JP6570617B2 - O−ホスホセリン生産微生物及びそれを用いたo−ホスホセリンまたはl−システイン生産方法 - Google Patents
O−ホスホセリン生産微生物及びそれを用いたo−ホスホセリンまたはl−システイン生産方法 Download PDFInfo
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- JP6570617B2 JP6570617B2 JP2017507849A JP2017507849A JP6570617B2 JP 6570617 B2 JP6570617 B2 JP 6570617B2 JP 2017507849 A JP2017507849 A JP 2017507849A JP 2017507849 A JP2017507849 A JP 2017507849A JP 6570617 B2 JP6570617 B2 JP 6570617B2
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- phosphoserine
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Description
本発明において、用語「システイン誘導体」とは、システインの水素原子、または特定の原子団が、他の原子または原子団により置換された化合物を意味する。その例として、システインのアミン基(−NH2)の窒素原子またはチオール基(−SH)の硫黄原子に他の原子または原子団が付着された形態であることができ、その例としてNAC(N−acetylcysteine)、SCMC(S−Carboxymetylcysteine)、BOC−CYS(ME)−OH、(R)−S−(2−アミノ−2−カルボキシエチル)−L−ホモシステイン、(R)−2−アミノ−3−スルホプロピオン酸、D−2−アミノ−4−(エチルチオ)酪酸、3−スルフィノ−L−アラニン、Fmoc−Cys(Boc−methyl)−OH、セレノ−L−システイン、S−(2−チアゾリル)−L−システイン、S−(2−チエニル)−L−システイン、S−(4−トレイル)−L−システインなどがあるが、これらに限定されない。システインは、アセチル化剤(acetylation agent)と反応してNAC(N−アセチルシステイン)で容易に合成することができ、塩基性条件下では、ハロ酢酸(haloacetic acid)と反応させることによりSCMC(S-Carboxymetylcysteine)で合成することができる。前記システイン誘導体は、主に医薬品原料であり、鎮咳薬、咳抑制薬、気管支炎、気管支喘息と咽頭炎などの治療剤として使用される。
OPSの排出に関与する大腸菌の膜タンパク質を同定するために、Escherichia coli K12_W3110(ATCC27325)のゲノムDNAライブラリを用いてスクリーニングを行った。
OPSによる生育の低下を解除させるのに関与するYhhS MFSトランスポーター及びYegB MFSトランスポーターをOPS生産菌株でそれぞれ強化した場合、OPS排出能が向上するかを確認するために、それぞれ遺伝子の過発現ベクターを製作しようとした。また、ホモセリン及びホモセリンラクトントランスポーターであるRhtBをOPS生産菌株で強化した場合、OPS濃度が上昇することを確認したため(特許文献2)、これを陽性対照群(positive control)として用いた。そして、YhhS及びMdtDと同様に、MFS(major facilitator superfamily)に属する大腸菌膜タンパク質マルチ薬物放出トランスポーター(multidrug efflux transporter )EmrD及びYcaD MFSトランスポーターを共に評価した。YhhS MFSトランスポーターをコードする遺伝子yhhS(配列番号3、Accession Numbers:b3473)及びYegB MFSトランスポーターをコードする遺伝子mdtD(配列番号4、Accession Numbers:b2077)断片は、W3110ゲノムDNAを鋳型としてPCRを通じて獲得した。
<実施例3−1:CA07−0012を利用したYhhS MFSトランスポーター及びYegB MFSトランスポーター強化菌株製作、及びOPS生産能の評価>
実施例2で製作された5種のプラスミドをそれぞれOPS生産株であるCA07−0012に導入した菌株を作製し、OPSの生産能を評価した。
また、OPS生合成経路であるSerA(3−ホスホグリセリン酸デヒドロゲナーゼ、D-3-phosphoglycerate dehydrogenase)及びSerC(3−ホスホセリンアミノトランスフェラーゼ、3-phosphoserine aminotransferase)の活性を強化させることによりOPS生産能が増加されたOPS生産菌株であるCA07−0022/pCL−Prmf−serA*(G336V)−(RBS)serC(特許文献3)を用いて前記大腸菌の膜タンパク質遺伝子の効果を把握しようとし、その結果を下記の表4に示した。
また、OPS濃度が対照群に比べて上昇した膜タンパク質YhhS及びMdtDにおいてプロモーター強度を強化した時、排出能が向上するかどうかを確認するために、CA07−0022/pCL−Prmf−serA*(G336V)−(RBS)serCにYhhS及びMdtD遺伝子をさらに導入した。この時、rhtBプロモーター(PrhtB)より強いtrcプロモーター(Ptrc)を使用した。
また、染色体上でYhhS及びMdtDのプロモーターをより強力なプロモーターで変えた場合、排出能が向上するかを確認するために自己プロモーターをcj1プロモーター(特許文献4)で置換された菌株を製作し、O−ホスホセリンの生産能を評価した。Cj1プロモーターを大腸菌の染色体に導入する方法は、一般的に用いられる下記方法で製作した。染色体にYhhS及びMdtDがプロモーターを置換するために製作した組換えベクターをOPS生産菌株であるCA07−0022/pCL−Prmf−serA*(G336V)−(RBS)serC(特許文献2)に形質転換させて、親菌株が有している自己プロモーター配列と前記ベクター上のプロモーター配列とを相同組換えを通じて置換させることにより、染色体内にcj1プロモーター配列を挿入させた。
実施例3においてOPS生産が確認された前記フラスコサンプル中、膜タンパク質を強化させていない陰性対照群(negative control)であるCA07−0022/pCL−Prmf−serA*(G336V)−(RBS)serC、YhhS及びMdtDタンパク質を強化させたサンプルCA07−0022/pCL−Prmf−serA*(G336V)−(RBS)serC−Ptrc−yhhS及びCA07−0022/pCL−Prmf−serA*(G336V)−(RBS)serC−Ptrc−mdtDを用いて培地内に排出されたOPSをすべて除去した後、細胞のみを収集し細胞を破砕した。その後、細胞内のOPS濃度をHPLC(high performance liquid chromatography)機器を用いて測定して、その結果を図1に示した。
Claims (8)
- 配列番号1または2のアミノ酸配列を有するO−ホスホセリン(O-phosphoserine、OPS)の排出活性を示すポリペプチドの活性が内在的活性に比べて強化された、組換えO−ホスホセリン生産微生物であって、エシェリキア属、エルウィニア属、セラチア属、プロビデンシア属、コリネバクテリウム属、又はブレビバクテリウム属に属し、
ホスホセリンホスファターゼ(phosphoserine phosphatase、SerB)の活性が内在的活性に比べて弱化されたか、またはホスホグリセリン酸デヒドロゲナーゼ(phosphoglycerate dehydrogenase、SerA)もしくはホスホセリンアミノトランスフェラーゼ(phosphoserine aminotransferase、SerC)の活性が内在的活性に比べてさらに強化された、微生物。 - O−ホスホセリン(OPS)排出活性を示し、配列番号1または2のアミノ酸配列を有するポリペプチドの活性が内在的活性に比べて強化された、組換えO−ホスホセリン生産微生物を培地で培養する段階、及び
前記組換えO−ホスホセリン生産微生物またはその培地からO−ホスホセリンを分離する段階を含む、O−ホスホセリンの生産方法であって、前記組換え微生物がエシェリキア属、エルウィニア属、セラチア属、プロビデンシア属、コリネバクテリウム属、又はブレビバクテリウム属に属する微生物である、方法。 - 前記O−ホスホセリン生産微生物は、さらにホスホセリンホスファターゼ(phosphoserine phosphatase、SerB)の活性が内在的活性に比べて弱化されたものである、請求項2に記載の生産方法。
- 前記O−ホスホセリン生産微生物は、さらにホスホグリセリン酸デヒドロゲナーゼ(phosphoglycerate dehydrogenase、SerA)またはホスホセリンアミノトランスフェラーゼ(phosphoserine aminotransferase、SerC)の活性が内在的活性に比べて強化されたものである、請求項2に記載の生産方法。
- a)請求項1の組換え微生物を培地で培養してO−ホスホセリン(OPS)を生産する段階、及びb)O−ホスホセリンスルフヒドリラーゼ(O-Phosphoserine sulfhydrylase、OPSS)またはこれを発現する微生物の存在下で、前記a)段階で生産されたO−ホスホセリンまたはこれを含む培地を硫化物と反応させる段階を含む、システインの生産方法。
- 前記硫化物が、Na2S、NaSH、(NH4)2S、H2S及びNa2S2O3からなる群から選択される1つ以上である、請求項5に記載の方法。
- a)請求項1の組換え微生物を培地で培養してO−ホスホセリンを生産する段階、b)O−ホスホセリンスルフヒドリラーゼ(O-Phosphoserine sulfhydrylase、OPSS)またはこれを発現する微生物の存在下で、前記a)段階で生産されたO−ホスホセリンまたはこれを含む培地を硫化物と反応させる段階、及びc)前記b)段階で生産されたシステインをシステイン誘導体に変換する段階を含む、システイン誘導体の生産方法。
- 前記硫化物が、Na2S、NaSH、(NH4)2S、H2S及びNa2S2O3からなる群から選択される1つ以上である、請求項7に記載の方法。
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