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Residual Structures of Denatured Proteins Studied by Two-Dimensional NMR Using a Spin-Desalting Column

Research Project

Project/Area Number 20K06574
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 43040:Biophysics-related
Research InstitutionThe University of Tokyo

Principal Investigator

Kuwajima Kunihiro  東京大学, 大学院理学系研究科(理学部), 名誉教授 (70091444)

Co-Investigator(Kenkyū-buntansha) 加藤 晃一  大学共同利用機関法人自然科学研究機構(機構直轄研究施設), 生命創成探究センター, 教授 (20211849)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords蛋白質フォールディング / 水素/重水素交換 / 二次元NMR / 変性状態 / 残存構造
Outline of Research at the Start

高濃度変性剤中にある蛋白質の残存立体構造の解析は,蛋白質のフォールディング分子機構を理解する上で重要である。本研究では,スピン脱塩カラムを利用して,高濃度変性剤中の蛋白質の水素重水素交換反応を,ジメチルスルホキシド溶液で反応停止された二次元NMR法を用いて解析する。5種の代表的球状蛋白質を対象とする。本研究の実現により,変性剤中でほどけた蛋白質の水素交換保護度から,蛋白質中の残存構造を明らかにすることができる。高濃度変性剤中で蛋白質はランダム・コイルとの従来の定説を覆し,蛋白質フォールディングの斬新なモデルを提供して,その分子機構の究極的解明に大きく寄与することが出来る。

Outline of Final Research Achievements

Analysis of residual structures of proteins in high concentrations of a denaturant is an important issue for protein folding studies. In this study, the hydrogen/deuterium (H/D) exchange reactions of peptide NH groups in 6 M GdmCl (guanidinium chloride) were analyzed for ubiquitin and BDPA (the B domain of staphylococcal protein A) using spin desalting columns and two-dimensional NMR techniques. The results showed that in 6 M GdmCl, the structures of both proteins were not randomly coiled, but there were residual structures with hydrogen bonds. The residual structure is present in the stable secondary structure region in the native structures, and hence they are expected to play an important role in the initial structure formation in the protein folding reaction.

Academic Significance and Societal Importance of the Research Achievements

蛋白質フォールディング機構の研究は,蛋白質の間違ったフォールディングによって引き起こされる,ヒトの様々なフォールディング病(アルツハイマー病,白内障,クロイツフェルト・ヤコブ病,パーキンソン病,II型糖尿病など多数)などの原因解明や治療法の構築の応用研究に役立つと期待される,基盤的な研究である。最近の研究では,高濃度変性剤中では蛋白質は完全なランダムコイル状態ではなく残存構造のあることを示唆する例がいくつか報告されているが,残存構造をアミノ酸残基レベルで詳細に明らかにして例はない。本研究の結果,残存構造の詳細が明らかとなり,蛋白質フォールディング機構の解明に大きく寄与すると期待される。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (9 results)

All 2024 2023 2022 2020

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (6 results) (of which Int'l Joint Research: 4 results,  Invited: 5 results)

  • [Journal Article] The B domain of protein A retains residual structures in 6 M guanidinium chloride as revealed by hydrogen/deuterium‐exchange NMR spectroscopy2023

    • Author(s)
      Yanaka Saeko、Yagi‐Utsumi Maho、Kato Koichi、Kuwajima Kunihiro
    • Journal Title

      Protein Science

      Volume: 32 Issue: 3

    • DOI

      10.1002/pro.4569

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] DMSO-Quenched H/D-Exchange 2D NMR Spectroscopy and Its Applications in Protein Science2022

    • Author(s)
      Kuwajima Kunihiro、Yagi-Utsumi Maho、Yanaka Saeko、Kato Koichi
    • Journal Title

      Molecules

      Volume: 27 Issue: 12 Pages: 3748-3748

    • DOI

      10.3390/molecules27123748

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Residual Structure of Unfolded Ubiquitin as Revealed by Hydrogen/Deuterium-Exchange 2D NMR2020

    • Author(s)
      Yagi-Utsumi Maho、Chandak Mahesh S.、Yanaka Saeko、Hiranyakorn Methanee、Nakamura Takashi、Kato Koichi、Kuwajima Kunihiro
    • Journal Title

      Biophysical Journal

      Volume: 119 Issue: 10 Pages: 2029-2038

    • DOI

      10.1016/j.bpj.2020.10.003

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] The molecular mechanisms of protein folding: Analysis of PFDB2024

    • Author(s)
      Kunihiro Kuwajima
    • Organizer
      The 9th Korean-Polish Conference on Protein Folding
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] The DMSO-quenched H/D-Exchange 2D NMR Spectroscopy and Its Applications in Protein Science2023

    • Author(s)
      Kunihiro Kuwajima
    • Organizer
      The 8th Polish-Korean Conference on Protein Folding
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] The molecular mechanisms of protein folding2023

    • Author(s)
      Kunihiro Kuwajima
    • Organizer
      The 21st KIAS Conference on Protein Structure and Function
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] The B domain of Protein A Retains Residual Structures in 6 M Guanidium Chloride as Revealed by Hydrogen/Deuterium-Exchange NMR Spectroscopy2022

    • Author(s)
      Saeko Yanaka, Maho Yagi-Utsumi, Koichi Kato, and Kunihiro Kuwajima
    • Organizer
      The 20th KIAS Conference on Protein Structure and Function
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Residual structures in the unfolded state of a three-helix bundle protein in 6 M guanidinium chloride studied by H/D-exchange 2D NMR2022

    • Author(s)
      Kunihiro Kuwajima, Saeko Yanaka, Maho Yagi-Utsumi, and Koichi Kato
    • Organizer
      第60回 日本生物物理学会年会(函館)
    • Related Report
      2022 Research-status Report
  • [Presentation] The H/D-exchange kinetics of unfolded ubiquitin in 6 M GdmCl studied by the DMSO-quenched 2D NMR techniques2020

    • Author(s)
      桑島 邦博,矢木-内海 真穂,谷中 冴子,加藤 晃一
    • Organizer
      第58回 日本生物物理学会年会 シンポジウム
    • Related Report
      2020 Research-status Report
    • Invited

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Published: 2020-04-28   Modified: 2025-01-30  

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