JP2018529308A - 新規プロモーター及びその用途 - Google Patents
新規プロモーター及びその用途 Download PDFInfo
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- JP2018529308A JP2018529308A JP2017550818A JP2017550818A JP2018529308A JP 2018529308 A JP2018529308 A JP 2018529308A JP 2017550818 A JP2017550818 A JP 2017550818A JP 2017550818 A JP2017550818 A JP 2017550818A JP 2018529308 A JP2018529308 A JP 2018529308A
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- microorganism
- promoter
- vector
- target protein
- corynebacterium
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Abstract
Description
の生産菌株として用いられるコリネバクテリウム属微生物において、生産量の増大のための生合成経路上の遺伝子操作及び/又は外部遺伝子導入などの努力が続いてきた(特許文献1)。このようなコリネバクテリウム属微生物で目的遺伝子の過発現を誘導するためには、高効率の遺伝子発現システムが必要である。その中でプロモーターは、遺伝子発現に最も大きく関与する要素であるため、遺伝子発現システムでは、プロモーターの選択が最も重要である。現在までにコリネバクテリウム属微生物で用いることが可能なプロモーターは、大腸菌由来のいくつかのプロモーター(Plac、Ptrc、Ptac)とコリネバクテリウム属微生物由来のいくつかのプロモーター(Psod、Peftu、PgapA)などが用いられてきた。しかし、これらを用いたコリネバクテリウム属微生物の遺伝子発現システムは、ほとんどの大腸菌遺伝子発現システムに比べて低い発現効率を示した。
ロモーターの開発の必要性が依然として要求されているのが実情である。
質をコードする遺伝子を含む、目的タンパク質発現カセットを提供することにある。
産する段階を含む、プシコース製造方法を提供することにある。
80%以上、より具体的には、90%以上、さらに具体的には、95%以上、またさらに具体的には、98%以上、最も具体的には、99%以上の相同性を示すヌクレオチド配列も制限なく含まれてもよい。また、このような相同性を有するヌクレオチド配列であって、プロモーター活性を有するヌクレオチド配列であれば、一部の配列が欠失、変形、置換、又は付加されたヌクレオチド配列も、本発明の範囲に含まれるものと解釈されるべきである。
、同一性(identity)及び類似度(similarity)などのパラメータ(parameter)を直接
整列して決定することができる(例えば、BLAST2.0)。また、ポリヌクレオチド間の相同性は、相同領域間の安定した二本鎖を形成する条件下でポリヌクレオチドの混成化後、一本鎖特異的ヌクレアーゼにより分解して分解された断片の大きさを決定することにより、決定することができる。
をプシコースに転換させる活性を有するプシコース−3−エピマー化酵素を意味する。前記ATPE遺伝子の配列は、米国国立衛生研究所のGenBankのような公知のデータベースを介して、当業者が容易に入手することができる。また、これらに限定されるものではないが、前記酵素は、その例として特許文献2の配列番号1のアミノ酸配列を有するか又はその機能性断片であってもよい。前記「機能性断片」とはアミノ酸配列に一部のアミノ酸の置換、挿入、又は欠失などによる変異を含み、フルクトースフルクトースをプシコースに転換させる活性を有する断片であれば、特に制限されない。
びバクテリオファージを挙げることができる。例えば、ファージベクター又はコスミドベクターとして、pWE15、M13、λBL3、λBL4、λIXII、λASHII、λAPII、λt10、λt11、Charon4A、及びCharon21Aなどを用いることができ、プラスミドベクターとして、pBR系、pUC系、pBluescriptII系、pGEM系、pTZ系、pCL系及びpET系などを用いることができる。本発明で用いることができるベクターは、特に制限されるものではなく、公知の発現ベクターとすることができる。その例として、pECCG117、pDZ、pACYC177、pACYC184、pCL、pUC19、pBR322、pMW118、pCC1BAC、pCES208、pXMJ19ベクターなどを用いることができるが、これらに限定されない。
マーカーを発現する細胞のみが生存するか、又は他の表現形質を示すため、形質転換された細胞を選別することができる。
宿主細胞の染色体内に挿入されて位置したり、染色体外に位置することができる。
化カルシウム(CaCl2)沈殿、微細注入法(microinjection)、ポリエチレングリコール(PEG)法、DEAE−デキストラン法、陽イオンリポソーム法、及び酢酸リチウムDMSO法などが挙げられるが、これらに限定されない。
てもよい。培養物の温度は、通常20℃〜45℃、好ましくは25℃〜40℃であってもよいが、条件に応じて変更可能であり、これに限定されない。
段階を含む、プシコース生産方法を提供する。
に、Pspl1をGFP又はATEP遺伝子と作動可能に連結して組換えベクターを製造し、これをコリネバクテリウム属細菌に形質転換して形質転換菌株を作製した。
コリネバクテリウム属菌株で外来タンパク質を高発現量に発現させることができる強力な合成プロモーターをスクリーニングするために、ライブラリを構築した。詳しくは、コリネバクテリウム・グルタミカム(Corynebacterium glutamicum)、コリネバクテリウム・アンモニアゲネス(Corynebacterium ammoniagenase)及び大腸菌K12(Escherichia
coli K12)のゲノムDNAを用いてDNAシャッフリング技術を介して、より強力に発
現するか、他の発現プロファイルを示すプロモーターライブラリを確保した。
大腸菌K12(Escherichia coli K12)のゲノムDNAをDNaseIを処理して、複数の断片に切った後、プライマーなしでPCR反応を行った。これにより類似なヌクレオチド配列を有しているそれぞれの断片が互いのプライマーとして作用して、ライブラリが作製されることができる。その次に、前記ライブラリをpUC19ベクターに平滑末端接合(blunt-end ligation)方式で導入した。次にKpnI/PstI切断部位を含む配列番
号2及び配列番号3のプライマーを用いてPCRを行い、様々に合成されたプロモーターライブラリを作製した。
実施例1で最終的に確保されたPspl1プロモーターを含有するプラスミドpECCG117−Pspl1−gfp、陽性対照群として、従来公知のプロモーターPcj4(特許文献3)を有するプラスミドpECCG117−Pcj4−gfp、及び陰性対照群としてpECCG117プラスミドを用いて、リポータータンパク質である緑色蛍光タンパク質の発現によるプロモーター活性を比較分析した。
pm)した。培養液から遠心分離(5,000rpm、15分)により菌体を回収し、0
.1%トリス塩酸(pH8.0)緩衝溶液で2回洗浄した後、同緩衝液で610nmの濁度が160ほどになるように懸濁した。懸濁液1.5ml当たり1.25gのガラスビーズ(glass bead)を添加した後、ビーズビーター(bead beater)を用いて、6分間菌体
を破砕した後、遠心分離(15,000rpm、20分)を介して上清液を回収し、ブレッドフォード方法(非特許文献3)によるタンパク質濃度を定量した。同量の菌体抽出物についてLaure Goryなどの方法(非特許文献4)を用いて、488nmで励起
光を照射し、511nm発出光をLS−50B分光光度計(Perkin-Elmer)機器を用いて測定することにより、GFP遺伝子の発現程度を測定した(表1)。
コリネバクテリウムの発現改良プロモーター(以下Pspl1)の機能性を評価するために、1つの例示としてATPE(アグロバクテリウム・ツメファシエンスATCC33970由来のプシコースエピマー化酵素)の発現が増大されたコリネバクテリウム菌株のベクターを作製した。
前記作製されたpFIS−2−ATPEベクターとpFIS−2−ATPE−2ベクターとを電気穿孔法を用いて、ATCC13032菌株に導入してFIS−2−ATPEとFIS−2−ATPE−2菌株を作製した。このうちFIS−2−ATPE−2菌株は韓国種菌協会(KCCM)に3月27日付けで寄託し寄託番号KCCM11678Pを与えられた。前記菌株を実施例1の培地(グルコース20g、硫酸アンモニウム5g、酵母エキス5g、尿素1.5g、KH2PO44g、K2HPO48g、MgSO4・7H2O0.5g、ビオチン150μg、チアミン塩酸塩1.5mg、カルシウムパントテン酸3mg、ニコチンアミド3mg(蒸留水1Lあたり)、pH7.2)を用いて、三角フラス
コで培養した後ATPEの活性を測定した。
l培地に接種した後、これを30℃、200rpmの培養器で24時間培養しており、培養後、遠心分離を介して上清液を除去し、冷たいPBSを用いて得られた菌体を洗浄し、確保されたペレットをEPPS溶液(pH8.0)に20%(w/v)で溶解させた後、1mg/mlのPOESAを添加して室温で1時間反応させた後、遠心分離した。遠心分離して得られたペレットをEPPS溶液(pH8.0)に20%(w/v)で溶解させ、基質であるフルクトース溶液300g/Lを添加して、50℃で3時間反応させた後、熱処理により反応を停止させた。以後、遠心分離を介して上清液を収得しHPLC分析によりプシコース生成量を測定した(図2〜図4)。
Claims (11)
- 配列番号1のヌクレオチド配列を有する、プロモーター活性を有する分離された核酸分子。
- 請求項1に記載のプロモーター活性を有する分離された核酸分子及び目的タンパク質をコードする遺伝子を含む、目的タンパク質発現カセット。
- 請求項1に記載の分離された核酸分子又は請求項2に記載の目的タンパク質発現カセットを含む、組換えベクター。
- 前記目的タンパク質をコードする遺伝子が、ATPE遺伝子である、請求項3に記載の組換えベクター。
- 請求項3又は4に記載のベクターが導入された、組換え微生物。
- 前記微生物が、コリネバクテリウム属微生物である、請求項5に記載の組換え微生物。
- 前記コリネバクテリウム属微生物が、コリネバクテリウム・グルタミカム又はコリネバクテリウム・アンモニアゲネスである、請求項6に記載の組換え微生物。
- 前記微生物が、エシェリキア属微生物である、請求項5に記載の組換え微生物。
- 前記エシェリキア属微生物が、大腸菌である、請求項8に記載の組換え微生物。
- (a)請求項5に記載の組換え微生物を培地で培養して目的タンパク質を生産する段階、及び
(b)前記微生物又は培地から生産された目的タンパク質を回収する段階を含む、目的タンパク質を製造する方法。 - (a)請求項4に記載のベクターが導入された微生物を培養する段階、及び
(b)前記培養した微生物をフルクトースと反応させてプシコース(psicose)を生産
する段階を含む、プシコース生産方法。
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EP (1) | EP3279327B1 (ja) |
JP (1) | JP6511160B2 (ja) |
KR (1) | KR101677368B1 (ja) |
CN (1) | CN107810269B (ja) |
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KR102016050B1 (ko) * | 2018-03-20 | 2019-08-29 | 씨제이제일제당 주식회사 | 신규한 프로모터 및 이의 용도 |
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JP2011510625A (ja) * | 2008-01-28 | 2011-04-07 | シージェイ チェイルジェダン コーポレイション | 改良されたプロモーターおよびこれを用いたl−リシンの生産方法 |
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KR100620092B1 (ko) * | 2004-12-16 | 2006-09-08 | 씨제이 주식회사 | 코리네박테리움 속 세포로부터 유래된 신규한 프로모터서열, 그를 포함하는 발현 카세트 및 벡터, 상기 벡터를포함하는 숙주 세포 및 그를 이용하여 유전자를 발현하는방법 |
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KR100789274B1 (ko) | 2007-01-15 | 2008-01-02 | 씨제이 주식회사 | 코리네박테리움 글루타미쿰에서 유래한 신규한 프로모터핵산 분자, 그 프로모터를 포함하는 재조합 벡터, 그재조합 벡터를 포함하는 숙주 세포 및 그 숙주 세포를이용하여 유전자를 발현하는 방법 |
KR20110035805A (ko) | 2009-09-30 | 2011-04-06 | 씨제이제일제당 (주) | 사이코스-에피머화 효소의 고정화 및 이를 이용한 사이코스의 제조방법 |
KR101203856B1 (ko) * | 2011-08-24 | 2012-11-21 | 씨제이제일제당 (주) | 열 안정성이 향상된 사이코스 에피머화 효소 변이체 및 이를 이용한 사이코스의 연속적 생산 |
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KR20140140215A (ko) | 2013-05-28 | 2014-12-09 | 경상대학교산학협력단 | 사이코스 3-에피머라제 효소를 코딩하는 폴리뉴클레오티드를 포함하는 코리네박테리움 및 이를 이용한 사이코스의 생산 방법 |
WO2015032761A1 (en) * | 2013-09-03 | 2015-03-12 | Roquette Freres | Improved variant of d-psicose 3-epimerase and uses thereof |
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CN107810269A (zh) | 2018-03-16 |
KR101677368B1 (ko) | 2016-11-18 |
PL3279327T3 (pl) | 2021-07-05 |
HUE053676T2 (hu) | 2021-07-28 |
EP3279327A4 (en) | 2018-10-24 |
ES2860698T3 (es) | 2021-10-05 |
KR20160119331A (ko) | 2016-10-13 |
US20180094268A1 (en) | 2018-04-05 |
US10501745B2 (en) | 2019-12-10 |
JP6511160B2 (ja) | 2019-05-15 |
WO2016159536A1 (ko) | 2016-10-06 |
CN107810269B (zh) | 2021-06-01 |
EP3279327A1 (en) | 2018-02-07 |
EP3279327B1 (en) | 2021-01-06 |
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