JP7009009B2 - 高分子量コポリマーを合成するための遺伝子 - Google Patents
高分子量コポリマーを合成するための遺伝子 Download PDFInfo
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Description
なお、本明細書に記載の実施形態は、本発明の範囲を限定するものではなく、当業者であれば、本発明が目的を実行し、上述した目的及び利点、並びにそれらに固有の目的及び利点を得るためによく適合していることを容易に理解するであろう。
マングローブ土壌メタゲノムからのポリマー合成酵素遺伝子のクローニング
最初に、メタゲノムDNAをMoBio PowerSoil DNA単離キットを用いて直接マングローブ土壌から単離した。
C.necator形質転換体の調製
HindIII-ApaIポリマー合成酵素遺伝子断片を、先に同じ制限酵素で切断したクローニングベクターpCR(登録商標)4-TOPO(登録商標)(米国、Invitrogen)に最初に挿入した。次いで、断片をHindIII及びApaI制限酵素で再び消化し、得られたHindIII-ApaIポリマー合成酵素遺伝子断片を、Cupriavidus属に属する微生物において発現可能な組換えベクターpBBR1MCS-2に挿入し、得られた組換えプラスミドをコンジュゲーション転写法によりCuprividus necator PHB-4(DSM541)(ポリマーの合成能力が欠損した株)に形質転換した。
C.necator形質転換体によるポリマーの合成
C.necator形質転換体を、1ml/Lの微量元素を含有する50mLのミネラル培地(0.25g/L硫酸マグネシウム七水和物、3.32g/Lリン酸水素二ナトリウム、2.8g/Lリン酸二水素カリウム、0.5g/L塩化アンモニウム)に接種し、フラスコ内にて30℃でインキュベートした。50mg/LのカナマイシンをC.necator形質転換体用の培地に加え、微生物を48時間培養した。
出発培養物からの3%接種物(O.D=~4.5)を250mL三角フラスコ中の50mLのMMに移し、30℃、48時間、200rpmでインキュベートした。報告された値は、3回培養の平均値±SDである。
a凍結乾燥細胞におけるPHA含量
3HB:3-ヒドロキシブチラート;3HV:3-ヒドロキシバレレート;5HV:5-ヒドロキシバレレート;4HB:4-ヒドロキシブチラート;3H4MV:3-ヒドロキシ-4-メチルバレレート;3HHx:3-ヒドロキシヘキサノエート
Streptomyces種CFMR7由来のEnoyl-CoAヒドラターゼ遺伝子のクローニング
最初に、ゲノムDNAを単離した。Streptomyces種CFMR7 QIAamp DNAミニキット。
C.necator形質転換体の調製
SwaI-SwaIエノイル-CoAヒドラターゼ遺伝子断片を、以前に構築した([0099])BP-M-CPF4のポリマー合成酵素を有する組換えベクターpBBR1MCS-2に挿入し、得られた組換えプラスミドをコンジュゲーション転写法によりCuprividus necator PHB-4(DSM541)(ポリマーの合成能力が欠損した株)に形質転換した。[0099]の組換えベクター構築物も、エノイル-CoAヒドラターゼの効果を比較するための陰性対照として用いた。
C.necator形質転換体によるポリマーの合成
C.necator形質転換体の各々を、50mLのミネラル培地(4.0g/L NaH2PO4、4.6g/L Na2HPO4、0.45g/L K2SO4、0.54g/L Urea、0.39g/L MgSO4、0.062g/L CaCl2及び1ml/Lの微量元素に接種し、フラスコ内にて30℃でインキュベートした。微量元素溶液は、0.1M塩酸に溶解した15g/L FeSO4・7H2O、2.4g/L MnSO4・H2O、2.4g/L ZnSO4・7H2O及び0.48g/L CuSO4・5H2Oからなるものであった。50mg/LのカナマイシンをC.necator形質転換体用の培地に加え、微生物を48時間培養した。
出発培養物からの3%接種物(O.D=~4.5)を250mL三角フラスコ中の50mLのMMに移し、30℃、48時間、200rpmでインキュベートした。表中にGC及びGPCによる分析により得られた結果を示した。この数値は、3回培養の平均値±SDである。
a凍結乾燥細胞におけるPHA含量
3HB:3-ヒドロキシブチラート;3HHx:3-ヒドロキシヘキサノエート
Claims (10)
- 配列番号1に記載のアミノ酸配列、又は、1つのアミノ酸が置換、欠失若しくは付加された配列番号1に記載のアミノ酸配列を含み、かつポリマー合成酵素活性を有するポリペプチドをコードする単離されたポリヌクレオチド、及び
配列番号3に記載のアミノ酸配列、又は、1つのアミノ酸が置換、欠失若しくは付加された配列番号3に記載のアミノ酸配列を含み、かつヒドラターゼ活性を有するポリペプチドをコードする単離されたポリヌクレオチドを含む組換えベクター。 - 配列番号2に記載のヌクレオチド配列、1つのヌクレオチドが置換された配列番号2に記載のヌクレオチド配列、若しくはその相補配列、又はチミンがウラシルによって置換されているヌクレオチド配列若しくはその相補配列を含み、かつポリマー合成酵素活性を有するポリペプチドをコードする単離されたヌクレオチド、及び
配列番号4に記載のヌクレオチド配列、1つのヌクレオチドが置換された配列番号4に記載のヌクレオチド配列、若しくはその相補配列、又はチミンがウラシルによって置換されているヌクレオチド配列若しくはその相補配列を含み、かつヒドラターゼ活性を有するポリペプチドをコードする単離されたポリヌクレオチドを含む請求項1に記載の組換えベクター。 - プラスミド又はファージである、請求項1又は2に記載の組換えベクター。
- 請求項3に記載の組換えベクターによって形質転換された形質転換体。
- 重合性材料を含む培地で、請求項4に記載の形質転換体を培養する工程と、
前記培養された培地からポリマーを回収する工程と、
を含むポリマーの製造方法。 - 配列番号1に記載のアミノ酸配列、又は、1つのアミノ酸が置換、欠失若しくは付加された配列番号1に記載のアミノ酸配列を含み、かつポリマー合成酵素活性を有するポリペプチドをコードする単離されたポリヌクレオチド、及び
配列番号3に記載のアミノ酸配列、又は、1つのアミノ酸が置換、欠失若しくは付加された配列番号3に記載のアミノ酸配列を含み、かつヒドラターゼ活性を有するポリペプチドをコードする単離されたポリヌクレオチドをゲノムに有する組換え株。 - 配列番号2に記載のヌクレオチド配列、1つのヌクレオチドが置換された配列番号2に記載のヌクレオチド配列、若しくはその相補配列、又はチミンがウラシルによって置換されているヌクレオチド配列若しくはその相補配列を含み、かつポリマー合成酵素活性を有するポリペプチドをコードする単離されたヌクレオチド、及び
配列番号4に記載のヌクレオチド配列、1つのヌクレオチドが置換された配列番号4に記載のヌクレオチド配列、若しくはその相補配列、又はチミンがウラシルによって置換されているヌクレオチド配列若しくはその相補配列を含み、かつヒドラターゼ活性を有するポリペプチドをコードする単離されたポリヌクレオチドをゲノムに有する請求項6に記載の組換え株。 - 重合性材料を含む培地で、請求項6又は7に記載の組換え株を培養する工程と、
前記培養された培地からポリマーを回収する工程と、
を含むポリマーの製造方法。 - 前記ポリマーがポリヒドロキシアルカノエートである、請求項5又は8に記載のポリマーの製造方法。
- 前記培養における炭素源が、粗パーム核油である、請求項5又は8に記載のポリマーの製造方法。
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