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Structural biology of the mechanism of biomembrane phospholipid biosynthesis by phosphatidylserine decarboxylase

Research Project

Project/Area Number 20K15734
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 43020:Structural biochemistry-related
Research InstitutionYamagata University

Principal Investigator

Watanabe Yasunori  山形大学, 理学部, 講師 (30772636)

Project Period (FY) 2020-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
KeywordsX線結晶構造解析 / リン脂質 / PS脱炭酸酵素 / ホスファチジルコリン / PmtA / NMR / ホスファチジルセリン脱炭酸酵素 / リン脂質代謝 / 結晶構造解析 / ホスファチジルエタノールアミン
Outline of Research at the Start

大腸菌由来PSDについて,以下のプロセスで研究を進める.①アポ型PSDの結晶構造解析.②基質結合型PSDの結晶構造解析.③リポソームを用いた膜結合メカニズムの解明.④構造に基づいた基質認識及び反応触媒モデルの構築,およびin vitro, in vivo両面からの検証.以上の結果から,PSDによるPE生合成メカニズムを明らかにする.本研究の成果をもとに,大腸菌のみならず,より高等な生物のリン脂質代謝機構の解明にも発展させることが可能となる.

Outline of Final Research Achievements

Phosphatidylserine decarboxylase (PSD) is involved in the biosynthesis of phosphatidylethanolamine (PE), one of major phospholipid in biomembrane. However the detailed mechanisms of PE biosynthesis by PSD remain unclear, because the structure of PSD has not been clarified for nearly 50 years since its discovery. In this study, we succeeded for the first time in determining the structures of the apo-form and substrate-bound forms of PSD from Escherichia coli by X-ray crystallography. Mutational analysis based on the determined structures revealed the amino acid residues involved in substrate recognition and the mechanism of membrane binding. These results provide a structural basis for understanding the mechanism of PE biosynthesis by PSDs.

Academic Significance and Societal Importance of the Research Achievements

PEの生合成に関わるPSDは細菌からヒトに至るまで高度に保存されており,リン脂質代謝において重要な役割を果たしている。ヒト由来PSD遺伝子(PISD遺伝子)に変異が導入されることが原因で白内障や骨系統疾患が発症することが報告された。これらは生体膜を構成するリン脂質の代謝の恒常性維持が生命活動に密接に関連していることを示唆している。本研究でのPSDの構造解析研究を通して将来的にはPISD遺伝子の変異によりヒトの疾患が引き起こされる原因の解明につながるであろう。

Report

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

    (8 results)

All 2021 2020 Other

All Int'l Joint Research (2 results) Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (4 results) (of which Invited: 1 results)

  • [Int'l Joint Research] Johns Hopkins University(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Johns Hopkins University(米国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Impaired phosphatidylethanolamine metabolism activates a reversible stress response that detects and resolves mutant mitochondrial precursors2021

    • Author(s)
      Sam Pingdewinde N.、Calzada Elizabeth、Acoba Michelle Grace、Zhao Tian、Watanabe Yasunori、Nejatfard Anahita、Trinidad Jonathan C.、Shutt Timothy E.、Neal Sonya E.、Claypool Steven M.
    • Journal Title

      iScience

      Volume: 24 Issue: 3 Pages: 102196-102196

    • DOI

      10.1016/j.isci.2021.102196

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Structural Basis for Phosphatidylethanolamine Biosynthesis by Bacterial Phosphatidylserine Decarboxylase2020

    • Author(s)
      Watanabe Yasunori、Watanabe Yasuo、Watanabe Seiya
    • Journal Title

      Structure

      Volume: 28 Issue: 7 Pages: 799-809.e5

    • DOI

      10.1016/j.str.2020.04.006

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] ミトコンドリアにおけるホスファチジルエタノールアミン生合成機構の構造基盤2021

    • Author(s)
      渡邊康紀
    • Organizer
      第20回日本ミトコンドリア学会年会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] PE生合成を担うPS脱炭酸酵素の構造機能解析2021

    • Author(s)
      渡邊康紀
    • Organizer
      第63回日本脂質生化学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] ホスファチジルセリン脱炭酸酵素の結晶構造が解き明かす生体膜リン脂質生合成機構2020

    • Author(s)
      渡邊康紀
    • Organizer
      第93回日本生化学会大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Crystal Structures of Phosphatidylserine Decarboxylase Reveal the Basis of Phosphatidylethanolamine Biosynthesis2020

    • Author(s)
      渡邊康紀
    • Organizer
      第20回日本蛋白質科学会年会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2023-01-30  

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