JP2016533731A - O−スクシニルホモセリンの生産のため微生物及びこれを用いたo−スクシニルホモセリンの生産方法 - Google Patents
O−スクシニルホモセリンの生産のため微生物及びこれを用いたo−スクシニルホモセリンの生産方法 Download PDFInfo
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- JP2016533731A JP2016533731A JP2016526088A JP2016526088A JP2016533731A JP 2016533731 A JP2016533731 A JP 2016533731A JP 2016526088 A JP2016526088 A JP 2016526088A JP 2016526088 A JP2016526088 A JP 2016526088A JP 2016533731 A JP2016533731 A JP 2016533731A
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- Prior art keywords
- homoserine
- strain
- producing
- succinyl
- seq
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 244000005700 microbiome Species 0.000 title claims abstract description 25
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Abstract
Description
metA遺伝子のフィードバック調節の解除及び安定性を確保するための方法の一環として、metX遺伝子(Homoserine O-acetyltransferase)がmetA遺伝子と類似の構造を有しながらもL−メチオニン(L-methonine)に対するフィードバック阻害を受けないことに着目し、クロモバクテリウム・ビオラセウム(Chromobacterium violaceum)由来のmetXが開発されたことがある。
2−1.シデロキシダンス・リトトロピクスES−1由来のmetX遺伝子の合成
選別したシデロキシダンス・リトトロピクスES−1(sli)由来のmetX遺伝子は、NCBIデータベースの参照配列(reference sequence)YP_003522665.1のmetX遺伝子配列(配列番号2)をベースに、大腸菌(Escherichia coli)で発現できるようにコドン最適化(codon optimization)の過程を経て合成した(配列番号3)。
合成した配列番号3の塩基配列をベースに、配列番号4、5のプライマーを用いてPCRを行い、metX遺伝子を増幅した。配列番号5のプライマーは、制限酵素HindIII部位を有している。
配列番号5) 5'-CCC AAGCTT ttaagcagctgattcccaagc-3’
3−1.metB遺伝子欠損
野生型E. coli(K12)W3110菌株からシスタチオニンγ−シンターゼをコードするmetB遺伝子を欠損させた。metB遺伝子欠損のためにFRT−one−step−PCR deletion方法を行った(非特許文献5)。metB遺伝子欠損のために、配列番号6、7のプライマーを用いてpKD3ベクター(非特許文献5)を鋳型としてPCR反応により欠損カセット(deletion cassette)を作製した。
配列番号7) 5'-CGCTGCGCCAGCTCCATACGCGGCACCAGCGTTCGCAACCCACGTAGCAGCATATGAATATCCTCCTTAG-3’
配列番号9) 5'-TACCCCTTGTTTGCAGCCCG-3’
ホモセリンキナーゼをコードする遺伝子であるthrB遺伝子を欠損させることにより、ホモセリンからO−スクシニルホモセリンの合成量を増加させようとした。特に、トレオニン生産菌株を利用する場合、ホモセリンの利用活性が非常に大きいため、この遺伝子の欠損が必ず必要である。前記作製したCC03−0131菌株でthrB遺伝子欠損のためにFRT−one−step−PCR deletion方法を行った。thrB遺伝子欠損のためには、配列番号10、11のプライマーを用い、pKD3ベクターを鋳型としてPCR反応により欠損カセットを作製した。
配列番号11) 5’-GGAGATACCGCTCGCTACCGCGCCGATTTCCGCGACCGCCTGCCGCGCCTCATATGAATATCCTCCTTAG-3’
配列番号13) 5'-ACGCCGAGAGGATCTTCGCAG-3’
E. coli菌株でシデロキシダンス・リトトロピクスES−1由来のmetX遺伝子の基質特異性及び活性を確認するために、E. coli(K12)W3110菌株にmetBとthrB遺伝子を欠損させたCC03−0131−2菌株をベースに、染色体上の本来のmetA遺伝子を欠損させた。metA遺伝子欠損のためにFRT−one−step−PCR deletion方法を行った。metA遺伝子欠損のために、配列番号14、15のプライマーを用い、pKD3ベクターを鋳型としてPCR反応により欠損カセットを作製した。
配列番号15) 5’-CCGTCACAAAGGCAATGCGCTTATCTTTACTGGCAAACAGATATGCATCCCATATGAATATCCTCCTTAG-3’
配列番号17) 5'-TATCTTGCTGCTGCTGAATG-3’
シデロキシダンス・リトトロピクスES−1由来のmetX遺伝子の基質特異性及び活性を確認するために、野生型菌株E. coli(K12)W3110をベースにmetB、thrB及びmetA遺伝子を欠損させた菌株CC03−0132菌株に、前記実施例2で作製したプラスミドpCL−PcysK−metX(sli)を導入した。
4−1.フラスコ培養実験
前記実施例3で作製した菌株に導入されたシデロキシダンス・リトトロピクスES−1由来のmetX遺伝子の基質特異性及び活性を確認するために、三角フラスコ培養を行った。フラスコ培地組成を下記表1に示した。
Claims (7)
- 配列番号1で表されるアミノ酸配列を有し、メチオニンによるフィードバック阻害に対する耐性(feedback resistant)及びホモセリンO−スクシニルトランスフェラ−ゼ(Homoserine Succinyltransferase)活性を有する分離されたポリペプチド。
- 請求項1のポリペプチドをコードする配列番号2または3の塩基配列を有する分離されたポリヌクレオチド。
- 配列番号1で表されるアミノ酸配列を有し、メチオニンによるフィードバック耐性(feedback resistant)及びホモセリンO−スクシニルトランスフェラ−ゼ(Homoserine Succinyltransferase)活性を有するポリペプチドを発現する、O−スクシニルホモセリンを生産するエシェリキア属微生物。
- 前記エシェリキア属微生物は、大腸菌(Escherichia coli)であることを特徴とする、請求項3に記載のO−スクシニルホモセリンを生産するエシェリキア属微生物。
- シスタチオニンγ−シンターゼ(cystathionine gamma synthase)をコードするmetB遺伝子がさらに欠損または弱化されたことを特徴とする、請求項3に記載のエシェリキア属微生物。
- ホモセリンキナーゼ(homoserine kinase)をコードするthrB遺伝子またはホモセリンO−スクシニルトランスフェラ−ゼ(homoserine O-succinyltransferase)をコードするmetA遺伝子がさらに欠損または弱化されたことを特徴とする、請求項3に記載のエシェリキア属微生物。
- (a)請求項3〜6のいずれか一項の微生物を培地で培養する段階;及び
(b)前記微生物または培地からO−スクシニルホモセリンを得る段階を含む、O−スクシニルホモセリンの生産方法。
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PCT/KR2014/009967 WO2015060647A1 (ko) | 2013-10-23 | 2014-10-22 | O-숙시닐호모세린 생산 미생물 및 이를 이용한 o-숙시닐호모세린의 생산방법 |
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