JP5210295B2 - カダベリンの生産方法 - Google Patents
カダベリンの生産方法 Download PDFInfo
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- JP5210295B2 JP5210295B2 JP2009502043A JP2009502043A JP5210295B2 JP 5210295 B2 JP5210295 B2 JP 5210295B2 JP 2009502043 A JP2009502043 A JP 2009502043A JP 2009502043 A JP2009502043 A JP 2009502043A JP 5210295 B2 JP5210295 B2 JP 5210295B2
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- Prior art keywords
- gene
- deregulated
- succinyl
- dehydrogenase
- diaminopimelate
- Prior art date
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- 108091006106 transcriptional activators Proteins 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 101150059923 trc gene Proteins 0.000 description 1
- 150000003628 tricarboxylic acids Chemical class 0.000 description 1
- 239000012588 trypsin Substances 0.000 description 1
- OUYCCCASQSFEME-UHFFFAOYSA-N tyrosine Natural products OC(=O)C(N)CC1=CC=C(O)C=C1 OUYCCCASQSFEME-UHFFFAOYSA-N 0.000 description 1
- 239000004474 valine Substances 0.000 description 1
- 108700026220 vif Genes Proteins 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 238000003260 vortexing Methods 0.000 description 1
- 210000005253 yeast cell Anatomy 0.000 description 1
- 239000012138 yeast extract Substances 0.000 description 1
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Description
PCRプライマー、WKJ12/WKJ13とWKJ35/WKJ34を、cadA遺伝子とldcC遺伝子をそれぞれ含むDNA断片を増幅するためのテンプレートとしての大腸菌の染色体DNAと共に使用した。増幅したDNA断片を精製し、cadA用の制限酵素Asp718/NdeIとldcC用の制限酵素XhoI/SpeIで消化し、同じ制限酵素で消化したpClik5aMCSベクターに連結して、pClik5aMCS cadAとpClik5aMCS ldcCをそれぞれ得た。
2. カダベリン生産株の構築
カダベリン生産株を構築するため、コリネバクテリウム・グルタミクム野生型株ATCC13032から、アスパルトキナーゼ遺伝子への点変異T311Iの組み込み、ジアミノピメレートデヒドロゲナーゼ遺伝子の重複およびホスホエノールピルビン酸カルボキシキナーゼ遺伝子の破壊によって誘導したリシン生産体LU11271を、リシンデカルボキシラーゼ遺伝子を含む組換えプラスミドで形質転換した。
組換え株について振盪フラスコ実験を行い、カダベリン生産を試験した。WO2005059139に記載のとおり、リシン生産と同じ培地および同じ条件を用いた。対照のため、宿主株と、pClik5aMCSを含む組換え株とを並行して試験した。これらの株を、CM寒天上で、30℃で一晩前培養した。培養した細胞を、1.5mlの0.9% NaClを含むマイクロチューブに回収し、ボルテックス後、610 nmでの吸光度によって細胞密度を測定した。本培養として、オートクレーブした100 ml三角フラスコに入った、0.5 gのCaCO3を含む10 mlの生産培地に、初期OD値の1.5倍に達するまで懸濁細胞を播種した。本培養は、回転式振盪培養機(Infors AJ118, Bottmingen, Switzerland)上で、200 rpmにおいて、30℃で48〜78時間行った。カダベリンおよびリシンの濃度は、HPLC(Agilent 1100 Series LC system)を用いて測定した。
アセチルカダベリン形成酵素を同定するため、タンパク質精製を行った。コリネバクテリウム・グルタミクム株であるATCC13032、またはCM液中で培養したその誘導体の一部を回収し、洗浄し、50 mM Tris-HCl(pH 7.8)、0.02% Brij 35、タンパク質阻害剤混合液(Complete, Roche)および20% グリセロールからなる0.5容の標準緩衝液中に懸濁した。細胞懸濁液は、Microfluidizer(M-110EH, Microfluidics Co.製)を用いて破壊し、その後Microfiltrater(MF42, Satorius製)を用いて濾過した。
10 mM Tris-HCl(pH 7.8)、0.1 mM DTNB(5,5'-ジチオビス-(2-ニトロ安息香酸))、0.25 mMアセチル-CoA、5 mMカダベリン、酵素溶液
の下で、TNB(チオニトロ安息香酸)の生成に起因する412 nmでの吸光度の増大をモニターすることによって酵素活性を測定した。
同定されたアセチルトランスフェラーゼをコードする遺伝子の染色体破壊のため、マーカーを用いない操作を可能とする組換えプラスミドを、2回の連続的相同組換え事象によって構築した。PCRプライマーのセット(上流用のWKJ203/WKJ205と下流用のWKJ206/WKJ204)を用いて、コリネバクテリウム・グルタミクム染色体DNAから上記遺伝子の上流領域および下流領域を含むDNA断片を増幅し、PCRプライマーWKJ203/WKJ204と共に融合PCR用のテンプレートとして使用して、上記遺伝子の中間領域が除去されている融合断片を作製した。融合PCR産物は、精製し、XhoIとSpeIで消化して、同じ制限酵素で消化したpClikintsacBベクター(コリネバクテリウム・グルタミクムのゲノム領域において配列を統合する(Beckerら(2005), Applied and Environmental Microbiology, 71 (12), 8587-8596頁))中に挿入した。
6. アセチルカダベリン形成およびカダベリン生産性への影響
アセチルトランスフェラーゼ遺伝子破壊の、アセチルカダベリン形成およびカダベリン生産性に対する影響を分析するため、遺伝子破壊した変異体について振盪フラスコ実験を行った。カダベリン生産と同じ培地および同じ条件を用いた(上記参照)。遺伝子破壊した変異体は、アセチルカダベリンが蓄積されなかったことを示した。このことは、同定された上記のアセチルトランスフェラーゼのみが、アセチルカダベリン形成に関与することを示唆する。その結果、アセチルカダベリン形成の排除をもたらす遺伝子破壊によってカダベリン生産性が向上した。
Claims (8)
- 脱調節されたリシンデカルボキシラーゼ遺伝子と、アスパルトキナーゼが遺伝子(i)として脱調節されている場合にはアスパルトキナーゼ以外の少なくとも1つの第2の遺伝子(i)が脱調節されていなければならないことを条件として、アスパルトキナーゼ、アスパラギン酸セミアルデヒドデヒドロゲナーゼ、ジヒドロジピコリン酸シンターゼ、ジヒドロジピコリン酸レダクターゼ、テトラヒドロジピコリン酸スクシニラーゼ、スクシニル−アミノ−ケトピメレートトランスアミナーゼ、スクシニル-ジアミノ-ピメレートデスクシニラーゼ、ジアミノピメレートエピメラーゼ、ジアミノピメレートデヒドロゲナーゼ、アルギニル-tRNAシンテターゼ、ジアミノピメレートデカルボキシラーゼ、ピルビン酸カルボキシラーゼ、ホスホエノールピルビン酸カルボキシラーゼ、グルコース-6-リン酸デヒドロゲナーゼ、トランスケトラーゼ、トランスアルドラーゼ、6-ホスホグルコノラクトナーゼ、フルクトース1,6-ビホスファターゼ、ホモセリンデヒドロゲナーゼ、ホスホエノールピルビン酸カルボキシキナーゼ、スクシニル-CoAシンテターゼ、メチルマロニルCoAムターゼからなるグループ(i)から選択される少なくとも1つの脱調節された遺伝子とを有する組換え微生物を構築し、該微生物を培養することによる、カダベリンの生産方法であって、
微生物がコリネバクテリウム(Corynebacterium)属に属し、
微生物のジアミンアセチルトランスフェラーゼ活性が脱調節されており、ここで脱調節はその活性の低下であり、
リシンデカルボキシラーゼ、アスパルトキナーゼ、アスパラギン酸セミアルデヒドデヒドロゲナーゼ、ジヒドロジピコリン酸シンターゼ、ジヒドロジピコリン酸レダクターゼ、テトラヒドロジピコリン酸スクシニラーゼ、スクシニル−アミノ−ケトピメレートトランスアミナーゼ、スクシニル-ジアミノ-ピメレートデスクシニラーゼ、ジアミノピメレートエピメラーゼ、ジアミノピメレートデヒドロゲナーゼ、アルギニル-tRNAシンテターゼ、ジアミノピメレートデカルボキシラーゼ、ピルビン酸カルボキシラーゼ、ホスホエノールピルビン酸カルボキシラーゼ、グルコース-6-リン酸デヒドロゲナーゼ、トランスケトラーゼ、トランスアルドラーゼ、6-ホスホグルコノラクトナーゼ、フルクトース1,6-ビホスファターゼの遺伝子の脱調節は、その活性の増大であり、
ホモセリンデヒドロゲナーゼ、ホスホエノールピルビン酸カルボキシキナーゼ、スクシニルCoAシンテターゼ、メチルマロニルCoAムターゼの遺伝子の脱調節は、その活性の低下である、方法。 - 微生物がコリネバクテリウム・グルタミクム(Corynebacterium glutamicum)である、請求項1に記載の方法。
- 脱調節されたリシンデカルボキシラーゼが微生物に対して異種である、請求項1に記載の方法。
- 組換え微生物がエシェリキア(Escherichia)属由来のリシンデカルボキシラーゼを有する、請求項1に記載の方法。
- リシンデカルボキシラーゼが、配列番号1もしくは2のポリペプチド配列、または配列番号1もしくは2と少なくとも90%同一の、リシンデカルボキシラーゼ活性を有するポリペプチド配列を含む、請求項1に記載の方法。
- 請求項1に記載のカダベリンの生産および該カダベリンとジカルボン酸との反応を含んでなる、ポリアミドの生産方法。
- 脱調節されたリシンデカルボキシラーゼ遺伝子と、アスパルトキナーゼが遺伝子(i)として脱調節されている場合にはアスパルトキナーゼ以外の少なくとも1つの第2の遺伝子(i)が脱調節されていなければならないことを条件として、アスパルトキナーゼ、アスパラギン酸セミアルデヒドデヒドロゲナーゼ、ジヒドロジピコリン酸シンターゼ、ジヒドロジピコリン酸レダクターゼ、テトラヒドロジピコリン酸スクシニラーゼ、スクシニル−アミノ−ケトピメレートトランスアミナーゼ、スクシニル-ジアミノ-ピメレートデスクシニラーゼ、ジアミノピメレートエピメラーゼ、ジアミノピメレートデヒドロゲナーゼ、アルギニル-tRNAシンテターゼ、ジアミノピメレートデカルボキシラーゼ、ピルビン酸カルボキシラーゼ、ホスホエノールピルビン酸カルボキシラーゼ、グルコース-6-リン酸デヒドロゲナーゼ、トランスケトラーゼ、トランスアルドラーゼ、6-ホスホグルコノラクトナーゼ、フルクトース1,6-ビホスファターゼ、ホモセリンデヒドロゲナーゼ、ホスホエノールピルビン酸カルボキシキナーゼ、スクシニル-CoAシンテターゼ、メチルマロニルCoAムターゼからなるグループ(i)から選択される少なくとも1つの脱調節された遺伝子とを有する組換え微生物であって、
微生物がコリネバクテリウム(Corynebacterium)属に属し、
微生物のジアミンアセチルトランスフェラーゼ活性が脱調節されており、ここで脱調節はその活性の低下であり、
リシンデカルボキシラーゼ、アスパルトキナーゼ、アスパラギン酸セミアルデヒドデヒドロゲナーゼ、ジヒドロジピコリン酸シンターゼ、ジヒドロジピコリン酸レダクターゼ、テトラヒドロジピコリン酸スクシニラーゼ、スクシニル−アミノ−ケトピメレートトランスアミナーゼ、スクシニル-ジアミノ-ピメレートデスクシニラーゼ、ジアミノピメレートエピメラーゼ、ジアミノピメレートデヒドロゲナーゼ、アルギニル-tRNAシンテターゼ、ジアミノピメレートデカルボキシラーゼ、ピルビン酸カルボキシラーゼ、ホスホエノールピルビン酸カルボキシラーゼ、グルコース-6-リン酸デヒドロゲナーゼ、トランスケトラーゼ、トランスアルドラーゼ、6-ホスホグルコノラクトナーゼ、フルクトース1,6-ビホスファターゼの遺伝子の脱調節は、その活性の増大であり、
ホモセリンデヒドロゲナーゼ、ホスホエノールピルビン酸カルボキシキナーゼ、スクシニルCoAシンテターゼ、メチルマロニルCoAムターゼの遺伝子の脱調節は、その活性の低下である、
組換え微生物。 - 脱調節されたリシンデカルボキシラーゼがエシェリキア(Escherichia)属に由来する、請求項7に記載の組換え微生物。
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WO2022244809A1 (ja) | 2021-05-19 | 2022-11-24 | 旭化成株式会社 | ジアミン生産能を有する組換え微生物およびジアミンの製造方法 |
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HUE030521T2 (en) | 2017-05-29 |
JP5745552B2 (ja) | 2015-07-08 |
EP2013353A1 (en) | 2009-01-14 |
CN102732578B (zh) | 2016-02-17 |
CN102732578A (zh) | 2012-10-17 |
KR20090005099A (ko) | 2009-01-12 |
BRPI0709628A2 (pt) | 2011-07-19 |
CN101389765A (zh) | 2009-03-18 |
JP2013146269A (ja) | 2013-08-01 |
WO2007113127A1 (en) | 2007-10-11 |
JP2009531042A (ja) | 2009-09-03 |
CN101389765B (zh) | 2012-08-22 |
US20090246838A1 (en) | 2009-10-01 |
US8741623B2 (en) | 2014-06-03 |
KR101457229B1 (ko) | 2014-11-04 |
ES2592887T3 (es) | 2016-12-02 |
EP2013353B1 (en) | 2016-06-22 |
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