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Higher-Order Structures of Proteins in Solution Explored by Using Low-Frequency Raman Optical Activity

Research Project

Project/Area Number 19K05524
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 34020:Analytical chemistry-related
Research InstitutionOsaka University

Principal Investigator

Yamamoto Shigeki  大阪大学, 理学研究科, 助教 (60552784)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywordsキラリティ / タンパク質構造 / 振動光学活性 / テラヘルツ / 低波数 / αヘリックス / ラマン分光 / 光学活性 / 分子分光 / 高分子構造 / 生体関連高分子 / スペクトル分析 / レーザー分光
Outline of Research at the Start

αヘリックス構造に代表されるタンパク質のキラルな二次構造は紫外円二色性などによって簡便に測定されてきた。しかし,さらに高次のタンパク質構造の測定も必要不可欠である。一方で,溶媒分子とタンパク質との間に形成されるキラルな溶媒和構造を直接測定できれば,タンパク質の溶解や変性初期反応をより深く理解できるだろう。しかし,これらタンパク質のキラル高次構造を溶液中において簡便に測定することは難しい。本研究においては新規な低波数ラマン光学活性分光を開発し,溶液中タンパク質のキラル高次構造を直接に解析できる簡便な測定法を開発する。

Outline of Final Research Achievements

To analyze chiral higher-order structures of proteins, their fluctuation in solutions, and chiral solute-solvent interactions, we have extended a measurable region of chiral vibrational spectroscopy, Raman Optical Activity (ROA), to the lower frequency region and measured low-frequency ROA of proteins in solutions at the first time. A new spectrometer was developed for the measurements and peak assignments were attempted by comparing spectra of proteins of which crystal structures are well-known. Furthermore, experimental spectrum of an alpha-helical polypeptide was well reproduced by quantum mechanical simulation, which explored that the low-frequency ROA can reflect a long-range interaction of alpha-helix within about two helix turns and its structural fluctuation in solutions.

Academic Significance and Societal Importance of the Research Achievements

ラマン光学活性の測定範囲を低波数領域にまで拡張し,溶液中タンパク質の測定を初めて行ったことは,タンパク質のキラル高次構造とその揺らぎを直接に簡便に測定する新規な方法を開拓した点で学術的意義が高い。生物のキラル選択的な反応の一因はタンパク質のキラル高次構造とその反応にあると考えられるため,その解析手法の開発はキラル薬剤の開発の一助となるだろう。

Report

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

    (12 results)

All 2022 2021 2019 Other

All Int'l Joint Research (3 results) Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results) Presentation (3 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results) Remarks (2 results)

  • [Int'l Joint Research] IOCB(チェコ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] IOCB(チェコ)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] IOCB(チェコ)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Probing the solvation of the α-helix with extended amide III bands in Raman optical activity2022

    • Author(s)
      Yamamoto Shigeki、Kimura Fumiya
    • Journal Title

      Physical Chemistry Chemical Physics

      Volume: 24 Issue: 5 Pages: 3191-3199

    • DOI

      10.1039/d1cp04480j

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Intense chiral signal from α-helical poly-L-alanine observed in low-frequency Raman optical activity2021

    • Author(s)
      Yamamoto Shigeki、Ishiro Shota、Kessler Jiri、Bour Petr
    • Journal Title

      Physical Chemistry Chemical Physics

      Volume: 23 Issue: 46 Pages: 26501-26509

    • DOI

      10.1039/d1cp04401j

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Advances, challenges and perspectives of quantum chemical approaches in molecular spectroscopy of the condensed phase2021

    • Author(s)
      Ozaki Yukihiro、Bec Krzysztof B.、Morisawa Yusuke、Yamamoto Shigeki、Tanabe Ichiro、Huck Christian W.、Hofer Thomas S.
    • Journal Title

      Chemical Society Reviews

      Volume: 50 Issue: 19 Pages: 10917-10954

    • DOI

      10.1039/d0cs01602k

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Low-Frequency Vibrational Modes of Nylon 6 Studied by Using Infrared and Raman Spectroscopies and Density Functional Theory Calculations2019

    • Author(s)
      Yamamoto Shigeki、Ohnishi Erika、Sato Harumi、Hoshina Hiromichi、Ishikawa Daitaro、Ozaki Yukihiro
    • Journal Title

      The Journal of Physical Chemistry B

      Volume: 123 Issue: 25 Pages: 5368-5376

    • DOI

      10.1021/acs.jpcb.9b04347

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Relation Between Solvated States of α-Helical Peptides and Extended Amide III Bands in Raman Optical Activity2019

    • Author(s)
      Shigeki Yamamoto
    • Organizer
      10th International Conference on Advanced Vibrational Spectroscopy (ICAVS10)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 低波数ラマン光学活性に観測されるテルペンの高強度キラル信号2019

    • Author(s)
      井城翔太,山本茂樹
    • Organizer
      日本分光学会年次講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 低波数ラマン光学活性によるリモネンおよび類似化合物の高強度キラル信号の測定2019

    • Author(s)
      井城翔太,塚原聡,山本茂樹
    • Organizer
      日本分析化学会第68年会
    • Related Report
      2019 Research-status Report
  • [Remarks] 大阪大学大学院理学研究科化学専攻 分析化学研究室

    • URL

      https://www.chem.sci.osaka-u.ac.jp/lab/tsukahara/research.htm

    • Related Report
      2021 Annual Research Report
  • [Remarks] 大阪大学大学院理学研究科化学専攻分析化学研究室

    • URL

      http://www.chem.sci.osaka-u.ac.jp/lab/tsukahara/

    • Related Report
      2019 Research-status Report

URL: 

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

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