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Time-resolved structural analysis of tetanus toxin by Cryo-EM to elucidate the mechanism of membrane penetration

Research Project

Project/Area Number 23K23821
Project/Area Number (Other) 22H02557 (2022-2023)
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeMulti-year Fund (2024)
Single-year Grants (2022-2023)
Section一般
Review Section Basic Section 43020:Structural biochemistry-related
Research InstitutionOsaka University

Principal Investigator

Inoue Tsuyoshi  大阪大学, 大学院薬学研究科, 教授 (20263204)

Co-Investigator(Kenkyū-buntansha) 安居 輝人  北海道大学, 遺伝子病制御研究所, 博士研究員 (60283074)
Project Period (FY) 2024-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2024: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2023: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2022: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Keywords破傷風毒素 / クライオ電顕 / ダイナミクス / 抗体複合体 / 時分割解析 / 構造変化 / クライオ電子顕微鏡 / 低温トラップ
Outline of Research at the Start

破傷風毒素(TeNT)が中枢神経系の細胞でのみ作用する膜透過の分子機構について還元状態からS-S結合の形成に伴って膜透過ドメイン(Hn) が回転し、TeNTが活性型に変化する様子について、クライオ電顕を用いた低温トラップ法による時分割構造解析によって明らかとすることを目的として いる。また、ヒト由来の機能性抗体のエピトープも解析して、活性化メカニズムと抗体による不活化機構との相関を明らかとし、細胞膜侵入の分子機構解明を行う。

Outline of Final Research Achievements

Tetanus toxin (TeNT) is a potent neurotoxin that selectively targets the central nervous system, and elucidating its activation mechanism remains an important challenge. This study focused on the structural changes during membrane translocation, particularly the transition to a reduced state and the dissociation of disulfide bonds, and employed cryo-electron microscopy (cryo-EM) for analysis. Although the membrane-associated structures were diverse, the accumulation of sample preparation techniques and imaging conditions led to promising groundwork for future high-resolution studies. In parallel, the development of a visualization system using fluorescently labeled mutants and analysis of antibody-toxin complexes revealed part of the mechanism by which TeNT activation is suppressed. These findings are expected to contribute not only to the understanding of the CNS-specific activation mechanism of TeNT, but also to the development of effective neutralizing antibodies.

Academic Significance and Societal Importance of the Research Achievements

破傷風毒素(TeNT)は中枢神経特異的に作用する強力な神経毒である。本研究では、S-S結合の乖離を伴う膜透過時の構造変化に注目し、クライオ電顕での解析を進めた。膜上構造の多様性に対応する技術的基盤を整備し、今後の高分解能解析に繋がる成果を得た。さらに、蛍光変異体による局在可視化系の構築や、抗体複合体解析により活性化阻害機構の一端を明らかにした。

Report

(4 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Annual Research Report
  • 2022 Annual Research Report
  • Research Products

    (17 results)

All 2025 2024 2023 2022

All Journal Article (10 results) (of which Peer Reviewed: 10 results,  Open Access: 10 results) Presentation (2 results) (of which Invited: 2 results) Book (1 results) Patent(Industrial Property Rights) (4 results) (of which Overseas: 3 results)

  • [Journal Article] Sulfide Oxidation to Sulfone Using Sodium Chlorite and Hydrochloric Acid in Organic Solvents2025

    • Author(s)
      Itabashi Yuki、Ogata Shuto、Inoue Tsuyoshi、Asahara Haruyasu、Ohkubo Kei
    • Journal Title

      Molecules

      Volume: 30 Issue: 9 Pages: 1912-1912

    • DOI

      10.3390/molecules30091912

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Surface modification of polylactic acid using a photo-activated chlorine dioxide process: surface properties and dissimilar adhesion2025

    • Author(s)
      Asahara Haruyasu、Wu Weiting、Asoh Taka-Aki、Hsu Yu-I、Inoue Tsuyoshi、Uyama Hiroshi
    • Journal Title

      Materials Advances

      Volume: 6 Issue: 5 Pages: 1608-1612

    • DOI

      10.1039/d4ma01275e

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Characterization of a neutralizing antibody that recognizes a loop region adjacent to the receptor-binding interface of the SARS-CoV-2 spike receptor-binding domain.2024

    • Author(s)
      Anzai I, Fujita J, Ono C, Kosaka Y, Miyamoto Y, Shichinohe S, Takada K, Torii S, Taguwa S, Suzuki K, Makino F, Kajita T, Inoue T, Namba K, Watanabe T, Matsuura Y
    • Journal Title

      Microbiol Spectr.

      Volume: 12 Issue: 4

    • DOI

      10.1128/spectrum.03655-23

    • Related Report
      2024 Annual Research Report 2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Structures of a FtsZ single protofilament and a double-helical tube in complex with a monobody2023

    • Author(s)
      Junso Fujita, Hiroshi Amesaka, Takuya Yoshizawa, Kota Hibino, Natsuki Kamimura, Natsuko Kuroda, Takamoto Konishi, Yuki Kato, Mizuho Hara, Tsuyoshi Inoue, Keiichi Namba, Shun-ichi Tanaka, Hiroyoshi Matsumura
    • Journal Title

      Nature Communications

      Volume: 14 Issue: 1 Pages: 4073-4073

    • DOI

      10.1038/s41467-023-39807-5

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] One-step antibacterial modification of polypropylene nonwoven fabrics via oxidation using photo-activated chlorine dioxide radical2023

    • Author(s)
      Yamamoto Keita、Asahara Haruyasu、Harada Kazuo、Itabashi Yuki、Ohkubo Kei、Inoue Tsuyoshi
    • Journal Title

      Journal of Materials Chemistry B

      Volume: -- Issue: 23 Pages: 5101-5107

    • DOI

      10.1039/d3tb00586k

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Epoxidized graphene grid for highly efficient high-resolution cryoEM structural analysis2023

    • Author(s)
      Fujita Junso、Makino Fumiaki、Asahara Haruyasu、Moriguchi Maiko、Kumano Shota、Anzai Itsuki、Kishikawa Jun-ichi、Matsuura Yoshiharu、Kato Takayuki、Namba Keiichi、Inoue Tsuyoshi
    • Journal Title

      Scientific Reports

      Volume: 13 Issue: 1 Pages: 2279-2279

    • DOI

      10.1038/s41598-023-29396-0

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Immobilization of β-cyclodextrin onto polypropylene nonwoven fabric based on photooxidative surface modification2023

    • Author(s)
      Keita Yamamoto, Haruyasu Asahara, Maiko Moriguchi, Tsuyoshi Inoue
    • Journal Title

      Polymer Journal

      Volume: - Issue: 5 Pages: 599-605

    • DOI

      10.1038/s41428-022-00751-8

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A panel of nanobodies recognizing conserved hidden clefts of all SARS-CoV-2 spike variants including Omicron2022

    • Author(s)
      Ryota Maeda, Junso Fujita, Yoshinobu Konishi, Yasuhiro Kazuma, Hiroyuki Yamazaki, Itsuki Anzai, Tokiko Watanabe, Keishi Yamaguchi, Kazuki Kasai, Kayoko Nagata, Yutaro Yamaoka, Kei Miyakawa, Akihide Ryo, Kotaro Shirakawa, Kei Sato, Fumiaki Makino, Yoshiharu Matsuura, Tsuyoshi Inoue, Akihiro Imura, Keiichi Namba, Akifumi Takaori-Kondo
    • Journal Title

      Communications Biology

      Volume: 5 Issue: 1 Pages: 669-669

    • DOI

      10.1038/s42003-022-03630-3

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Visible-light-induced phosgenation of amines by chloroform oxygenation using chlorine dioxide2022

    • Author(s)
      Asahara Haruyasu、Takao Nozomi、Moriguchi Maiko、Inoue Tsuyoshi、Ohkubo Kei
    • Journal Title

      Chemical Communications

      Volume: 58 Issue: 42 Pages: 6176-6179

    • DOI

      10.1039/d2cc01336c

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Human antibody recognition and neutralization mode on the NTD and RBD domains of SARS-CoV-2 spike protein2022

    • Author(s)
      Otsubo Ryota、Minamitani Takeharu、Kobiyama Kouji、Fujita Junso、Ito Toshihiro、Ueno Shiori、Anzai Itsuki、Tanino Hiroki、Aoyama Hiroshi、Matsuura Yoshiharu、Namba Keiichi、Imadome Ken-Ichi、Ishii Ken J.、Tsumoto Kouhei、Kamitani Wataru、Yasui Teruhito
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 20120-20120

    • DOI

      10.1038/s41598-022-24730-4

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 除菌・消臭剤MA-Tの酸化制御技術を活用したクライオ電顕のツールの開発2022

    • Author(s)
      井上豪
    • Organizer
      第3回ファーマラボEXPO東京(東京ビッグサイト)
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 除菌消臭剤MA-Tのメカニズム解明に基づく酸化制御技術の開発とその応用2022

    • Author(s)
      井上豪
    • Organizer
      R022量子構造生物学委員会・第6回研究会(ミーティングスペースAP日本橋)
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Book] クライオ電子顕微鏡ハンドブック2023

    • Author(s)
      難波 啓一、加藤 貴之、牧野 文信
    • Total Pages
      460
    • Publisher
      エヌ・ティー・エス
    • ISBN
      9784860438043
    • Related Report
      2022 Annual Research Report
  • [Patent(Industrial Property Rights)] グラフェングリッド、グラフェングリッドの製造方法、構造解析対象物質の構造解析方法2023

    • Inventor(s)
      井上豪(筆頭)ほか7名
    • Industrial Property Rights Holder
      井上豪(筆頭)ほか7名
    • Industrial Property Rights Type
      特許
    • Filing Date
      2023
    • Related Report
      2022 Annual Research Report
  • [Patent(Industrial Property Rights)] グラフェングリッド、グラフェングリッドの製造方法、構造解析対象物質の構造解析方法2022

    • Inventor(s)
      井上豪(筆頭)ほか7名
    • Industrial Property Rights Holder
      井上豪(筆頭)ほか7名
    • Industrial Property Rights Type
      特許
    • Filing Date
      2022
    • Related Report
      2022 Annual Research Report
    • Overseas
  • [Patent(Industrial Property Rights)] グラフェングリッド、グラフェングリッドの製造方法、構造解析対象物質の構造解析方法2022

    • Inventor(s)
      井上豪(筆頭)ほか7名
    • Industrial Property Rights Holder
      井上豪(筆頭)ほか7名
    • Industrial Property Rights Type
      特許
    • Filing Date
      2022
    • Related Report
      2022 Annual Research Report
    • Overseas
  • [Patent(Industrial Property Rights)] グラフェングリッド、グラフェングリッドの製造方法、構造解析対象物質の構造解析方法2022

    • Inventor(s)
      井上豪(筆頭)ほか7名
    • Industrial Property Rights Holder
      井上豪(筆頭)ほか7名
    • Industrial Property Rights Type
      特許
    • Filing Date
      2022
    • Related Report
      2022 Annual Research Report
    • Overseas

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Published: 2022-04-19   Modified: 2026-01-16  

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