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Molecular evolution of tryptophan degrading enzymes.

Research Project

Project/Area Number 17K07514
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Evolutionary biology
Research InstitutionKochi University

Principal Investigator

Yuasa Hajime  高知大学, 教育研究部自然科学系理工学部門, 准教授 (40322797)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsトリプトファン分解酵素 / 分子進化 / 比較生化学
Outline of Final Research Achievements

The ciliate Blepharisma has four IDO genes and each IDO enzyme has a distinct enzymatic property. IDO-III has a high affinity for L-Trp, whereas the affinity of the other isoforms for L-Trp is low. Meanwhile, IDO-I shows a significant catalytic activity with another indole compound: 5-hydroxy-L-tryptophan. By analysing a series of chimeric enzymes based on extant and predicted ancestral enzymes, Asn131 in IDO-I and Glu132 in IDO-III were identified as the key residues responsible for their high affinity for each specific substrate.
The invertebrate IDOs generally show low catalytic efficiency for L-Trp. Meanwhile, two IDO isoforms from scallop (IDO-I and -III) and sponge IDOs show high L-Trp catalytic activity, which is comparable to vertebrate IDO1. Site-directed mutagenesis experiments have revealed that two residues, Tyr located at the 2nd residue on the F-helix (F2nd) and His located at G9th, are crucial for the high catalytic efficiency of these high performance invertebrate IDOs.

Academic Significance and Societal Importance of the Research Achievements

繊毛虫BlepharismaのIDO-IはL-トリプトファン以外のインドール化合物に,より高い親和性を示す点で,他に例の無いIDOである。その基質特異性に関わるアミノ酸残基を特定(Asn131)したことは,IDOの分子進化を探る上で重要である。更に,予想祖先型配列のキメラ解析への応用が有効な手段であることも証明できた。また,IDOの高触媒効率化において,脊椎・無脊椎動物に共通してF2nd/G9thの2つの残基が重要であることが判明し,今後のトリプトファン分解酵素の研究発展に対し,重要な情報となると考えられる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (7 results)

All 2020 2019 2018 2017

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] A comprehensive comparison of the metazoan tryptophan degrading enzymes.2020

    • Author(s)
      Yuasa HJ
    • Journal Title

      Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics

      Volume: 1868 Issue: 1 Pages: 1-11

    • DOI

      10.1016/j.bbapap.2019.06.014

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A single amino acid residue regulates the substrate affinity and specificity of indoleamine 2,3-dioxygenase.2018

    • Author(s)
      Yuasa Hajime J.、Sugiura Mayumi、Harumoto Terue
    • Journal Title

      Archives of Biochemistry and Biophysics

      Volume: 640 Pages: 1-9

    • DOI

      10.1016/j.abb.2017.12.019

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] トリプトファン分解酵素の分子進化の新局面 XI2019

    • Author(s)
      湯浅 創
    • Organizer
      第92回日本生化学会大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Molecular Evolution of Tryptophan-degrading Enzymes.2018

    • Author(s)
      Hajime Julie YUASA(湯浅 創)
    • Organizer
      The 15th International Society for Tryptophan Research Conference (ISTRY2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] トリプトファン分解酵素の分子進化の新局面 X2018

    • Author(s)
      湯浅 創
    • Organizer
      第91回日本生化学会大会
    • Related Report
      2018 Research-status Report
  • [Presentation] ツールとしての祖先型配列:キメラ解析への応用2017

    • Author(s)
      湯浅 創
    • Organizer
      第19回日本進化学会大会
    • Related Report
      2017 Research-status Report
  • [Presentation] トリプトファン分解酵素の分子進化の新局面 IX2017

    • Author(s)
      湯浅 創,杉浦 真由美,春本 晃江
    • Organizer
      第90回日本生化学会大会(2017年度 生命科学系学会合同年次大会)
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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