JP2008504048A - L−メチオニン生産菌株及び前記菌株を用いたl−メチオニンの生産方法 - Google Patents
L−メチオニン生産菌株及び前記菌株を用いたl−メチオニンの生産方法 Download PDFInfo
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- JP2008504048A JP2008504048A JP2007519114A JP2007519114A JP2008504048A JP 2008504048 A JP2008504048 A JP 2008504048A JP 2007519114 A JP2007519114 A JP 2007519114A JP 2007519114 A JP2007519114 A JP 2007519114A JP 2008504048 A JP2008504048 A JP 2008504048A
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- methionine
- strain
- threonine
- pse
- metb
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Abstract
Description
本発明は、L−メチオニンの生産に係り、具体的には、L−スレオニン生産菌株でL−メチオニンの生合成に関与するタンパク質を過発現させ、L−メチオニン生産菌株を製造する方法、この方法で製造された菌株、及びこの菌株を用いてL−メチオニンを生産する方法に関する。
メチオニンは、生体内の必須アミノ酸の一種であって、飼料及び食品添加剤として広く用いられるうえ、薬液及び医薬品の合成原料などとしても用いられる。メチオニンは、例えばコリン(レシチン)やクレアチンなどの化合物の前駆体として作用し、システインとタウリンの合成原料としても使われる。また、メチオニンは、硫黄を提供する役割も果たす。S−アデノシル−メチオニンは、L−メチオニンに由来し、生体内でメチル基を提供する役割を果たし、脳の各種神経伝達物質(neurotransmitter)の合成に関与している。メチオニン及び/又はS−アデノシル−L−メチオニン(SAM)は、生体内で肝と動脈の脂肪蓄積を抑制し、憂鬱、炎症、肝疾患及び筋肉痛を緩和するなどの様々な役割を果たす。
本発明の目的は、スレオニンデヒドラターゼ、O−サクシニルホモセリンリアーゼ、シスタチオニンベータリアーゼ、5,10−メチレンテトラヒドロホレートレダクターゼ、及びセリンヒドロキシメチルトランスフェラーゼの中から選択された2個〜5個のタンパク質を発現する組み換えベクターでL−スレオニン生産菌株を形質転換させ、高収率でL−メチオニンを生産するL−メチオニン生産菌株を製造する方法を提供することにある。
図1は本発明の詳細図である。
一つの様態として、本発明は、スレオニンデヒドラターゼ、O−サクシニルホモセリンリアーゼ、シスタチオニンベータリアーゼ、5,10−メチレンテトラヒドロホレートレダクターゼ及びセリンヒドロキシメチルトランスフェラーゼの中から選択された2個〜5個のタンパク質を発現する組み換えベクターでL−スレオニン生産菌株を形質転換させることを特徴とする、L−メチオニン生産菌株を製造する方法を提供する。
O−サクシニルホモセリンリアーゼは、下記反応式に示すように、O−サクシニル−L−ホモセリンからシスタチオニンを合成する活性、及び2−オキソブタノエート(2−ケト酪酸塩、2−オキソ酪酸、α−オキソ酪酸、α−ケト酪酸塩、α−ケト酪酸、2−オキソ−酪酸塩、2−ケト−酪酸塩、2−ケト酪酸)からO−サクシニル−L−ホモセリンを合成する活性を有し(Clausen T, Huber R, Prade L, Wahl MC, Messerschmidt A, EMBO J. 1998 Dec 1; 17(23): 6827-38)、このような活性を有する遺伝子は、metB(Martel A, Bouthier de la Tour C, Le Goffic F (1987), Biochem Biophys Tes Commun 1987; 147(2); 565-71)などがある。
2−オキソブタノエート + サクシネート + NH3 ⇔ O−サクシニル−L−ホモセリン + H2O
シスタチオニンベータリアーゼは、下記反応式に示したように、O−サクシニルホモセリンリアーゼによって合成されたシスタチオニンをホモシステインに代謝する活性を有し、このような活性を有する遺伝子は、metC(Dwivedi CM, Ragin RC, Uren JR (1982). Biochemistry 1982; 21(13); 3064-9. PMID: 7049234)などがある。
前述したような活性を有するタンパク質をコードする遺伝子は、Escherichia coliにクローニングされており、文献(Blattner et. al., Science 277: 1453-1462 (1997))に開示されたE.coliのゲノム配列から得ることができる(受託番号AAC75876)。また、前記遺伝子配列は、米国生物工学情報センター(NCBI)及び日本DNAデータバンク(DDBJ)などのデータベースからも得ることができる。
L−セリン + THF ⇔ 5,10−メチル−THF + グリシン + H2O
前述したような活性を持つタンパク質をコードする遺伝子は、Escherichia coliにクローニングされており、文献(Blattner et. al., Science 277: 1453-1462 (1997))に開示されたE.coliのゲノム配列から得ることができる(受託番号AAC75876)。また、前記遺伝子配列は、米国生物工学情報センター(NCBI)及び日本DNAデータバンク(DDBJ)などのデータベースからも得ることができる。
メチオニン非要求性のスレオニン生産菌株Escherichia coli CJM002は、Escherichia coli MF001の名称でKCCM(Korean Culture Center of Microorganism、韓国ソウル市西大門区弘済1洞361−221ユリムビル)に2004年4月9日付けで第KCCM−10568号で寄託した。
1−1)人工突然変異によるメチオニン要求性の解除
人工的な変異菌株であるTF4076(KFCC10718、韓国特許公告第92−8365号)は、メチオニンに対して要求性を有する菌株である。TF4076のメチオニン要求性を解除するために、TF4076菌株に対してNTG(1-Methyl-3-Nitro-1-Nitrosoguanidine)を用いた人工突然変異実験を行った。TF4076菌株をLB液体培地で一晩培養した後、新しいLB液体培地に移して6時間培養した。培養した培養液を遠心分離して菌体を得て食塩水に2回再懸濁し、さらに、遠心分離によって得られた菌体をシトレート緩衝液で再懸濁した後、濃度400μg/mlのNTGを添加し、その後30分間培養した。培養によって得られた突然変異株を遠心分離して菌体を分離し、分離された菌体を食塩水で2回再懸濁し、M9最小寒天培地(Na2HPO412.8g/L、KH2PO43g/L、NaCl0.5g/L、NH4Cl1g/L、20%グルコース10ml/L、1M CaCl20.1ml/L、1M MgSO42ml/L)で培養して生長するメチオニン非要求性株を選別した。図2はメチオニン要求性が解除された菌株を示す図である。このようにメチオニン要求性が解除されたスレオニン生産菌株をCJM002と命名した。
人工的な変異菌株であるTF4076は、メチオニンに対して要求性を有する菌株である。TF4076のメチオニン要求性を解除するために、野性型のメチオニン生合成遺伝子とTF4076菌株のメチオニン生合成遺伝子間のDNA塩基配列を比較し、これらのうち野生型遺伝子DNAと大きい差を示すTF4076の遺伝子であるglyA、metF遺伝子を野性型の遺伝子で置換した。その結果、glyA、metFの2つの遺伝子を野生型の遺伝子で置換したTF4076菌株はメチオニン要求性が解除されたことを確認した。メチオニン要求性の解除の際に使用されたプラスミドpSE glyA−metFの製作については、実施例3で詳細に後述する。図2はメチオニン要求性が解除された菌株を示す図である。
本実施例では、E.coli(Escherichia coli)内のスレオニンデヒドラターゼ、O−サクシニルホモセリンリアーゼ、シスタチオニンベータリアーゼ、5,10−メチレンテトラヒドロホレートレダクターゼ、セリンヒドロキシメチルトランスフェラーゼをコードする遺伝子tdcB、ilvA、metB、metC、metF、glyA遺伝子をtrcプロモータで交替し、これを含むベクターを製造した。
本実施例では、E.coli内のスレオニンデヒドラターゼ、O−サクシニルホモセリンリアーゼ、シスタチオニンベータリアーゼ、セリンヒドロキシメチルトランスフェラーゼ、5,10−メチレンテトラヒドロホレートレダクターゼを同時に過発現させるために、前記のtdcB遺伝子とmetB遺伝子、tdcB遺伝子とmetBC遺伝子、ilvA遺伝子とmetB遺伝子、ilvA遺伝子とmetBC遺伝子、glyA遺伝子とmetF遺伝子をオペロン構造で製作し、これを含有したベクターを製作し、製作されたベクターをE.coli宿主細胞に形質転換した後、スレオニンデヒドラターゼとO−サクシニルホモセリンリアーゼ、スレオニンデヒドラターゼとO−サクシニルホモセリンリアーゼとシスタチオニンベータリアーゼ、5,10−メチレンテトラヒドロホレートレダクターゼとセリンヒドロキシメチルトランスフェラーゼを同時に過発現するプラスミドを製作した。
前記製作されたtdcB−metBオペロンと、メチオニン生合成過程でメチルリサイクリングに関与するglyA−metFオペロンとを2つのプラスミドによって生産菌株内で同時に発現させるために、pSE380プラスミドとは異なる組み換え起源を含有したベクターであるpCL1920にtdcB−metBオペロンをクローニングしようとした。
実施例3で製作された組み換えプラスミドpSE tdcB−metB、pSE tdcB−metBC、pSE ilvA−metB、pSE ilvA−metBC、pSE glyA−metFを、メチオニン要求性の解除されたスレオニン生産菌株であるCJM002に電気穿孔法を用いて形質転換させ、形質転換された菌株をカルベニシリン(50mg/L)入り固体培地に塗抹して37℃で一晩培養してコロニーを得た。
実施例3、4で製作された組み換えプラスミドpSE glyA−metF、pCL tdcB−metBを、メチオニン要求性の解除されたスレオニン生産菌株であるCJM002に電気穿孔法を用いて形質転換させ、形質転換された菌株をカルベニシリン(50mg/L)及びスペクチノマイシン(100mg/L)入り固体培地に塗抹して37℃で一晩培養してコロニーを得た。
実施例5、6で示したように、抗生剤のカルベニシリン、カルベニシリンとスペクチノマイシンが含有された固体培地に塗抹して選別した各菌株に対するコロニー30株ずつを選抜し、表2に示したメチオニン力価培地を用いて三角フラスコでメチオニン生産性を比較した。
本発明によって製造されたL−メチオニン生産菌株を用いてL−メチオニンを高収率で生産することにより、飼料及び食品添加剤、医薬用及び医薬品の原料などの多様な分野に広く使用できる。
Claims (9)
- L−スレオニン生産菌株を、スレオニンデヒドラターゼ、O−サクシニルホモセリンリアーゼ、シスタチオニンベータリアーゼ、5,10−メチレンテトラヒドロホレートレダクターゼ及びセリンヒドロキシメチルトランスフェラーゼの中から選択された2個〜5個のタンパク質を発現する組み換えベクターで形質転換させることを特徴とする、L−メチオニン生産菌株を製造する方法。
- O−サクシニルホモセリンリアーゼと、シスタチオニンベータリアーゼ及びスレオニンデヒドラターゼの中から選択されたいずれか一つ又は2つとを発現する組み換えベクターでL−スレオニン生産菌株を形質転換させることを特徴とする、請求項1に記載の方法。
- 5,10−メチレンテトラヒドロホレートレダクターゼ及びセリンヒドロキシメチルトランスフェラーゼを発現する組み換えベクターでL−スレオニン生産菌株を形質転換させることを特徴とする、請求項1に記載の方法。
- L−スレオニン生産菌株を、O−サクシニルホモセリンリアーゼとシスタチオニンベータリアーゼ及びスレオニンデヒドラターゼの中から選択されたいずれか一つ又は2つとを発現する組み換えベクター、及び5,10−メチレンテトラヒドロホレートレダクターゼとセリンヒドロキシメチルトランスフェラーゼを発現する組み換えベクターで共同−形質転換させることを特徴とする、請求項1に記載の方法。
- L−スレオニン生産菌株がL−メチオニン非要求性であることを特徴とする、請求項1〜4のいずれか1項に記載の方法。
- L−メチオニン非要求性のL−スレオニン生産菌株がEscherichia coli MF001(KCCM−10568)であることを特徴とする、請求項5に記載の方法。
- 請求項1〜4のいずれか1項に記載の方法で製造されたL−メチオニン生産菌株。
- L−メチオニン生産Escherichia coli MF001(KCCM−10568)菌株。
- 請求項7に記載のL−メチオニン生産菌株を培養することを特徴とする、L−メチオニンを生産する方法。
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PCT/KR2005/001849 WO2006001616A1 (en) | 2004-06-29 | 2005-06-16 | Methionine producting microorganism and method of producing l-methionine using the microorganism |
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JP2004129666A (ja) * | 2002-10-11 | 2004-04-30 | Cj Corp | 染色体上のfadR遺伝子がノックアウトされたL−トレオニン生成変異微生物及びこれを用いたL−トレオニンの製造方法 |
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JP2014522642A (ja) * | 2011-06-29 | 2014-09-08 | メタボリック エクスプローラー | グルコース取り込みが増大されたメチオニン生産用微生物 |
JP2015519917A (ja) * | 2012-06-18 | 2015-07-16 | メタボリック エクスプローラー | メチオニンの発酵生産のための組換え微生物 |
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KR20060000774A (ko) | 2006-01-06 |
US7790424B2 (en) | 2010-09-07 |
US20080194030A1 (en) | 2008-08-14 |
EP1765979A1 (en) | 2007-03-28 |
EP1765979A4 (en) | 2007-09-19 |
KR100651220B1 (ko) | 2006-11-29 |
WO2006001616A1 (en) | 2006-01-05 |
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