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Structural basis for dynamic kinetochore assembly essential for chromosome segregation

Research Project

Project/Area Number 21K06048
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 43020:Structural biochemistry-related
Research InstitutionOsaka University

Principal Investigator

Ariyoshi Mariko  大阪大学, 大学院生命機能研究科, 特任助教(常勤) (80437243)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords染色体分配 / キネトコア / セントロメア / タンパク質複合体 / ヌクレオソーム / クライオ電顕 / CENP-A / 構造生物学 / 分子会合
Outline of Research at the Start

細胞分裂に伴う染色体分配は、遺伝情報の継承と維持を担う重要かつ動的な過程である。染色体分配は、染色体上のセントロメア領域に形成されるキネトコアと呼ばれる多数のタンパク質からなる超分子構造体によって制御されている。キネトコアには、染色体と染色体移動装置である紡錘体微小管を連結させ、両者の状態変化を伝達するタンパク質ネットワークが存在するが、その実体は未だ不明な点が多い。本研究では、セントロメアを認識し、キネトコアにおける分子会合の足場となるCENP-C及びCENP-LNタンパク質に着目し、主に生化学と構造生物学の手法を用いて、細胞周期の進行に伴うキネトコア形成制御の実体を明らかにする。

Outline of Final Research Achievements

Chromosome segregation is regulated by a supramolecular structure consisting of numerous proteins called kinetochores assembled in the centromere region on the chromosome. In this study, structural and functional properties of the CENP-C and KNL2 proteins, which play essential roles as scaffolds for molecular assembly in the functional kinetochore assembly, were investigated using biochemical and structural techniques. Firstly, using single-particle analysis with cryo-electron microscopy, we elucidated the structural basis of CENP-A nucleosome recognition by the cell cycle-dependent chicken KNL2 protein and proposed a new functional model. Secondly, we discovered that CENP-C undergoes highre-order self-assembly. We demonstrated that self-assembly of CENP-C is crucial for maintaining centromere structure.

Academic Significance and Societal Importance of the Research Achievements

正常な染色体分配を維持するためには、セントロメアに限定されたキネトコアの構築 (空間的制御) および細胞周期と厳密に同調した染色体と紡錘体微小管の連結(時間的制御)が必要である。従って、染色体分配の分子機構を理解するためには、セントロメアおよびキネトコアを構成する多様なタンパク質がどのようにネットワークを形成し、細胞周期のタイミングを見極め、協調的に機能しているのかを理解する必要がある。本研究の結果に基づいて提唱したCENP-CとKNL2に関する動的な機能モデルは、このような細胞周期と連動したキネトコア形成の動的制御機構の新しい概念として認められるものである。

Report

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

    (6 results)

All 2024 2023 2022

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

  • [Journal Article] Artificial tethering of constitutive centromere-associated network proteins induces CENP-A deposition without Knl2 in DT40 cells.2024

    • Author(s)
      Cao J, Hori T, Ariyoshi M, Fukagawa T
    • Journal Title

      J Cell Sci.

      Volume: 137 Issue: 3 Pages: 1-16

    • DOI

      10.1242/jcs.261639

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Structural evidence for protein-protein interaction between the non-canonical methyl-CpG-binding domain of SETDB proteins and C11orf462024

    • Author(s)
      Mahana Yutaka、Ariyoshi Mariko、Nozawa Ryu-Suke、Shibata Sachiko、Nagao Koji、Obuse Chikashi、Shirakawa Masahiro
    • Journal Title

      Structure

      Volume: 32 Issue: 3 Pages: 304-315.e5

    • DOI

      10.1016/j.str.2023.12.001

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] An updated view of the kinetochore architecture.2023

    • Author(s)
      Ariyoshi M, Fukagawa T
    • Journal Title

      Trends Genet.

      Volume: 39 Issue: 12 Pages: 941-953

    • DOI

      10.1016/j.tig.2023.09.003

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Centromere/kinetochore is assembled through CENP-C oligomerization2023

    • Author(s)
      Hara Masatoshi、Ariyoshi Mariko、Sano Tomoki、Nozawa Ryu-Suke、Shinkai Soya、Onami Shuichi、Jansen Isabelle、Hirota Toru、Fukagawa Tatsuo
    • Journal Title

      Molecular Cell

      Volume: 83 Issue: 13 Pages: 2188-2205.e13

    • DOI

      10.1016/j.molcel.2023.05.023

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The cryo‐EM structure of the CENP‐A nucleosome in complex with ggKNL22023

    • Author(s)
      Jiang Honghui、Ariyoshi Mariko、Hori Tetsuya、Watanabe Reito、Makino Fumiaki、Namba Keiichi、Fukagawa Tatsuo
    • Journal Title

      The EMBO Journal

      Volume: 42 Issue: 6

    • DOI

      10.15252/embj.2022111965

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] The cryo-EM structure of the CENP-A nucleosome in complex with KNL22022

    • Author(s)
      Hong Jiang, Mariko Ariyoshi, Reito Watanabe, Fumiaki Makino, Keiichi Namba, Tatsuo Fukagawa
    • Organizer
      第45回日本分子生物学会年会
    • Related Report
      2022 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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