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Elucidation of physical properties and intracellular functions of unanchored atypical ubiquitin chains

Research Project

Project/Area Number 20K15757
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 43040:Biophysics-related
Research InstitutionKyoto University

Principal Investigator

Morimoto Daichi  京都大学, 工学研究科, 助教 (40746616)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
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)
Keywordsユビキチン / 構造ゆらぎ / ATP / 環状 / NMR / 非定型鎖 / 構造揺らぎ / ユビキチン鎖 / 非定型ユビキチン鎖 / 遊離ユビキチン鎖 / タンパク質物性
Outline of Research at the Start

タンパク質の翻訳後修飾のひとつであるユビキチン修飾の特徴は、基質となる細胞内タンパク質にユビキチンが数珠状に幾つも連なり、鎖を形成することである。一方、細胞内には基質に結合していない遊離ユビキチン鎖も存在し、形態も直鎖状だけでなく分岐や環状といった非定型のユビキチン鎖がある。では、遊離で非定型のユビキチン鎖はどのような細胞内機能を持つのだろうか。本研究では、試験管内で調製した遊離鎖を細胞に直接導入することで、細胞内機能を解明することを目的とする。遊離鎖は凝集や免疫応答への関与が指摘されているため、これらに関わる物性および相互作用を試験管内で特定し、細胞内でどのように機能発現するのか調べる。

Outline of Final Research Achievements

Conjugation of ubiquitin chains with substrates plays a role in various biological phenomena. Recently, atypical (branched and cyclic chains) and unanchored ubiquitin chains have been identified. However, their physical properties and functions remain poorly understood. In this study, we conducted a structural analysis of atypical and unanchored ubiquitin chains using solution NMR to gain a deeper understanding of their characteristics. Our findings reveal that ubiquitin chains exhibit distinct structural fluctuations among ubiquitin units, which are related with susceptibility of post-translational modifications. In addition, ubiquitin weakly interacts with ATP, which is abundantly present in cells. This suggests that ubiquitin chains are less likely to self-associate or aggregate in cells. Additionally, cyclic ubiquitin chains demonstrate a different recognition mechanism compared with the noncyclic form and the cyclic chains are found to be less prone to cleavage.

Academic Significance and Societal Importance of the Research Achievements

これまでのユビキチン鎖研究は単一の結合型で形成された直鎖状の短いユビキチン鎖が中心であった。だが現在、続々と非定型のユビキチン鎖が発見されており、ユビキチン鎖研究でパラダイムシフトが起こっている状況にある。本研究で明らかにしたユビキチン鎖におけるユニット間の異なる構造ゆらぎ、ATPとの弱い相互作用、環状鎖の特異的な認識機構はいずれも既存のユビキチンバイオロジーでは想定できなかった知見であり、新規の概念を与えるものとなった。また、タンパク質科学の観点から、これまでの静的な構造解析とは一線を画し、タンパク質機能を明らかにする上での動的構造解析の重要性を示した研究結果となった。

Report

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

    (15 results)

All 2022 2021 2020

All Journal Article (11 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 11 results) Presentation (4 results) (of which Invited: 4 results)

  • [Journal Article] Counter-flow phenomena studied by nuclear magnetic resonance (NMR) velocimetry and flow simulations2022

    • Author(s)
      Kohn Benjamin、Walinda Erik、Sugase Kenji、Morimoto Daichi、Scheler Ulrich
    • Journal Title

      Physics of Fluids

      Volume: 34 Issue: 7 Pages: 073608-073608

    • DOI

      10.1063/5.0097543

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Rheo‐NMR Spectroscopy for Cryogenic‐Probe‐Equipped NMR Instruments to Monitor Protein Aggregation2022

    • Author(s)
      Morimoto Daichi、Walinda Erik、Yamamoto Akihiko、Scheler Ulrich、Sugase Kenji
    • Journal Title

      Current Protocols

      Volume: 2 Issue: 12

    • DOI

      10.1002/cpz1.617

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Structural Insights into Methylated DNA Recognition by the Methyl-CpG Binding Domain of MBD6 from <i>Arabidopsis thaliana</i>2022

    • Author(s)
      Mahana Yutaka、Ohki Izuru、Walinda Erik、Morimoto Daichi、Sugase Kenji、Shirakawa Masahiro
    • Journal Title

      ACS Omega

      Volume: 7 Issue: 4 Pages: 3212-3221

    • DOI

      10.1021/acsomega.1c04917

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Multiple-State Monitoring of SOD1 Amyloid Formation at Single-Residue Resolution by Rheo-NMR Spectroscopy2021

    • Author(s)
      Iwakawa Naoto、Morimoto Daichi、Walinda Erik、Shirakawa Masahiro、Sugase Kenji
    • Journal Title

      Journal of the American Chemical Society

      Volume: 143 Issue: 28 Pages: 10604-10613

    • DOI

      10.1021/jacs.1c02974

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Backbone resonance assignments of the A2 domain of mouse von Willebrand factor2021

    • Author(s)
      Morimoto Daichi、Osugi Masanori、Mahana Yutaka、Walinda Erik、Shirakawa Masahiro、Sugase Kenji
    • Journal Title

      Biomolecular NMR Assignments

      Volume: 15 Issue: 2 Pages: 427-431

    • DOI

      10.1007/s12104-021-10041-8

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effects of Weak Nonspecific Interactions with ATP on Proteins2021

    • Author(s)
      Nishizawa Mayu、Walinda Erik、Morimoto Daichi、Kohn Benjamin、Scheler Ulrich、Shirakawa Masahiro、Sugase Kenji
    • Journal Title

      Journal of the American Chemical Society

      Volume: 143 Issue: 31 Pages: 11982-11993

    • DOI

      10.1021/jacs.0c13118

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Expression, solubility monitoring, and purification of the co-folded LUBAC LTM domain by structure-guided tandem folding in autoinducing cultures2021

    • Author(s)
      Walinda Erik、Morimoto Daichi、Sorada Tomoki、Iwai Kazuhiro、Sugase Kenji
    • Journal Title

      Protein Expression and Purification

      Volume: 187 Pages: 105953-105953

    • DOI

      10.1016/j.pep.2021.105953

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Rigorous analysis of the interaction between proteins and low water-solubility drugs by qNMR-aided NMR titration experiments2021

    • Author(s)
      Hirakawa Takuya、Walinda Erik、Morimoto Daichi、Sugase Kenji
    • Journal Title

      Physical Chemistry Chemical Physics

      Volume: 23 Issue: 38 Pages: 21484-21488

    • DOI

      10.1039/d1cp03175a

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Transient Diffusive Interactions with a Protein Crowder Affect Aggregation Processes of Superoxide Dismutase 1 β-Barrel2021

    • Author(s)
      Iwakawa Naoto、Morimoto Daichi、Walinda Erik、Leeb Sarah、Shirakawa Masahiro、Danielsson Jens、Sugase Kenji
    • Journal Title

      The Journal of Physical Chemistry B

      Volume: 125 Issue: 10 Pages: 2521-2532

    • DOI

      10.1021/acs.jpcb.0c11162

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Structural Dynamic Heterogeneity of Polyubiquitin Subunits Affects Phosphorylation Susceptibility2021

    • Author(s)
      Morimoto Daichi、Walinda Erik、Takashima Shingo、Nishizawa Mayu、Iwai Kazuhiro、Shirakawa Masahiro、Sugase Kenji
    • Journal Title

      Biochemistry

      Volume: 60 Issue: 8 Pages: 573-583

    • DOI

      10.1021/acs.biochem.0c00619

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Quantitative monitoring of ubiquitination/deubiquitination reaction cycles by 18O-incorporation2020

    • Author(s)
      Tanaka Yuka、Morimoto Daichi、Walinda Erik、Sugase Kenji、Shirakawa Masahiro
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 529 Issue: 2 Pages: 418-424

    • DOI

      10.1016/j.bbrc.2020.06.008

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Atomic-level elucidation of amyloid formation mechanism by NMR spectroscopy2022

    • Author(s)
      森本大智
    • Organizer
      第61回NMR討論会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] レオロジーNMR法によるSOD1アミロイド形成の多状態その場観察2022

    • Author(s)
      森本大智
    • Organizer
      第60回日本生物物理学会年会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 溶液NMR法を用いたタンパク質のその場観察2022

    • Author(s)
      森本大智
    • Organizer
      第22回若手NMR研究会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Multiple-state monitoring of amyloid formation at atomic resolution by Rheology NMR spectroscopy2022

    • Author(s)
      森本大智
    • Organizer
      第22回日本蛋白質科学会年会
    • Related Report
      2022 Annual Research Report
    • Invited

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Published: 2020-04-28   Modified: 2024-12-25  

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