JP2022109339A - オルニチン脱炭酸酵素変異型及びそれを用いたプトレシンの生産方法 - Google Patents
オルニチン脱炭酸酵素変異型及びそれを用いたプトレシンの生産方法 Download PDFInfo
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- JP2022109339A JP2022109339A JP2019233558A JP2019233558A JP2022109339A JP 2022109339 A JP2022109339 A JP 2022109339A JP 2019233558 A JP2019233558 A JP 2019233558A JP 2019233558 A JP2019233558 A JP 2019233558A JP 2022109339 A JP2022109339 A JP 2022109339A
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- putrescine
- amino acid
- ornithine decarboxylase
- polypeptide
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Abstract
Description
[反1]
L-オルニチン<=>プトレシン+CO2
4種の微生物から由来するオルニチン脱炭酸酵素の基質反応性を比較した。ラクトバチルス・サエリムネリ(Lactobacillus saerimneri(inducible))、サッカロミセス・セレビシエ(saccharomyces cerevisiae(inducible))、イコライ(E.coli(constitutive))、イコライ(E.coli(inducible))から由来の野生型のオルニチン脱炭酸酵素を対象とし、それをそれぞれODC_Lb、ODC_Sc、ODC_Ec、ODC_Efと表記した。前記酵素に該当する遺伝子をpET24maベクターに挿入後、大腸菌BL21(DE3)を用いて0.1MM IPTG及び18℃の条件でタンパク質を発現した。以後、10%細胞抽出物を用いて45℃で初期反応速度を比較した。基質として4mMオルニチンを使用した場合と4mMリジンを使用した場合とをそれぞれ比較した。
ラクトバシラスオルニチン脱炭酸酵素は、結晶構造が知られており、構造分析を通じて基質が酵素に出入りするトンネル予測が可能である。予測されたトンネル部分のうち、飽和変異を行う機能的残基(functional residues)を選択するために、生物情報学の配列情報を利用した多数配列整列(multiple sequence alignment)を行い、本発明で利用するオルニチン脱炭酸酵素アミノ酸配列のN末端からA696、V702、A713、E698の位置を変異位置として選定した。
飽和変異(saturation mutagenesis)は、遺伝子の指定された位置に多様な塩基配列の変化を導入することを言う。飽和変異は、鋳型鎖に結合する相補的な配列のプライマー(primer)上に、変異させようとする配列の代わりに、NNKコドン(codon)を挿入してPCRを通じて変異を挿入させることを言う。この際、NNKコドンで、Nは、ヌクレオチドのA、T、G、Cを意味し、Kは、T、Gを意味する。
前記実施例3で使われたオルニチン脱炭酸酵素の変異型のうち、70%以上の固有活性度を有する変異型であるA713L、E698D、及びE698D/A713Lの特性をさらに綿密に確認しようとした。前記変異型及び野生型の動力学的係数(Kinetic parameter)を比較するために、多様な濃度条件のリジンを利用した。動力学的係数は、互いに異なる濃度を有した基質溶液を用いて酵素の基質親和度及び基質転換能力数値を示す。
変異型のうち、最も高いオルニチン固有活性度を有する変異型であるオルニチン脱炭酸酵素(A713L)が、プトレシンまたはカダベリンの生成に及ぼす影響を調べようとした。高い濃度51.5g/L(0.39M)のオルニチンを基質として使用した場合と、濃度2.57g/L(17.6mM)のリジンを基質として使用した場合と、をそれぞれ進行した。2種の基質条件で反応を進行するに当って、適当な反応条件を取るために、pHを適正するバッファ濃度を2種の条件(0.1Mまたは0.37M)で進行した。
実施例1で言及された4種の微生物由来オルニチン脱炭酸酵素ODC_Lb、ODC_Sc、ODC_Ec、ODC_Efを発現させるための組換え遺伝子の製作方法は、次の通りである。
本発明のオルニチン脱炭酸酵素変異型が、プトレシンの生産に及ぼす影響を調べるために、プトレシン生産能が向上したコリネバクテリウム属微生物に、前記オルニチン脱炭酸酵素変異型を導入した菌株を製作した。
選択された変異のうち、ラクトバシラスオルニチン脱炭酸酵素の713番目のアラニンがロイシンに置換された機能的残基(A713L)に対して、アラニン及びロイシンを除いた他のアミノ酸に置換した後、プトレシン生産菌株KCCM11240Pに導入して、プトレシンの生産に及ぼす影響を調べた。
Claims (16)
- 配列番号1のa)713番目、b)698番目、またはc)713番目及び698番目に相応する位置でアミノ酸置換を含み、配列番号1のポリペプチドに少なくとも80%以上、100%未満の配列相同性を有する、オルニチン脱炭酸酵素の変異型。
- 前記713番目の位置のアミノ酸置換は、アラニンを除いた疎水性アミノ酸、塩基性アミノ酸、酸性アミノ酸、中性アミノ酸、または芳香族性アミノ酸への置換である、請求項1に記載のオルニチン脱炭酸酵素の変異型。
- 前記713番目の位置のアミノ酸置換は、A713L、A713I、A713V、A713R、A713D、A713W、またはA713Qである、請求項1に記載のオルニチン脱炭酸酵素の変異型。
- 前記698番目の位置のアミノ酸置換は、E698Dである、請求項1に記載のオルニチン脱炭酸酵素の変異型。
- 前記713番目の位置のアミノ酸置換は、A713L、A713I、A713V、A713R、A713D、A713W、またはA713Qであり、前記698番目の位置のアミノ酸置換は、E698Dである、請求項1に記載のオルニチン脱炭酸酵素の変異型。
- 前記オルニチン脱炭酸酵素の変異型は、配列番号4、配列番号8、配列番号9、及び配列番号19から配列番号23のうちから選択されるポリペプチドを含む、請求項1に記載のオルニチン脱炭酸酵素の変異型。
- 請求項1から請求項6のうち何れか一項に記載のオルニチン脱炭酸酵素の変異型をコーディングする、ポリヌクレオチド。
- 配列番号1のポリペプチドを含むか、または配列番号1のa)713番目、b)698番目、またはc)713番目及び698番目に相応する位置でアミノ酸置換を含み、配列番号1のポリペプチドに少なくとも80%以上、100%未満の配列相同性を有するポリペプチドを含むオルニチン脱炭酸酵素を含む、微生物。
- 前記微生物は、エシェリキア属またはコリネバクテリウム属である、請求項8に記載の微生物。
- 配列番号1のポリペプチドを含むか、または配列番号1のa)713番目、b)698番目、またはc)713番目及び698番目に相応する位置でアミノ酸置換を含み、配列番号1のポリペプチドに少なくとも80%以上、100%未満の配列相同性を有するポリペプチドを含むオルニチン脱炭酸酵素を含む微生物を培養する段階を含む、プトレシンの生産方法。
- 培地内にプトレシンを蓄積する段階を含む、請求項10に記載のプトレシンの生産方法。
- 培養された微生物または培地からプトレシンを回収する段階を含む、請求項10に記載のプトレシンの生産方法。
- 配列番号1のポリペプチドを含むか、または配列番号1のa)713番目、b)698番目、またはc)713番目及び698番目に相応する位置でアミノ酸置換を含み、配列番号1のポリペプチドに少なくとも80%以上、100%未満の配列相同性を有するポリペプチドを含むオルニチン脱炭酸酵素を含む微生物を培養する段階を含む、プトレシンの純度を増加させる方法。
- 配列番号1のポリペプチドを含むか、または配列番号1のa)713番目、b)698番目、またはc)713番目及び698番目に相応する位置でアミノ酸置換を含み、配列番号1のポリペプチドに少なくとも80%以上、100%未満の配列相同性を有するポリペプチドを含むオルニチン脱炭酸酵素を含む微生物を培養する段階を含む、カダベリンに対するプトレシンの比率を増加させる方法。
- プトレシンでポリアミドを製造する方法であって、前記プトレシンは、配列番号1のポリペプチドを含むか、または配列番号1のa)713番目、b)698番目、またはc)713番目及び698番目に相応する位置でアミノ酸置換を含み、配列番号1のポリペプチドに少なくとも80%以上、100%未満の配列相同性を有するポリペプチドを含むオルニチン脱炭酸酵素を含む微生物を培養して製造された、ポリアミドの製造方法。
- 配列番号1のポリペプチドを含むか、または配列番号1のa)713番目、b)698番目、またはc)713番目及び698番目に相応する位置でアミノ酸置換を含み、配列番号1のポリペプチドに少なくとも80%以上、100%未満の配列相同性を有するポリペプチドを含むオルニチン脱炭酸酵素を含む微生物を含む、ポリアミド製造用組成物。
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