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Mechanism of condensin I's action in mitotic chromosome assembly

Research Project

Project/Area Number 19K06499
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 43010:Molecular biology-related
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Kinoshita Kazuhisa  国立研究開発法人理化学研究所, 開拓研究本部, 専任研究員 (60447886)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords染色体 / 細胞周期 / 細胞分裂
Outline of Research at the Start

本研究の目的は、組換えサブユニットから再構成した複合体を用いてコンデンシンIの分子メカニズムを理解することにある。野生型と変異型の複合体をカエル卵抽出液の無細胞系に導入することにより、コンデンシンIの個々のサブユニットの役割と制御サブユニット間の機能的クロストークを明らかにする。さらに新規in vitroアッセイ系を確立し、染色体構築の過程をコンデンシンIの動態・作用機序という視点から分子解剖する。従来の研究手法では決して到達することができなかった深いレベルでの染色体構築の分子的基盤の解明を目指す。

Outline of Final Research Achievements

Condensin I is a five-subunit protein complex that plays a central role in mitotic chromosome assembly in eukaryotic cells. By using Xenopus egg extracts as a functional assay, we find that condensin I complexes harboring mutations in its kleisin subunit CAP-H produce chromosomes with confined axes in the presence of topoisomerase II and highly compact structures (termed “beans”) with condensin-positive central cores in its absence. The SMC ATPase cycle and CAP-D2 are essential for such hyper-compaction. Loop extrusion activities of the mutant complexes cannot explain the chromosomal defects they exhibit in Xenopus egg extracts, implying that a loop extrusion-independent mechanism contributes to condensin I-mediated chromosome assembly and shaping.

Academic Significance and Societal Importance of the Research Achievements

分裂期染色体の構築のメカニズムは、そのプロセス自体が細胞の生存に必須であるという本質的な性質のために解析方法が限られており未解明のままであった。本研究成果の意義は、技術的困難を克服し染色体構築に中心的役割を担うコンデンシンの分子作用機構を詳細に明らかにした点にある。本研究独自のアプローチによって新たに示された分子活性を組み入れた染色体構築の分子モデルを提唱しており、今後さらなる研究の発展が期待される。

Report

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

    (8 results)

All 2023 2022 2021 2019 Other

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

  • [Journal Article] Molecular dissection of condensin II-mediated chromosome assembly using in vitro assays2022

    • Author(s)
      M. M. Yoshida, K. Kinoshita, Y. Aizawa, S. Tane, D. Yamashita, K. Shintomi, and T. Hirano
    • Journal Title

      eLife

      Volume: 11

    • DOI

      10.7554/elife.78984

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Cell cycle-specific loading of condensin I is regulated by the N-terminal tail of its kleisin subunit2022

    • Author(s)
      S. Tane, K. Shintomi, K. Kinoshita, Y. Tsubota, M. M. Yoshida, T. Nishiyama, and T. Hirano
    • Journal Title

      eLife

      Volume: 11 Pages: 1-23

    • DOI

      10.7554/elife.84694

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A loop extrusion-independent mechanism contributes to condensin I-mediated chromosome shaping2022

    • Author(s)
      Kinoshita Kazuhisa、Tsubota Yuko、Tane Shoji、Aizawa Yuuki、Sakata Ryota、Takeuchi Kozo、Shintomi Keishi、Nishiyama Tomoko、Hirano Tatsuya
    • Journal Title

      Journal of Cell Biology

      Volume: 221 Issue: 3

    • DOI

      10.1083/jcb.202109016

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Structural basis of HEAT‐kleisin interactions in the human condensin I subcomplex2019

    • Author(s)
      Hara Kodai、Kinoshita Kazuhisa、Migita Tomoko、Murakami Kei、Shimizu Kenichiro、Takeuchi Kozo、Hirano Tatsuya、Hashimoto Hiroshi
    • Journal Title

      EMBO reports

      Volume: - Issue: 5

    • DOI

      10.15252/embr.201847183

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Mitotic chromosome shaping by the condensin complexes2023

    • Author(s)
      Kazuhisa Kinoshita
    • Organizer
      RIKEN Pioneering Project “Biology of Intracellular Environments” Workshop
    • Related Report
      2022 Annual Research Report
  • [Presentation] A loop extrusion-independent mechanism contributes to condensin I-mediated chromosome shaping2022

    • Author(s)
      Kazuhisa Kinoshita
    • Organizer
      Biological Symposium in National Institute of Genetics
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] コンデンシン間相互作用がループ押出しと拮抗して分裂期染色体を形づくる2021

    • Author(s)
      木下和久、坪田 侑子、田根 将志、相澤 由有希、坂田 凌大、竹内 康造、新冨 圭史、西山 朋子、平野達也
    • Organizer
      第39回染色体ワークショップ・第19回核ダイナミクス研究会
    • Related Report
      2021 Research-status Report
  • [Remarks] 理化学研究所 開拓研究本部 平野染色体ダイナミクス研究室

    • URL

      http://www2.riken.jp/chromdyna/index.html

    • Related Report
      2022 Annual Research Report

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Published: 2019-04-18   Modified: 2024-01-30  

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