JP2021185830A - 没食子酸合成酵素 - Google Patents
没食子酸合成酵素 Download PDFInfo
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- JP2021185830A JP2021185830A JP2020094648A JP2020094648A JP2021185830A JP 2021185830 A JP2021185830 A JP 2021185830A JP 2020094648 A JP2020094648 A JP 2020094648A JP 2020094648 A JP2020094648 A JP 2020094648A JP 2021185830 A JP2021185830 A JP 2021185830A
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- polypeptide
- gallic acid
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Classifications
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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Abstract
Description
また本発明は、前記ポリペプチドをコードするポリヌクレオチドを提供する。
また本発明は、前記ポリヌクレオチドを含有するベクターを提供する。
また本発明は、前記ポリヌクレオチド又はベクターを含有する形質転換体を提供する。
また本発明は、前記ポリペプチドによりプロトカテク酸を没食子酸に変換することを含む、没食子酸の製造方法を提供する。
〔2〕好ましくは、配列番号2の208位に相当する位置にVal、及び397位に相当する位置にPheを有する、〔1〕記載のポリペプチド。
〔3〕〔1〕又は〔2〕記載のポリペプチドをコードするポリヌクレオチド。
〔4〕〔3〕記載のポリヌクレオチドを含有するベクター。
〔5〕〔3〕記載のポリヌクレオチドを含有するDNA断片。
〔6〕好ましくはDNA発現カセットである、〔5〕記載のDNA断片。
〔7〕〔3〕記載のポリヌクレオチド、〔4〕記載のベクター、あるいは〔5〕又は〔6〕記載のDNA断片を含有する、形質転換体。
〔8〕好ましくはエシェリヒア属又はコリネバクテリウム属に属する細菌である、〔7〕記載の形質転換体。
〔9〕好ましくは、前記形質転換体がプロトカテク酸の産生能を有する、〔7〕又は〔8〕記載の形質転換体。
〔10〕〔1〕又は〔2〕記載のポリペプチドによりプロトカテク酸を没食子酸に変換することを含む、没食子酸の製造方法。
〔11〕好ましくは、前記プロトカテク酸を含有する培地で〔7〕又は〔8〕記載の形質転換体を培養することを含む、〔10〕記載の方法。
〔12〕好ましくは、〔7〕又は〔8〕記載の形質転換体を培養すること含み、該形質転換体がプロトカテク酸の産生能を有する、〔10〕記載の方法。
1)没食子酸合成酵素Cg145をコードする遺伝子の調製
特許文献2には、コリネバクテリウム・グルタミカムATCC13032株のパラヒドロキシ安息香酸水酸化酵素(Genbank Accession No.:NP_600305.1)のアミノ酸配列に対して200位のLeuをValへと置換し、385位のTyrをPheに置換した変異酵素(特許文献2に配列番号22として開示される)が、プロトカテク酸から没食子酸への変換活性が高いことが開示されている。以下の実施例では、該変異酵素をCg145と称し、そのアミノ酸配列を配列番号1として開示する。コリネバクテリウム・グルタミカムATCC13032株のゲノムDNAから、パラヒドロキシ安息香酸水酸化酵素(Genbank Accession No.:NP_600305.1)をコードするDNAをPCRにて増幅してサブクローニングした。得られたDNAにPCRにより上記のアミノ酸置換を導入して、配列番号1のポリペプチドをコードする配列番号5のDNAを調製した。
Genbankデータベースより、コリネバクテリウム・アンモニアゲネス、コリネバクテリウム・カルナエ及びコリネバクテリウム・エフィシェンス由来の4−ヒドロキシ安息香酸−3−モノオキシゲナーゼのアミノ酸配列(それぞれ、WP_040354425.1、WP_015650893.1、及びWP_006769907.1)を取得した。各アミノ酸配列に対して、Cg145と同様に、配列番号1の200位に相当する位置のLeuをValに、385位に相当する位置のTyrをPheに置換したアミノ酸配列を設計した。すなわち、WP_040354425.1のアミノ酸配列の208位LeuをValに、397位TyrをPheに置換したアミノ酸配列(配列番号2)を設計した。同様に、WP_015650893.1から配列番号3を、WP_006769907.1から配列番号4を設計した。以下の実施例では、配列番号2、3及び4で示されるポリペプチドをそれぞれCa145、Cc145、及びCe145と称する。配列番号2、3及び4のポリペプチドをコードするDNA(それぞれ配列番号6、7及び8)をGenScript社に依頼して人工的に合成した。
上記1)及び2)で調製したDNAを、それぞれpET21−a(+)プラスミド(MERCK社)に導入した。pET21−a(+)を鋳型にプライマーHis−pET21a−F及びpET21a−R(表1)を用いたPCRにより、pET21−a(+)ベクター断片を増幅した。Cg145をコードするDNA(配列番号5)を導入したプラスミドを鋳型に、プライマーpET−Cg145−F及びpET−Cg145−R(表1)を用いたPCRにより、Cg145遺伝子断片を増幅した。PCR用酵素はPrimeSTAR Max DNA Polymerase(TaKaRa社)を用いた。pET21−a(+)ベクター断片とCg145遺伝子断片をIn−Fusion HD cloning kit(clontech社)にて連結し、pET21−Cg145を得た。
上記3)で得られたプラスミドをECOS Competent E.coli BL21(DE3)に形質転換した。アンピシリンを含むLB液体培養液2mLにそれぞれの形質転換体を接種し、37℃で一晩培養した。続いてこの培養液1mLを、アンピシリンを含むOvernight Express Instant LB Medium(Merck社)液体培養液10mLに接種し、250rpm、37℃で24時間培養した。培養終了後、4℃、3000rpmで10分間遠心を行い、菌体を回収した。xTractor buffer kit(TaKaRa社)を用いて菌体を破砕し、続いて4℃、14500rpmで5分間遠心し、上清を回収した。得られた上清を、没食子酸合成酵素を含む酵素溶液として用いた。TaKaRa Bradford Protein Assay Kit(TaKaRa社)を用いて、該酵素溶液のタンパク質濃度を定量した。
100μLの基質溶液(100mM Tris−HCl(pH7.5)溶液60μLと、20mM NADH溶液20μLと、20mMのプロトカテク酸溶液20μLの混合液)に、適宜希釈した実施例1で得た酵素溶液を100μL添加し、室温で1時間静置した。反応液10μLをサンプリングし、190μLの37mM硫酸と混合することで反応を停止させた。この溶液の没食子酸生成量を参考例1の方法に従って定量した。タンパク質濃度当たりの没食子酸生成量から、各没食子酸合成酵素の活性を測定した。Cg145の活性を100としたときの各没食子酸合成酵素の相対活性を表2に示した。公知の酵素Cg145と比較して、Ca145は、没食子酸変換活性が18%高かった。
HPLCにより没食子酸を定量した。HPLC装置は、Chromaster(日立ハイテクサイエンス社)を用いた。分析カラムは、L−カラム ODS(4.6mm I.D.×150mm、×化学物質評価研究機構)を用いた。溶離液Aに0.1Mリン酸二水素カリウムを含む0.1%リン酸溶液、溶離液Bに70%メタノールを用い、流速1.0mL/分、カラム温度40℃の条件でのグラジエント溶出により没食子酸を分離した。没食子酸の検出には、UV検出器(検出波長210nm)を用いた。標準試料(没食子酸、関東化学社、製品番号40205)を用いて濃度検量線を作成し、濃度検量線に基づいて没食子酸の定量を行った。HPLC分析に供した実施例2の反応溶液及び標準試料は、37mM硫酸にて適宜希釈した後、AcroPrep 96−well Filter Plates(0.2μm GHP膜、ポール社)を用いて不溶物の除去を行なった。
Claims (8)
- 配列番号2のアミノ酸配列又は当該配列と少なくとも90%の同一性を有するアミノ酸配列からなり、プロトカテク酸を没食子酸へと変換する機能を有するポリペプチド。
- 請求項1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2記載のポリヌクレオチドを含有するベクター。
- 請求項2記載のポリヌクレオチドを含有するDNA発現カセット。
- 請求項2記載のポリヌクレオチド、請求項3記載のベクター、又は請求項3記載のDNA発現カセットを含有する、形質転換体。
- エシェリヒア属又はコリネバクテリウム属に属する細菌である、請求項5記載の形質転換体。
- 請求項1記載のポリペプチドによりプロトカテク酸を没食子酸に変換することを含む、没食子酸の製造方法。
- 請求項5又は6記載の形質転換体を培養することを含み、該形質転換体がプロトカテク酸の産生能を有する、請求項7記載の方法。
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