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Mechanisms of triplet microtubule assembly

Research Project

Project/Area Number 19K06749
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44040:Morphology and anatomical structure-related
Research InstitutionOkinawa Institute of Science and Technology Graduate University (2020-2023)
Hosei University (2019)

Principal Investigator

Nakazawa Yuki  沖縄科学技術大学院大学, サイエンステクノロジーグループ, サイエンス・アンド・テクノロジー・アソシエイト (50508851)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsトリプレット微小管 / 中心子 / 中心小体 / ダブレット微小管 / 鞭毛基部体 / γ-tubulin / 微小管 / 軸糸 / 鞭毛 / 繊毛 / 繊毛・鞭毛
Outline of Research at the Start

真核細胞の微小管システムのうち、微小管重合中心から伸長する動的な「細胞質微小管系」の形成機構については理解が進んでいる一方、中心子・繊毛軸糸に見られる安定な「トリプレット・ダブレット微小管」の 形成のメカニズムはほとんど分かっていない。本研究では、このトリプレット微小管メカニズムの解明のため、トリプレット微小管構造に異常を示すクラミドモナスの新規γ-tubulin突然変異株bld13、及び既存のトリプレット関連突然変異株を用い、網羅的に作成した多重変異株が形成するトリプレットの微細形態を解析すると同時に、各変異遺伝子産物間の相互作用を解析し、トリプレット形成の普遍的分子メカニズムの考察を行う。

Outline of Final Research Achievements

Compared to the "cytoplasmic microtubule system," whose assembly mechanism is now well understood, the assembly mechanism of the stable "triplet/doublet microtubules" found in the centrioles and ciliary axonemes is still largely unknown. To elucidate this mechanism, I used several novel and known Chlamydomonas mutants showing defects in the triplet microtubule structure and tried to analyze the function of each protein in the triplet assembly process and the interaction between the proteins based on the effects of each single and multiple mutations on the centriole structure. The results revealed a novel function of one of them in triplet assembly and the interactions among the others.

Academic Significance and Societal Importance of the Research Achievements

本研究で用いる変異株の多くが、他の生物においては見られない「部分的な」中心子・トリプレット構造の異常を持つ。この特徴を備えたクラミドモナス中心子突然変異株を用いた遺伝学的アプローチは全生物に先駆けて大きな成果を上げてきた。これまでの研究の蓄積によって安定な重要変異株が揃っていることに加え、本研究では最近単離した新規の突然変異株を複数組み合わせた解析を行なっており、このようなアプローチを行うことが可能なのは本研究のみである。本研究によって得られたトリプレット関連タンパク質の機能と互いの関係の知見により、トリプレット/ダブレットという普遍的な微小管構造の構築原理の一端を詳細に明らかにできた。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (11 results)

All 2024 2023 2021 2020 2019 Other

All Presentation (6 results) (of which Int'l Joint Research: 2 results) Remarks (5 results)

  • [Presentation] Dominant negative mutations in γ-tubulin cause partial loss of protofilaments in centriole triplet microtubules2024

    • Author(s)
      Yuki Nakazawa, Mao Horii, Akira Noga, Ken-ichi Wakabayashi, and Masafumi Hirono
    • Organizer
      21st International Union for Pure and Applied Biophysics and 62nd Biophysics Society of Japan
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 中心子微小管の数に異常をもつ新規クラミドモナス突然変異株の解析2023

    • Author(s)
      久保田 和音,苗加 彰, 季 佳慧,中澤 友紀, 豊岡 博子, 廣野 雅文
    • Organizer
      日本動物学会 第94回大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] A suppressor mutation of a Chlamydomonas cilia-less mutant suggests a novel role of Bld10p, an essential protein for centriole assembly2021

    • Author(s)
      Yuki Nakazawa, Madoka Hiraki, and Masafumi Hirono
    • Organizer
      第59回日本生物物理学会年会
    • Related Report
      2021 Research-status Report
  • [Presentation] Cellular localization of SAS6-L, a paralog of a flagellar basal body protein that self-assembles into a 9-fold symmetrical structure2021

    • Author(s)
      中澤友紀, 長尾真仁, 苗加彰, Manuel Hilbert, Michel O. Steinmetz, 廣野雅文
    • Organizer
      9回対称性の会合体を形成する中心子タンパク質 SAS-6 のパラログ SAS6-L の細胞内局在
    • Related Report
      2020 Research-status Report
  • [Presentation] γ-tubulin functions in assembling centriolar triplet microtubules2020

    • Author(s)
      Yuki Nakazawa, Mao Horii, Saki Watanabe, Moeko Otsuki, Akira Noga, Ken-ichi Wakabayashi, Masafumi Hirono
    • Organizer
      The 58th Annual Meeting of the Biophysical Society of Japan
    • Related Report
      2020 Research-status Report
  • [Presentation] Poc1 scaffolds the projections on the luminal side of centriolar microtubules and stabilizes inter-triplets and triplet-cartwheel connections2019

    • Author(s)
      Mikito Owa, Yuki Nakazawa, Toshiyuki Oda, Haru-aki Yanagisawa, Akira Noga, Takashi Yamano, Hiro Iguchi, Hideya Fukuzawa, Masahide Kikkawa and Masafumi Hirono
    • Organizer
      5th International Volvox Conference
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Remarks]

    • URL

      https://groups.oist.jp/stg/yuki-nakazawa

    • Related Report
      2023 Annual Research Report
  • [Remarks]

    • URL

      https://groups.oist.jp/stg/yuki-nakazawa

    • Related Report
      2021 Research-status Report
  • [Remarks]

    • URL

      https://groups.oist.jp/stg/yuki-nakazawa

    • Related Report
      2020 Research-status Report
  • [Remarks] 法政大学生命科学部 廣野雅文研究室

    • URL

      https://sites.google.com/view/hirono-lab

    • Related Report
      2019 Research-status Report
  • [Remarks]

    • URL

      https://scholar.google.com/citations?hl=en&user=wLKZTkcAAAAJ

    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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