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Functional analyses of unknown factors related to meningococcal pathogenesis with unnatural amino acids

Research Project

Project/Area Number 19K07550
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 49050:Bacteriology-related
Research InstitutionNational Institute of Infectious Diseases

Principal Investigator

Takahashi Hideyuki  国立感染症研究所, 細菌第一部, 室長 (60321866)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords髄膜炎菌 / 侵襲性感染症 / 非天然アミノ酸 / 病原性因子 / 機能未知 / 外膜タンパク / クロスリンク / 線毛 / 感染 / Neisseria meningitides / 病原性 / PamA / クロスリンカー / Methanosarcina mazei / Neisseria meningitidis / 機能未知因子 / 遺伝暗号拡張
Outline of Research at the Start

髄膜炎菌の既知病原因子は全て細菌表面に局在しているが、それらの因子のみでは髄膜炎菌の病原性の発症機序の全てを説明するのは困難であり、未解明因子の存在が示唆されている。一方で、髄膜炎菌ゲノム解読によって同定されたタンパク因子の 約 30 % は機能未知因子 (hypothetical protein、以下 HP 因子) であり、遺伝学的解析からそれらのHP因子が髄膜炎菌の病原性に大きく寄与していることを見出している。そこで本研究では非天然型アミノ酸導入法を髄膜炎菌に適用し、その HP 因子群と相互作用する因子群を髄膜炎菌 in vivo で網羅的に探索・同定し、 HP 因子群の機能解析を行なう。

Outline of Final Research Achievements

Our previous genetic analyses revealed that the hypothetical protein, NMB1345, plays a crucial role in meningococcal infection in human brain microvascular endothelial cells; In the present study, we developed a new method to genetically incorporate ncAAs-encoded photocrosslinking probes into N. meningitidis by utilizing a pyrrolysyl-tRNA synthetase/tRNAPyl pair and elucidated the biological function(s) of the NMB1345 protein. The results revealed that the NMB1345 protein directly interacts with PilE, a major component of meningococcal pili, and further physicochemical and genetic analyses showed that the interaction between the NMB1345 protein and PilE was important for both functional pilus formation and meningococcal infectious ability in N. meningitidis. The present study using this new methodology for N. meningitidis provides novel insights into meningococcal pathogenesis by assigning the function of a hypothetical protein.

Academic Significance and Societal Importance of the Research Achievements

機能未知な髄膜炎菌の病原性因子の機能を解明することにより、新たな髄膜炎菌の病原性機構の分子機序を明らかにし、新規の髄膜炎菌感染症の治療薬の開発の礎を基礎研究側から提供出来ることが期待される。

Report

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

    (14 results)

All 2022 2021 2020 2019 Other

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

  • [Int'l Joint Research] Johns Hopkins University(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Johns Hopkins University(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Genetic characterization of clonal complex sequence type 2057 (cc2057) serogroup B Neisseria meningitidis strains unique to Japan and identification of a capsular-switched serogroup Y isolate cc20572022

    • Author(s)
      Hideyuki Takahashi, Masatomo Morita, Hajime Kamiya, Haruna Nakamura-Miwa, Ken Shimuta, and Makoto Ohnishi
    • Journal Title

      Journal of Medical Microbiology

      Volume: 71 Issue: 3 Pages: 001504-001504

    • DOI

      10.1099/jmm.0.001504

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Serogroup B invasive meningococcal disease (IMD) outbreak at a Japanese high school dormitory: An outbreak investigation report from the first IMD outbreak in decades2021

    • Author(s)
      Noritaka Sekiya, Tomimasa Sunagawa, Hideyuki Takahashi, Hajime Kamiya, Shuji Yoshino, Makoto Ohnishi, Nobuhiko Okabe, Kiyosu Taniguchi
    • Journal Title

      Vaccine

      Volume: 39 Issue: 15 Pages: 2177-2182

    • DOI

      10.1016/j.vaccine.2021.02.034

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Characterization of two Neisseria gonorrhoeae strains with high-level azithromycin resistance isolated in 2015 and 2018 in Japan2020

    • Author(s)
      Shimuta Ken、Lee Kenichi、Yasuda Mitsuru、Furubayashi Keiichi、Uchida Chiaki、Nakayama Shu-ichi、Takahashi Hideyuki、Ohnishi Makoto
    • Journal Title

      Sexually Transmitted Diseases

      Volume: Publish Ahead of Print Issue: 7 Pages: 1-5

    • DOI

      10.1097/olq.0000000000001303

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Genetic incorporation of non-canonical amino acids photocrosslinkers in Neisseria meningitidis: New method provides insights into the physiological function of the function-unknown NMB1345 protein.2020

    • Author(s)
      Takahashi H, Dohmae N, Kim KS, Shimuta K, Ohnishi M, Yokoyama S, Yanagisawa T.
    • Journal Title

      PLoS ONE

      Volume: 15 Issue: 8 Pages: e0237883-e0237883

    • DOI

      10.1371/journal.pone.0237883

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A Loop-Mediated Isothermal Amplification Assay Targeting Neisseria Gonorrhoeae penA-60.0012019

    • Author(s)
      Ken Shimuta, Shu-Ichi Nakayama, Hideyuki Takahashi, Makoto Ohnishi
    • Journal Title

      Antimicrob Agents Chemother .

      Volume: 64 Issue: 1

    • DOI

      10.1128/aac.01663-19

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Genetic incorporation of non-canonical amino acid photocrosslinkers in Neisseria meningitidis provides insights into the physiological function of the function-unknown protein.2022

    • Author(s)
      Hideyuki Takahashi, Makoto Ohnishi, Ken Shimuta, Shigeyuki Yokoyama, Tatsuo Yanagisawa
    • Organizer
      第95回日本細菌学会総会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 「マスギャザリングと感染症事例から学ぶ」侵襲性髄膜炎菌感染症2020

    • Author(s)
      高橋英之
    • Organizer
      第94会日本感染症学会総会
    • Related Report
      2020 Research-status Report
  • [Presentation] 非天然アミノ酸を導入した髄膜炎菌における遺伝暗号拡張2020

    • Author(s)
      高橋英之、大西真、横山茂之、柳沢達男
    • Organizer
      第93回日本細菌学会総会
    • Related Report
      2019 Research-status Report
  • [Presentation] マスギャザリングと髄膜炎菌感染症2020

    • Author(s)
      高橋英之
    • Organizer
      第32回地方衛生研究所全国協議会関東甲信静支部細菌研究部会総会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 髄膜炎菌Neisseria meningitidis の宿主細胞感染時におけるNutrient virulence factor としてのシステイン輸送システムの機能解析2019

    • Author(s)
      高橋英之、横山茂之、柳沢達男
    • Organizer
      第92回日本細菌学会総会
    • Related Report
      2019 Research-status Report
  • [Book] 臨床と微生物 「侵襲性髄膜炎菌感染症」2020

    • Author(s)
      高橋英之、大西真
    • Total Pages
      5
    • Publisher
      近代出版
    • ISBN
      9784874022634
    • Related Report
      2020 Research-status Report
  • [Book] 小児疾患診療のための病態生理1 「侵襲性髄膜炎菌感染症」2020

    • Author(s)
      高橋英之、大西真
    • Total Pages
      5
    • Publisher
      東京医学社
    • Related Report
      2020 Research-status Report

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

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