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Analysis of the regulation of BmAgo3 phosphorylation

Research Project

Project/Area Number 19K06484
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 InstitutionThe University of Tokyo

Principal Investigator

Natsuko Izumi  東京大学, 定量生命科学研究所, 技術専門職員 (50579274)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
KeywordspiRNA / Siwi / BmAgo3 / Gtsf / Ago3 / リン酸化
Outline of Research at the Start

本研究は、カイコのPIWIタンパク質であるBmAgo3のリン酸化の意義を明らかにすることを目的とし、具体的には以下の3点の解析を行う。
(1)BmAgo3のリン酸化部位を質量分析により同定する。
(2)リン酸化部位の変異体を作製し、その挙動を野生型BmAgo3と比較する。
(3)BmAgo3のリン酸化を司るキナーゼを同定を試みる。
上記の解析を通じ、BmAgo3のリン酸化の意義、piRNA産生との関係を明らかにするとともにBmAgo3のリン酸化がどのように制御されているのかを解明する。

Outline of Final Research Achievements

In this study, we initially planned to analyze the regulation of BmAgo3 phosphorylation, but after the study was initiated, another group reported related results. Because of this, we changed the research topic and analyzed the BmAgo3 complex in the absence of Siwi, where the phosphorylation of BmAgo3 is enhanced. In this analysis, we found that Gtsf1L, a paralog of Gtsf1, one of evolutionarily conserved piRNA factors, accumulates in the BmAgo3 complex in the absence of Siwi. We obtained results suggesting that silkworm two Gtsf paralogs, Gtsf1 and Gtsf1L, independently function in the piRNA pathway by specifically interacting with Siwi and BmAgo3 respectively and promoting their target cleavage.

Academic Significance and Societal Importance of the Research Achievements

piRNAが産生できない動物個体は、配偶子形成が不全となり不妊となる。ヒトの無精子症においても、piRNA産生に関わる因子の変異が報告されてきており、piRNA産生の分子機構の解明は、不妊症の原因理解にもつながる社会的意義のある研究課題である。PIWIの標的切断はpiRNA産生の原動力となっていることから、本研究を契機に明らかとなった、カイコGtsfタンパク質によるPIWIの標的切断の促進は、piRNA産生機構の理解を大きく前進させるものといえる。

Report

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

    (3 results)

All 2021 2020

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

  • [Journal Article] Dynamic subcellular compartmentalization ensures the fidelity of piRNA biogenesis in silkworms2021

    • Author(s)
      Pui Yuen Chung, Keisuke Shoji, Natsuko Izumi, and Yukihide Tomari
    • Journal Title

      EMBO reports

      Volume: - Issue: 7

    • DOI

      10.15252/embr.202051342

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] RNase κ promotes robust piRNA production by generating 2',3'-cyclic phosphate-containing precursors.2021

    • Author(s)
      Shigematsu M, Kawamura T, Morichika K, Izumi N, Kiuchi T, Honda S, Pliatsika V, Matsubara R, Rigoutsos I, Katsuma S, Tomari Y, Kirino Y.
    • Journal Title

      Nat Commun.

      Volume: 12 Issue: 1 Pages: 4498-4498

    • DOI

      10.1038/s41467-021-24681-w

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Zucchini consensus motifs determine the mechanism of pre-piRNA production2020

    • Author(s)
      Izumi Natsuko、Shoji Keisuke、Suzuki Yutaka、Katsuma Susumu、Tomari Yukihide
    • Journal Title

      Nature

      Volume: 578 Issue: 7794 Pages: 311-316

    • DOI

      10.1038/s41586-020-1966-9

    • Related Report
      2019 Research-status Report
    • Peer Reviewed

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Published: 2019-04-18   Modified: 2023-01-30  

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