℃・3日間の低温処理を行ったクロダネカボチャ(Cucurbita ficifolia Bouche)の根組織から常法に従い、ポリ(A)+R
NAを抽出する。単離したポリ(A)+RNAから市販のMarathon cDNA Amplification Kit(クローンテック社製)等を用いてPCR用に使用するcDNAライブラリーを作製することができる。単離したポリ(A)+RNAを鋳型として、3’末端に2つのdegenerate nucleotide positionを持つ修飾lock-docking オリゴ(dT)プライマーと逆転写酵素を用いて1本鎖cDNAを合成し、ポリメラーゼ反応によって2本鎖化したcDNAを得る。該2本鎖cDNAをT4DNAポリメラーゼにより末端を平滑化し、Marathon cDNAアダプターをライゲーション反応により結合させ、アダプター結合二本鎖cDNAライブラリーを作製する。
RACE法等により完全長の遺伝子を得ることができる。
実施例1:キュウリとクロダネカボチャの根のポリアミン含量の測定(1)供試材料の調製根において低温ストレス抵抗性の高いクロダネカボチャ(Cucurbita ficifolia Bouche)と低温ストレス抵抗性の低いキュウリ‘四葉’をガラス室で播種し、子葉展開時に市販の床土(サンサン床土;タキイ種苗社製)を詰めた鉢に移植した。第1本葉展開時に人工気象室(気温昼26℃/夜20℃、相対湿度 昼70%/夜85%、光強度480μM/m2s、15時間日長)内に置いた。2台の栽培槽(1/2倍ホーグランド液120L、液温23℃)に9株ずつ定植した。
(2)低温処理定植4日後に、株ごとに生体重を測定して植え戻したのち、1台の栽培槽の液温を14℃に下げた。
(3)サンプリングサンプリングは低温処理後、3日ごとに3株ずつ採取し、茎葉と根の生体重を測定した。同時にポリアミン定量のために根5gを調製し、分析まで−80℃に凍結保存した。
N NaCl/0.1Mリン酸ナトリウム緩衝液(pH8.0)、水、1N塩酸を順次流
してカラムを洗浄し、ポリアミン以外のアミノ酸や有機物を除去した。6N塩酸をカラムに加え、液が出なくなるまで流出し、ポリアミンを回収した。溶出液を40℃で減圧乾固し、これに5%過塩素酸を加えポリアミンを溶解した。プトレシン、スペルミジン、スペルミンのポリアミン量の定量はベンゾイル化した後、UV検出器を接続した高速液体クロマトグラフィー(HPLC)を用いて内部標準法で分析した。HPLCカラムはInertsil
ODS-2(4.6×250mm:GLサイエンス社製)を使用し、58%メタノールに1%酢酸を含んだ溶離液を用いた。
(2)低温処理PCR用cDNAライブラリーの作製cDNAライブラリーの作製はMarathon cDNA Amplification Kit(クローンテック製)を使用した。(1)で得られたクロダネカボチャの根由来のポリ(A)+RNAを鋳型として3’末端に2つのdegenerate nucleotide position を持つ修飾lock-docking オリゴ(dT)プライマーと逆転写酵素を用い、GublerとHoffmanらの方法(Gene, 25, 263-269 (1983))に従い2本鎖cDNAを合成した。得られたcDNAの両末端にMarathon cDNAアダプター(T4 DNAリガーゼにより2本鎖cDNAの両末端へ結合しやすくなるように5’末端をリン酸化したもの)を連結した。得られたアダプター結合のcDNAをクロダネカボチャ根由来のPCR用cDNAライブラリーとした。
SPDSプライマーI(配列番号9)
5'-GTTTTGGATGGAGTGATTCA-3'SPDSプライマーII(配列番号10)
5'-GTGAATCTCAGCGTTGTA-3'SAMDCプライマーIII(配列番号11)
5'−TATGTGCTGTCTGAGTCGAGC-3'SAMDCプライマーIV(配列番号12)
5'-GCTAAACCCATCTTCAGGGGT-3'ADCプライマーV(配列番号13)
5'-GGGCT(T/G)GGA(G/A)T(G/C)GACTA(C/T)-3'(ミックスプライマー)
ADCプライマーVI(配列番号14)
5'-(T/C)CC(A/G)TC(A/G)CTGTC(G/A)CA(G/C)GT-3'(ミックスプライマー)
(6)PCR産物の確認と回収検出された増幅バンドを確認し、カミソリの刃を用いてアガロースゲルから切り出した。切り出したゲルを1.5mlのマイクロチューブに移し、QIAEXII Gel Extraction Kit(QIAGEN社製)を用いてゲルからDNA断片を単離精製を行った。回収したDNA断片をpGEMTクローニングベクター(Promega社製)にサブクローニングし、大腸菌に形質転換後、常法に従ってプラスミドDNAを調製した。
(7)塩基配列決定得られたプラスミドの挿入配列の塩基配列決定をダイデオキシ法(Messing, Methods in Enzymol., 101, 20-78, 1983)により行った。SPDS遺伝子については3種類の遺伝子、SAMDC遺伝子については1種類の遺伝子、ADC遺伝子については2種類の遺伝子が単離された。
(8)ホモロジー検索これらの遺伝子の塩基配列を既知遺伝子塩基配列のデータベースとホモロジーサーチを行うと3種類のSPDS遺伝子は既知の植物由来のSPDS遺伝子と70%の相同性を示した。1種類のSAMDC遺伝子については既知の植物由来のSAMDC遺伝子と70%以上の相同性を示した。2種類のADC遺伝子については既知の植物由来のADC遺伝子と67%以上の相同性を示した。
Claims (7)
- 以下の(a)又は(b)のDNAを含む単離された植物由来のスペルミジン合成酵素(SPDS)遺伝子:
(a) 配列番号1の塩基配列からなるDNA;
(b) 配列番号2に記載されるアミノ酸配列をコードするDNA。 - 以下の(a)又は(b)のDNAを含む単離された植物由来のS−アデノシルメチオニン脱炭酸酵素(SAMDC)遺伝子:
(a)配列番号7の塩基配列からなるDNA;
(b)配列番号8に記載されるアミノ酸配列をコードするDNA。 - 請求項1又は2記載の遺伝子を含むことを特徴とする組換えプラスミド。
- 請求項3記載の組換えプラスミドで形質転換されたことを特徴とする形質転換体。
- 請求項3記載の組換えプラスミドで形質転換されたことを特徴とする植物。
- 以下の工程(1)〜(3)を含むことを特徴とする、配列番号7の塩基配列から成るDNA又は配列番号8のアミノ酸配列をコードするDNAを含むクロダネカボチャ由来のSAMDC遺伝子を生産する方法:
(1) クロダネカボチャ(Cucurbita ficifolia Bouche)を低温処理する工程;
(2) 工程(1)で処理したクロダネカボチャからmRNAを抽出し、cDNAライブラリーを作成する工程;
(3) 工程(2)で作成したライブラリーからSMADCのcDNAを分離する工程。 - 工程(2)において、クロダネカボチャの根からmRNAを抽出する、請求項6に記載の方法。
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