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Elucidation of the mechanism of action of bacterial non-coding RNAs and its application for new drug discovery

Research Project

Project/Area Number 20K21281
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 38:Agricultural chemistry and related fields
Research InstitutionKyushu University

Principal Investigator

Numata Tomoyuki  九州大学, 農学研究院, 准教授 (10401564)

Project Period (FY) 2020-07-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2022: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords非コードRNA / リボスイッチ / 遺伝子の発現調節 / 細菌 / PreQ1 / tRNA / RNA合成 / 化学プローブ / クロスリンク / 修飾ヌクレオシド / 抗生剤 / 遺伝子発現調節 / バクテリア / 合成化合物
Outline of Research at the Start

ジベンゾフラン環化合物と結合したpreQ1リボスイッチの立体構造に基づき、転写抑制活性が向上する第2世代の合成化合物を取得する。これまでに、ジベンゾフラン環化合物を基盤にして誘導体を合成した。今後、合成化合物の遺伝子発現抑制活性を測定する。また、リボスイッチとの複合体結晶を作製し、その構造を解析する。得られた複合体構造を基盤にして誘導体を設計する。このサイクルを繰り返し転写抑制活性が高い合成化合物を取得して、新規な抗生剤候補物質を作製する。また、in vivoにおける合成化合物の活性評価系を構築する。さらに、リボスイッチが遺伝子の発現を調節するしくみを解明するために機能構造解析を推進する。

Outline of Final Research Achievements

In this study, I synthesized derivatives based on the chemical structure of the parent compound with dibenzofuran ring. Then, I evaluated the transcription termination activities of these derivatives by in vitro transcription assay using RNA polymerase. The resulting transcription termination activities of two of these new compounds were increased compared with the parent compound. The crystal structures of PreQ1 riboswitch in complex with these two compounds were determined by molecular replacement method. The structures revealed that the derivatives bound to the PreQ1 binding site of the riboswitch. In the crystal structures, the derivatives were stabilized by the stacking interactions with the conserved nucleobases of PreQ1 riboswitch. In addition, the structure revealed that the derivatives form specific hydrogen bonds with the nucleobases of PreQ1 riboswitch.

Academic Significance and Societal Importance of the Research Achievements

感染症に対する医薬品は低分子医薬が主流であるが、多剤耐性菌が出現し問題となっている。この克服には新規な抗生剤の開発が不可欠である。本研究では、細菌RNAを標的とした新規薬剤の創製を目指して実験を実施した。対象としたRNAは細菌に特有のPreQ1リボスイッチであり、PreQ1の生合成に関わる遺伝子の発現をPreQ1濃度に応じて調節する。PreQ1はtRNAのアンチコドン1字目に存在する修飾ヌクレオシドの一つであるキューオシンの前駆体であり、正確なタンパク質の合成に重要である。従って、PreQ1リボスイッチと結合する合成化合物を取得すれば、RNAを標的とした新規抗生剤の開発に繋がると考えられる。

Report

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

    (6 results)

All 2022 2021 Other

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

  • [Int'l Joint Research] NCI/NIH(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] NIH(米国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Family D DNA polymerase interacts with GINS to promote CMG-helicase in the archaeal replisome.2022

    • Author(s)
      Oki, K., Nagata, M., Yamagami, T., Numata, T., Ishino, S., Oyama, O., and Ishino, Y.
    • Journal Title

      Nucleic Acids Res.

      Volume: 50 Issue: 7 Pages: 3601-3615

    • DOI

      10.1093/nar/gkab799

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A chemical probe based on the PreQ1 metabolite enables transcriptome-wide mapping of binding sites2021

    • Author(s)
      Balaratnam, S., Rhodes, C., Bume, D.D., Connelly, C.M., Lai, C.C., Kelley, J.A., Yazdani, K., Homan, P.J., Incarnato, D., Numata, T. and Schneekloth, J.S. Jr.
    • Journal Title

      Nat. Commun.

      Volume: 12 Issue: 1 Pages: 5856-5856

    • DOI

      10.1038/s41467-021-25973-x

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] DNA polymerase D temporarily connects primase to the CMG-like helicase before interacting with proliferating cell nuclear antigen2021

    • Author(s)
      Oki Keisuke、Yamagami Takeshi、Nagata Mariko、Mayanagi Kouta、Shirai Tsuyoshi、Adachi Naruhiko、Numata Tomoyuki、Ishino Sonoko、Ishino Yoshizumi
    • Journal Title

      Nucleic Acids Research

      Volume: 49 Issue: 8 Pages: 4599-4612

    • DOI

      10.1093/nar/gkab243

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Minimal protein-only RNase P structure reveals insights into tRNA precursor recognition and catalysis2021

    • Author(s)
      Teramoto Takamasa、Koyasu Takeshi、Adachi Naruhiko、Kawasaki Masato、Moriya Toshio、Numata Tomoyuki、Senda Toshiya、Kakuta Yoshimitsu
    • Journal Title

      Journal of Biological Chemistry

      Volume: 297 Issue: 3 Pages: 101028-101028

    • DOI

      10.1016/j.jbc.2021.101028

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access

URL: 

Published: 2020-08-03   Modified: 2024-01-30  

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