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Development of a codon-based mutagenesis method enabling deletion, substitution, and insertion of codons

Research Project

Project/Area Number 19K05163
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 27040:Biofunction and bioprocess engineering-related
Research InstitutionOsaka University

Principal Investigator

Okano Kenji  大阪大学, 工学研究科, 助教 (40623335)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords進化分子工学 / コドン / 置換 / 欠失 / 挿入 / TypeIIS 制限酵素 / 塩基置換 / InDel
Outline of Research at the Start

酵素(タンパク質)をコードするDNAに突然変異を導入し、高機能変異体を選抜する進化分子工学は、酵素の機能改変のための強力な手法である。既往の突然変異導入法は主としてDNAの1塩基置換に基づき、変異のバラエティ・均質性に限りがあった。また、時として酵素の劇的な機能向上をもたらす、アミノ酸の挿入・欠失を引き起こすこともできない。本申請課題では、メタノールからの物質生産における重要酵素であるメタノールデヒドロゲナーゼをモデルに、DNAのランダムな位置に20種のアミノ酸に対応するコドンを等確率で置換・挿入・欠失可能な「Codon-based random mutagenesis法」の開発を行う。

Outline of Final Research Achievements

Directed evolution of enzyme, which is based on introduction of mutation and following selection of functional mutant enzyme, is a powerful technique for improving the function of enzyme. To expand the variety of mutant, in this study, I developed a mutagenesis method allowing deletion, substitution, and insertion of codons for the target codon of the target gene.
Specifically, inverse PCR was performed using a plasmid containing the target gene as a template, and adapter sequences were added to both termini of the target codon. The adapter sequence contains recognition sequences for three types of Type IIS restriction enzymes. By using different types of restriction enzymes and following self-ligation, deletion, substitution, and insertion of codons into target site were successfully achieved. The method was also successfully applied to all codons of the target gene to create a mutant enzyme library.

Academic Significance and Societal Importance of the Research Achievements

バイオ市場はかつてない活況を呈しており、酵素や多数の酵素が協奏的に働く微生物細胞による物質生産も多分に漏れず、各国が技術開発に鎬を削っている。望みの機能を有する酵素の開発は、未だランダム変異に頼るところが大きいものの、エラープローンPCRに代表される既往の変異導入法は「変異体のバラエティ」と「発生頻度の均一性」に乏しい。したがって、変異体の解析数とラウンド数は自ずと増加し、多大な時間を有する。一方、本研究で開発した作成した変異酵素群は変異のバラエティに富み、同一の変異を含む確率は従来法より低い。従って、高機能な変異体を短時間で取得できるものと期待できる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (2 results)

All 2021 2020

All Journal Article (2 results) (of which Peer Reviewed: 2 results)

  • [Journal Article] Genome editing by miniature CRISPR/Cas12f1 enzyme in Escherichia coli2021

    • Author(s)
      Kenji Okano, Yu Sato, Tatsuya Hizume, Kohsuke Honda
    • Journal Title

      Journal of Bioscience and Bioengineering

      Volume: -

    • NAID

      40022657700

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] In vitro reconstitution of non-phosphorylative EntnereDoudoroff pathway for lactate production2020

    • Author(s)
      Kenji Okano, Qianqin Zhu, Kohsuke Honda
    • Journal Title

      Journal of Bioscience and Bioengineering

      Volume: 129 Issue: 3 Pages: 269-275

    • DOI

      10.1016/j.jbiosc.2019.09.010

    • Related Report
      2019 Research-status Report
    • Peer Reviewed

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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