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Biosynthesis and function of a novel tRNA modification ectopically acquired by a disease associated mutation

Research Project

Project/Area Number 20K21243
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 37:Biomolecular chemistry and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Suzuki Takeo  東京大学, 大学院工学系研究科(工学部), 講師 (90533125)

Project Period (FY) 2020-07-30 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
KeywordstRNA / ミトコンドリア / 点変異 / 遺伝暗号解読 / 疾患
Outline of Research at the Start

ミトコンドリア内部で転写される転移RNA(tRNA)への転写後修飾は、tRNAが機能を持つために重要な過程であるため、修飾の欠損は一般に疾患の要因となる。今回、tRNAへの疾患関連点変異により、点変異部位とは異なる、本来正常な配列と言える部位に新規修飾が獲得されることを見出した。この新規修飾について生合成機構や特に遺伝暗号解読における役割の解明を目指す。得られる研究成果は、既往の修飾「欠損」疾患とは全く逆の、修飾「獲得」疾患の初めての例証になる可能性があるだけでなく、疾患のメカニズムの一端が明らかになることで、疾患の予防や克服に向けた応用へとつながることも期待している。

Outline of Final Research Achievements

Structural analyses enabled us to predict a chemical structure of the novel modification found in human mitochondrial tRNA-Met with a pathogenic point mutation. We also predict a modifying enzyme based on the structure and demonstrated that the enzyme can reconstitute the modification in cells by over expression and in vitro by using recombinant protein. To perform ribosome binding assay for measurement of the modification’s decoding ability, we optimized the reaction condition of the assay by using anticodon stem-loop (ASL) as a model tRNA substrate. Although the binding efficiency still did not increase much, the assay condition was finally determined.

Academic Significance and Societal Importance of the Research Achievements

疾患点変異に伴い変異部位と異なる位置に新たに獲得されたRNA修飾は、新規な化学構造を持っていた。このことはヒトにおけるRNA修飾の構造や機能の多様性を表していると言える。当該修飾は疾患を亢進する役割を持つと考えらえることから、今回特定された生合成経路を阻害することが、点変異に起因する疾患の治療や予防につながるといった応用が機体される。

Report

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

    (10 results)

All 2021 2020 Other

All Journal Article (7 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (2 results) Remarks (1 results)

  • [Journal Article] Mass spectrometric analysis of mRNA 5′ terminal modifications2021

    • Author(s)
      Akichika, S., Suzuki, T., Suzuki, T.
    • Journal Title

      Methods Enzymol

      Volume: 658 Pages: 407-418

    • DOI

      10.1016/bs.mie.2021.06.012

    • ISBN
      9780128235850
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] RNA修飾と疾患2021

    • Author(s)
      鈴木 健夫、鈴木 勉
    • Journal Title

      月刊「細胞」

      Volume: 53 Pages: 880-883

    • Related Report
      2021 Annual Research Report
  • [Journal Article] N6-methyladenosine (m6A) is an endogenous A3 adenosine receptor ligand2021

    • Author(s)
      Ogawa Akiko、Nagiri Chisae、Shihoya Wataru、Inoue Asuka、Kawakami Kouki、Hiratsuka Suzune、Aoki Junken、Ito Yasuhiro、Suzuki Takeo、Suzuki Tsutomu、Inoue Toshihiro、Nureki Osamu、Tanihara Hidenobu、Tomizawa Kazuhito、Wei Fan-Yan
    • Journal Title

      Molecular Cell

      Volume: 81 Issue: 4 Pages: 674-674

    • DOI

      10.1016/j.molcel.2020.12.038

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Loss of Ftsj1 perturbs codon-specific translation efficiency in the brain and is associated with X-linked intellectual disability2021

    • Author(s)
      Nagayoshi Y.、Chujo T.、Hirata S.、Nakatsuka H.、Chen C.-W.、Takakura M.、Miyauchi K.、Ikeuchi Y.、Carlyle B. C.、Kitchen R. R.、Suzuki T.、Katsuoka F.、Yamamoto M.、Goto Y.、Tanaka M.、Natsume K.、Nairn A. C.、Suzuki T.、Tomizawa K.、Wei F.-Y.
    • Journal Title

      Science Advances

      Volume: 7 Issue: 13

    • DOI

      10.1126/sciadv.abf3072

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Complete chemical structures of human mitochondrial tRNAs2020

    • Author(s)
      Suzuki Takeo、Yashiro Yuka、Kikuchi Ittoku、Ishigami Yuma、Saito Hironori、Matsuzawa Ikuya、Okada Shunpei、Mito Mari、Iwasaki Shintaro、Ma Ding、Zhao Xuewei、Asano Kana、Lin Huan、Kirino Yohei、Sakaguchi Yuriko、Suzuki Tsutomu
    • Journal Title

      Nature Communications

      Volume: 11 Issue: 1 Pages: 1-15

    • DOI

      10.1038/s41467-020-18068-6

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Mass Spectrometric Analysis of Mitochondrial RNA Modifications2020

    • Author(s)
      Ishigami Yuma、Suzuki Tsutomu、Suzuki Takeo
    • Journal Title

      Methods in Molecular Biology

      Volume: 2192 Pages: 89-101

    • DOI

      10.1007/978-1-0716-0834-0_8

    • ISBN
      9781071608333, 9781071608340
    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] ミトコンドリアtRNA修飾とミトコンドリア病2020

    • Author(s)
      鈴木健夫
    • Journal Title

      遺伝子医学MOOK 35号 ミトコンドリアと病気

      Volume: 35 Pages: 268-274

    • Related Report
      2020 Research-status Report
  • [Presentation] Restoration of mitochondrial function through activation of hypomodified tRNAs with pathogenic mutations associated with mitochondrial diseases2021

    • Author(s)
      Tomoda, E., Nagao, A., Shirai, Y., Suzuki, T., Brendan, B., Suzuki, T.
    • Organizer
      44th Annual meeting of the MBSJ
    • Related Report
      2021 Annual Research Report
  • [Presentation] Identification and characterization of novel tRNA methyltransferases in higher eukaryotes2021

    • Author(s)
      Mineo, A., Akichika, S., Sakaguchi, Y., Shichino, Y., Mito, M., Iwasaki, S., Suzuki, T., Suzuki, T.
    • Organizer
      44th Annual meeting of the MBSJ
    • Related Report
      2021 Annual Research Report
  • [Remarks] ヒトミトコンドリアtRNA修飾の全体像を解明―RNA修飾異常疾患の究明へ大きな前進

    • URL

      https://www.t.u-tokyo.ac.jp/foe/press/setnws_202008311155455788959888.html

    • Related Report
      2020 Research-status Report

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Published: 2020-08-03   Modified: 2023-01-30  

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