JP2023506054A - O-ホスホセリン排出タンパク質変異体、並びにそれを用いたo-ホスホセリン、システイン及びその誘導体の生産方法 - Google Patents
O-ホスホセリン排出タンパク質変異体、並びにそれを用いたo-ホスホセリン、システイン及びその誘導体の生産方法 Download PDFInfo
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- phosphoserine
- amino acid
- polypeptide
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Abstract
Description
また、前記微生物は、さらにOPSの細胞内への流入又は分解能力を減少させた微生物であってもよい。
O-ホスホセリン生産菌株におけるO-ホスホセリン(O-phosphoserine,以下「OPS」)の排出活性を増加させるために、OPS排出タンパク質の活性を増加させるべく、OPS排出タンパク質であるYhhS MFS(major facilitator superfamily)トランスポーター(配列番号11)及びそれをコードする遺伝子yhhS(配列番号12)の変異体を作製した。具体的な過程は次の通りである。
2-1.OPS生産株を用いたyhhS453導入菌株の作製及びOPS生産能の評価
実施例1で同定した1種の変異体プラスミドpCL_PrhtB-yhhS453をOPS生産株であるCA07-0012に当該技術分野で通常用いられるエレクトロポレーションにより形質転換した。このようにして、yhhS遺伝子変異体yhhS453を導入したOPS生産菌株であるCA07-0012/pCL_PrhtB-yhhS453を作製し、そのO-ホスホセリン生産能を評価した。
yhhS453の活性を再確認するために、OPS生産能が増加したOPS生産菌株として、OPS生合成経路であるserA(D-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)の活性を強化した菌株CA07-0022/pCL_Prmf-serA*(G336V)-serC(KCCM11103P,特許文献2)を用いた。
染色体上にyhhS453を導入してもOPS排出活性が向上するかを確認するために、微生物の自己プロモーターをtrcプロモーターに置換し、本出願のyhhS453を導入した菌株を作製し、O-ホスホセリンの生産能を評価した。具体的には、Trcプロモーターを大腸菌の染色体上に挿入するために、pSKH130ベクター(配列番号30)を用いた。前記ベクターは、PIタンパク質(pir遺伝子)に依存性を有するR6Kレプリコン(replicon)、SacB(Levansucrase)遺伝子、及びカナマイシン(kanamycin)耐性遺伝子を含んでおり、前記ベクターを用いて1次交差においてR6K及びカナマイシンにより所望の菌株を確保し、その後スクロース(sucrose)を含む培地から抗生剤を除去して菌株を作製した。具体的には、CA07-0022菌株中の自己yhhSをyhhS453に置換するために、pSKH130_yhhS453ベクターを作製した。pSKH130-yhhS453を作製するために、実施例1で確保したpCL_PrhtB-yhhS453を鋳型とし、配列番号20及び21のプライマー対を用いてPCRを行い、yhhS453遺伝子断片を確保した。PCRは、94℃で5分間の変性後、94℃で30秒間の変性、55℃で30秒間のアニーリング、72℃で1分間の重合を30サイクル行い、次いで72℃で5分間の重合反応を行うものとした。増幅された遺伝子断片をEcoRVの制限酵素で処理したpSKH130ベクターとインフュージョンクローニングキット(in-fusion cloning kit,Clontech Laboratories,Inc.)でクローニングし、pSK-yhhS453を確保した。確保したプラスミドをCA7-0022菌株にエレクトロポレーションにより形質転換した。形質転換した菌株は、組換え(交差)によりカナマイシン含有LB固体培地で染色体に導入された菌株を選択し、その後スクロース含有培地で2次組換え(置換)により染色体からプラスミド部分を取り除いた。前記2次組換えが完了した菌株に対して、配列番号22及び23のプライマー対によりPCR及び塩基配列分析を行い、CA07-0022::yhhS453菌株を作製した。
Claims (14)
- 配列番号11のアミノ酸配列のa)241番目に相当する位置のイソロイシン(I)がトレオニン(T)に、246番目に相当する位置のアスパラギン酸(D)がバリン(V)に、330番目に相当する位置のバリン(V)がイソロイシン(I)に置換され、b)88番目に相当する位置のアミノ酸がフェニルアラニンであり、c)207番目に相当する位置のアミノ酸がリシン(K)である配列を有する、O-ホスホセリン(O-phosphoserine,OPS)排出活性を示すポリペプチド。
- 前記ポリペプチドは、配列番号1のアミノ酸配列及びそれと90%以上の配列同一性を有する、請求項1に記載のO-ホスホセリン(O-phosphoserine,OPS)排出活性を示すポリペプチド。
- 請求項1に記載のポリペプチドをコードするポリヌクレオチド。
- 請求項1に記載のポリペプチド、前記ポリペプチドをコードするポリヌクレオチド、及び前記ポリヌクレオチドを含むベクターの少なくとも1つを含むO-ホスホセリン生産微生物。
- 前記微生物は、さらにホスホセリンホスファターゼ(phosphoserine phosphatase,SerB)の活性が内在性活性より弱化した、請求項4に記載の微生物。
- 前記微生物は、さらにホスホグリセリン酸デヒドロゲナーゼ(phosphoglycerate dehydrogenase,SerA)又はホスホセリンアミノトランスフェラーゼ(phosphoserine aminotransferase,SerC)の活性が内在性活性より強化された、請求項4に記載の微生物。
- 前記微生物は、大腸菌(Escherichia coli)である、請求項4に記載の微生物。
- 請求項1に記載のポリペプチド、前記ポリペプチドをコードするポリヌクレオチド、及び前記ポリヌクレオチドを含むベクターの少なくとも1つを含むO-ホスホセリン生産微生物を培地で培養するステップを含む、O-ホスホセリンの生産方法。
- 前記方法は、培養した培地又は微生物からO-ホスホセリンを回収するステップをさらに含む、請求項8に記載のO-ホスホセリンの生産方法。
- a)請求項1に記載のポリペプチド、前記ポリペプチドをコードするポリヌクレオチド、及び前記ポリヌクレオチドを含むベクターの少なくとも1つを含むO-ホスホセリン生産微生物を培地で培養してO-ホスホセリン又はそれを含む培地を生産するステップと、
b)O-ホスホセリンスルフヒドリラーゼ(O-phosphoserine sulfliydrylase,OPSS)又はそれを発現する微生物の存在下で、前記a)ステップで生産されたO-ホスホセリン又はそれを含む培地を硫化物と反応させるステップとを含む、システイン又はその誘導体の生産方法。 - 前記システイン誘導体の生産方法は、前記b)ステップで生成されたシステインをシステイン誘導体に変換するステップをさらに含む、請求項10に記載のシステイン又はその誘導体の生産方法。
- 前記硫化物は、Na2S、NaSH、(NH4)2S、H2S及びNa2S2O3からなる群から選択される少なくとも1つである、請求項10に記載のシステイン又はその誘導体の生産方法。
- 配列番号11のアミノ酸配列のa)241番目に相当する位置のイソロイシン(I)がトレオニン(T)に、246番目に相当する位置のアスパラギン酸(D)がバリン(V)に、330番目に相当する位置のバリン(V)がイソロイシン(I)に置換され、b)88番目に相当する位置のアミノ酸がフェニルアラニンであり、c)207番目に相当する位置のアミノ酸がリシン(K)である配列を有する、O-ホスホセリン排出活性を示すポリペプチド、又は配列番号1のアミノ酸配列を有するポリペプチドのO-ホスホセリン、システイン又はシステイン誘導体の生産のための使用。
- 配列番号11のアミノ酸配列のa)241番目に相当する位置のイソロイシン(I)がトレオニン(T)に、246番目に相当する位置のアスパラギン酸(D)がバリン(V)に、330番目に相当する位置のバリン(V)がイソロイシン(I)に置換され、b)88番目に相当する位置のアミノ酸がフェニルアラニンであり、c)207番目に相当する位置のアミノ酸がリシン(K)である配列を有する、O-ホスホセリン排出活性を示すポリペプチド、又は配列番号1のアミノ酸配列を有するポリペプチドのO-ホスホセリンを微生物から排出するための使用。
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