• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Clarification of the coupling mechanism between polymerization and GTP hydrolysis by using tubulin mutant

Research Project

Project/Area Number 17H03668
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Biophysics
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Muto Etsuko  国立研究開発法人理化学研究所, 脳神経科学研究センター, チームリーダー (90373373)

Co-Investigator(Kenkyū-buntansha) 今井 洋  大阪大学, 理学研究科, 助教 (60391869)
上村 慎治  中央大学, 理工学部, 教授 (90177585)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2019: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
Fiscal Year 2017: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Keywords微小管 / GTPチューブリン / 臨界核 / 重合キネティクス / ネガティブ染色電子顕微鏡法 / 核生成 / チューブリン / アロステリック制御 / 重合ダイナミクス / 核形成 / GTP / 生物物理
Outline of Final Research Achievements

Nucleation of microtubule is essential for cellular activities, but its mechanism is unknown because of the difficulty involved in capturing rare stochastic events in the early stage of polymerization. Combining the rapid flush negative stain electron microscopy and kinetic analysis, we demonstrated that the formation of straight oligomers with critical size is essential for nucleation. Both GDP- and GTP-tubulin assemble the single-stranded oligomers with a broad range of curvature, but upon nucleation of GTP-tubulin, the distribution of curvature is shifted to produce a minor population of straight oligomer. Our results support a model in which GTP binding generates a minor population of straight oligomers compatible with lateral association and further growth to microtubules. Our study suggests that cellular factors involved in nucleation promote it via stabilization of straight oligomers.

Academic Significance and Societal Importance of the Research Achievements

微小管の重合ダイナミクスは細胞が正常に機能する上で重要であり、その制御が失われると、癌や神経変性疾患など様々な疾病の原因となる。重合の第一段階である核生成の仕組みは、これまで40年以上もの間謎に包まれており、長年の難問を解決したことの意義は大きい。我々は、重合初期に出現する中間体の曲率や長さを統計的に解析することにより、これまでの研究者が見逃してきた直線形オリゴマーの発見に成功した。微小管のダイナミクスを考える上で、構造ゆらぎの統計的解析が、今後重要になることが予想される。

Report

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

    (17 results)

All 2020 2019 2018 2017 Other

All Int'l Joint Research (4 results) Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Open Access: 1 results) Presentation (11 results) (of which Int'l Joint Research: 5 results,  Invited: 4 results)

  • [Int'l Joint Research] Universite Paris-Saclay/Universite de Paris/ESPCI Paris and PSL University(フランス)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Universite Paris-Saclay/Universite de Paris/ESPCI Paris and PSL University(フランス)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] I2BC(フランス)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] Universite Paris Diderot(フランス)

    • Related Report
      2017 Annual Research Report
  • [Journal Article] GTP-dependent formation of straight oligomers leads to nucleation of microtubules2020

    • Author(s)
      Ayukawa Rie、Iwata Seigo、Imai Hiroshi、Kamimura Shinji、Hayashi Masahito、Ngo Kien Xuan、Minoura Itsushi、Uchimura Seiichi、Makino Tsukasa、Shirouzu Mikako、Shigematsu Hideki、Sekimoto Ken、Gigant Benoit、Muto Etsuko
    • Journal Title

      bioRxiv

      Volume: -

    • DOI

      10.1101/2020.03.05.979989

    • Related Report
      2019 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Journal Article] X-ray fiber diffraction: a tool for understanding the structural dynamics of tubulin dimers in native microtubules.2017

    • Author(s)
      Kamimura S
    • Journal Title

      Spring-8/SACLA Research Frontiers 2016

      Volume: 2016 Pages: 32-33

    • Related Report
      2017 Annual Research Report
  • [Presentation] A newly developed negative stain EM method for protein complexes at high protein concentration.2019

    • Author(s)
      Hiroshi Imai, Takayuki Kato, Gerle Christoph, Etsuko Muto, Kaoru Mitsuoka, Genji Kurisu, Keiichi Namba Takahide Kon
    • Organizer
      日本生物物理学会第57回年会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Dynamic changes of tubulin dimer configurations on a scale of sub-second revealed by high flux X-ray fiber diffraction2019

    • Author(s)
      Shinji Kamimura, Hiroshi Imai, Toshiki Yagi, Hiroyuki Iwamoto
    • Organizer
      日本生物物理学会第57回年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 高タンパク質濃度条件下のタンパク質複合体の構造を観察するための新規のネガティブ染色電子顕微鏡法2019

    • Author(s)
      今井洋,中桐 侑平,Gerle,C,武藤悦子,栗栖源嗣,昆隆英
    • Organizer
      2019年生体運動合同班会議
    • Related Report
      2018 Annual Research Report
  • [Presentation] 微小管のX線繊維回折:チューブリン格子ラセン角の計測2019

    • Author(s)
      上村慎治, 今井洋, 八木俊樹, 岩本裕之, Estevez-Galego, J., Lucena-Agell, D., Diaz, J.-F. & Hermida-Merino, D.
    • Organizer
      2019年生体運動合同班会議
    • Related Report
      2018 Annual Research Report
  • [Presentation] 微小管内のチューブリン分子の安定性・可塑性・柔軟性を目安にした微細動態解析2019

    • Author(s)
      上村慎治、今井洋、八木俊樹、岩本裕之
    • Organizer
      日本動物学会・関東支部 第71回大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Dynamic changes in microtubule structure observed on a time scale of seconds by X-ray fiber diffraction2018

    • Author(s)
      Kamimura S, Imai H, Yagi T & Iwamoto H
    • Organizer
      EMBL Symposium: Microtubules: From Atoms to Complex Systems
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Biochemical and structural characterization of taxoid microtubule-stabilizing agents2018

    • Author(s)
      Estevez-Gallego J, Kamimura S, Balaguer-Perez, F, Lucena-Agell D & Diaz J-F
    • Organizer
      EMBL Symposium: Microtubules: From Atoms to Complex Systems
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A new negative staining EM method at high protein concentration for sample evaluation of cryo-EM single particle analysis.2018

    • Author(s)
      H. Imai, E. Muto, T. Kon.
    • Organizer
      生理研究会
    • Related Report
      2018 Annual Research Report
  • [Presentation] How microtubules activate kinesin & dynein ATPase activity2018

    • Author(s)
      武藤悦子
    • Organizer
      62nd Annual meeting of Biophysical Society, USA
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Key molecular mechanism for the variable-sized steps of dynein2017

    • Author(s)
      武藤悦子
    • Organizer
      International Wordkshop of Dynein 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] How does cytoplasmic dynein stepping along microtubules look like?2017

    • Author(s)
      今井洋
    • Organizer
      International Wordkshop of Dynein 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited

URL: 

Published: 2017-04-28   Modified: 2021-12-27  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi