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Analysis of the molecular mechanisms of connected events, nucleolar dynamics and nucleophagy mediated by vacuoles

Research Project

Project/Area Number 21H02475
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 44010:Cell biology-related
Research InstitutionShizuoka University

Principal Investigator

Ushimaru Takashi  静岡大学, 理学部, 教授 (50262788)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2023: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2022: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2021: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
Keywordsオートファジー / ヌクレオファジー / TORC1 / 核小体 / 栄養源飢餓 / rDNA / ラパマイシン / ミクロオートファジー / ミクロヌクレオファジー / ESCRT
Outline of Research at the Start

細胞が栄養源飢餓に陥ると、核が液胞(リソソーム)に接している部分NVJで陥没しヌクレオファジー(核を分解するオートファジー)により核小体タンパク質が分解される。その一方で、核小体内部にあるrDNA (rRNA遺伝子)領域を含め染色体は分解されない。研究代表者は、核小体タンパク質がNVJ部位に近づく一方で、rDNAはNVJから遠ざかることを見出した。本研究ではこの機構の解明を行う。

Outline of Final Research Achievements

(1) We found that phosphatidylinositol 3-kinase complex II and Cdc14 phosphatase promote and inhibit ESCRT-0 recruitment and microautophagy, respectively. (2) We identified Cdc14 phosphatase, topoisomerase II (Topo II), and Hmo1 as factors required for micronucleophagy and analyzed their mechanisms of action. (3) We analyzed and evaluated the effects of cell cycle and vacuolar division state on microautophagy and micronucleophagy. Some of these have already been reported in a paper, some are currently under preparation, and the rest will be analyzed and reported in a paper in the future.

Academic Significance and Societal Importance of the Research Achievements

マクロオートファジーに比べて、研究が遅れているミクロオートファジーの解析が本研究から明らかになってきた。さらに、ミクロオートファジーの中でも核を分解するミクロヌクレオファジーの分野で、当研究室は先導的な研究成果を発表している。特に、食われる側の核の内部での生理現象(染色体の動き)がミクロヌクレオファジーと連動する現象のより詳細な解析が本研究によりなされた。
神経細胞のような核膜崩壊が起こらない静止期細胞は核内に毒性をもつ変性タンパク質が蓄積しやすく、その機構とこれが関連するアルツハイマー病のような神経変性疾患の解明に役立つことが期待される。

Report

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

    (29 results)

All 2023 2022 2021

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 3 results) Presentation (22 results) (of which Int'l Joint Research: 2 results,  Invited: 3 results)

  • [Journal Article] Vacuolar fragmentation promotes fluxes of microautophagy and micronucleophagy but not of macroautophagy2022

    • Author(s)
      Tsuneyuki Takuma and Takashi Ushimaru
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 614 Pages: 161-168

    • DOI

      10.1016/j.bbrc.2022.05.021

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] nterphase chromosome condensation in nutrient-starved conditions requires Cdc14 and Hmo1, but not condensin, in yeast2022

    • Author(s)
      Yuri Takeichi, Tsuneyuki Takuma, Kotaro Ohara, Most Naoshia Tasnin, and Takashi Ushimaru
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 611 Pages: 46-52

    • DOI

      10.1016/j.bbrc.2022.04.078

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The PI3 kinase complex II-PI3P-Vps27 axis on vacuolar membranes is critical for microautophagy induction and nutrient stress adaptation2022

    • Author(s)
      Most Naoshia Tasnin, Kisara Ito, Haruko Katsuta, Tsuneyuki Takuma, Tasnuva Sharmin, and Takashi Ushimaru
    • Journal Title

      Journal of Molecular Biology

      Volume: 434 Issue: 2 Pages: 167360-167360

    • DOI

      10.1016/j.jmb.2021.167360

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] TORC1 inactivation promotes APC/C-dependent mitotic slippage in yeast and human cells2021

    • Author(s)
      Chihiro Yamada, Aya Morooka, Seira Miyazaki, Masayoshi Nagai, Satoru Mase, Kenji Iemura, Most Naoshia Tasnin, Tsuneyuki Takuma, Shotaro Nakamura, Shamsul Morshed, Naoki Koike, Md. Golam Mostofa, Muhammad Arifur Rahman, Tasnuva Sharmin, Haruko Katsuta, Kotaro Ohara, Kozo Tanaka, and Takashi Ushimaru
    • Journal Title

      iScience

      Volume: 25 Issue: 2 Pages: 103675-103675

    • DOI

      10.1016/j.isci.2021.103675

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Cdc14 phosphatase downmodulates ESCRT-0 complex formation on vacuolar membranes and microautophagy after TORC1 inactivation2021

    • Author(s)
      Tasnuva Sharmin, Shamsul Morshed, Most Naoshia Tasnin, Tsuneyuki Takuma, and Takashi Ushimaru
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 561 Pages: 158-164

    • DOI

      10.1016/j.bbrc.2021.05.021

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Sorting nexin Mdm1/SNX14 regulates nucleolar dynamics at the NVJ after TORC1 inactivation2021

    • Author(s)
      Sharmin Tasnuva、Takuma Tsuneyuki、Morshed Shamsul、Ushimaru Takashi
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 552 Pages: 1-8

    • DOI

      10.1016/j.bbrc.2021.03.033

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The vacuole controls nucleolar dynamics and micronucleophagy via the NVJ2021

    • Author(s)
      Tasnin Most Naoshia、Takuma Tsuneyuki、Sharmin Tasnuva、Morshed Shamsul、Ushimaru Takashi
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 550 Pages: 158-165

    • DOI

      10.1016/j.bbrc.2021.02.141

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] ミクロヌクレオファジーと核小体リモデリングの制御機構2023

    • Author(s)
      丑丸敬史、Most Naoshia Tasnin、宅間恒行、Md Imran Nur Manik
    • Organizer
      第15 回 オートファジー研究会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 出芽酵母タンパク質毒性ストレス下に対するPP2Aフォスファターゼの応答の解析2023

    • Author(s)
      東寛人、中村翔太郎、丑丸敬史
    • Organizer
      酵母遺伝学フォーラム第56回研究報告会
    • Related Report
      2023 Annual Research Report
  • [Presentation] タンパク質毒性ストレス下におけるTORC1局在変化の分子機構の解析2023

    • Author(s)
      髙橋佑嘉、大矢天音、秋月亮磨、丑丸敬史
    • Organizer
      酵母遺伝学フォーラム第56回研究報告会
    • Related Report
      2023 Annual Research Report
  • [Presentation] ミクロヌクレオファジーにおける脂質輸送タンパク質Vps13の役割の解析2023

    • Author(s)
      宅間恒行、丑丸敬史
    • Organizer
      酵母遺伝学フォーラム第56回研究報告会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 変性タンパク質集積におけるTORC1とPP2Aの役割2023

    • Author(s)
      丑丸敬史、東寛人、髙橋佑嘉
    • Organizer
      酵母遺伝学フォーラム第56回研究報告会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Osh1 is involved in micronucleophagy and nucleolar remodeling2023

    • Author(s)
      Md Imran Nur Manik, Takashi Ushimaru
    • Organizer
      酵母遺伝学フォーラム第56回研究報告会
    • Related Report
      2023 Annual Research Report
  • [Presentation] TORC1はタンパク質凝集体を制御する2022

    • Author(s)
      丑丸 敬史
    • Organizer
      第45回 日本分子生物学会年会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] A new factor involved in micronucleophagy and nucleolar remodeling in budding yeast2022

    • Author(s)
      Takashi Ushimaru
    • Organizer
      10th International Symposium on Autophagy
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Impacts of vacuolar fragmentation on autophagy2022

    • Author(s)
      Tsuneyuki Takuma and Takashi Ushimaru
    • Organizer
      10th International Symposium on Autophagy
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 出芽酵母TORC1のタンパク質毒性ストレスに応答してその局在を変化させる2022

    • Author(s)
      丑丸敬史、髙橋佑嘉、大矢天音、秋月亮磨
    • Organizer
      酵母遺伝学フォーラム第55回研究報告会
    • Related Report
      2022 Annual Research Report
  • [Presentation] DNAダメージによるTORC1の局在変化と複合体解体の解析2022

    • Author(s)
      保森浩太朗、勝田晴子、尾崎稜太、丑丸敬史
    • Organizer
      酵母遺伝学フォーラム第55回研究報告会
    • Related Report
      2022 Annual Research Report
  • [Presentation] タンパク質毒性ストレス下におけるTORC1局在変化の分子機構の解析2022

    • Author(s)
      髙橋佑嘉、大矢天音、秋月亮磨、丑丸敬史
    • Organizer
      酵母遺伝学フォーラム第55回研究報告会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 出芽酵母タンパク質毒性ストレス下に対するPP2Aフォスファターゼの応答の解析2022

    • Author(s)
      中村翔太郎、丑丸敬史
    • Organizer
      酵母遺伝学フォーラム第55回研究報告会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 液胞の断片化はミクロヌクレオファジー活性を促進する2022

    • Author(s)
      宅間恒行、丑丸敬史
    • Organizer
      酵母遺伝学フォーラム第55回研究報告会
    • Related Report
      2022 Annual Research Report
  • [Presentation] SUNタンパク質Mps3はTORC1不活性化後の核小体リモデリングを制御する2022

    • Author(s)
      市川理穂、丑丸敬史
    • Organizer
      酵母遺伝学フォーラム第55回研究報告会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Nuclear and vacuolar ESCRT collaboratively execute micronucleophagy2022

    • Author(s)
      Most Naoshia Tasnin, Tsuneyuki Takuma, Takashi Ushimaru
    • Organizer
      酵母遺伝学フォーラム第55回研究報告会
    • Related Report
      2022 Annual Research Report
  • [Presentation] ストレスセンサーとしてのTORC1の機能の解析2021

    • Author(s)
      丑丸 敬史、秋月亮磨、大矢天音
    • Organizer
      第44回 日本分子生物学会年会 (パシフィコ横浜)
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] NVJが制御する核小体局在移動とミクロヌクレオファジー2021

    • Author(s)
      丑丸 敬史、Most Naoshia Tasnin、Tasnuva Sharmin、Md. Golam Mostofa
    • Organizer
      第73回日本細胞生物学会大会(京都みやこめっせ)
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 飢餓下の出芽酵母における複数のNVJが核小体リモデリングに及ぼす影響の解析2021

    • Author(s)
      宅間恒行、丑丸敬史
    • Organizer
      酵母遺伝学フォーラム第54回研究報告会(Web開催)
    • Related Report
      2021 Annual Research Report
  • [Presentation] DNAダメージは出芽酵母TORC1の複合体解体を伴う局在変化をもたらす2021

    • Author(s)
      勝田晴子、尾崎稜太、丑丸敬史
    • Organizer
      酵母遺伝学フォーラム第54回研究報告会(Web開催)
    • Related Report
      2021 Annual Research Report
  • [Presentation] タンパク質毒性ストレス下におけるTORC1の局在移動と活性低下機構の解析2021

    • Author(s)
      大矢天音、秋月亮磨、丑丸敬史
    • Organizer
      酵母遺伝学フォーラム第54回研究報告会(Web開催)
    • Related Report
      2021 Annual Research Report
  • [Presentation] 出芽酵母M期における飢餓誘導性rDNA凝縮の分析2021

    • Author(s)
      大原公太郎、武市有莉、丑丸敬史
    • Organizer
      酵母遺伝学フォーラム第54回研究報告会(Web開催)
    • Related Report
      2021 Annual Research Report

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

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