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Elucidation of thermal fluctuation associated with structural transition from amorphous aggregation to amyloid fibrillation

Research Project

Project/Area Number 17K07363
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Biophysics
Research InstitutionOsaka University

Principal Investigator

SASAHARA KENJI  大阪大学, 蛋白質研究所, 特任講師(常勤) (20432495)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsアミロイド線維 / アミロイドーシス / 蛋白質凝集 / アミロイド / 蛋白質 / 揺らぎ / アモルファス凝集
Outline of Final Research Achievements

Using three types of proteins (hen lysozyme, β2-microglobulin, α-synuclein), the relation between structural fluctuation and amyloid fibril formation was examined. In the experimental system, the structural fluctuation of the proteins was regulated by the heating and the addition of polyphosphate. Upon binding of polyphosphate to the protein molecules, the protein solubility largely decreased, resulted in the structurally-fluctuated state of the protein molecules in the vicinity of solubility limit. It was found that amyloid fibril formation is efficiently induced from the fluctuated state through the perturbation such as agitation. The model of amyloid fibril formation based on the structural fluctuation of protein was presented.

Academic Significance and Societal Importance of the Research Achievements

蛋白質は、大きく二つの凝集体を形成する。規則構造を持たないアモルファス凝集と規則的なクロスβシート構造を持つアミロイド線維である。生体内でのアミロイド線維の沈着は、アルツハイマー病、パーキンソン病、Ⅱ型糖尿病、プリオン病など数々の深刻な病気に関わることで注目されている。本研究では、蛋白質の構造揺らぎに着目して、天然状態にある蛋白質がアミロイド線維を形成する機構、及びアモルファス凝集を回避してアミロイド線維が形成される機構を明らかにした。蛋白質の構造揺らぎの概念を導入した新たなアミロイド形成モデルを示した。結果は、アミロイド病の治療や予防に結び付き、また早期診断にも応用可能である

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (16 results)

All 2020 2019 2018 2017

All Journal Article (7 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 7 results,  Open Access: 5 results) Presentation (9 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Isoelectric point-amyloid formation of α-synuclein extends the generality of the solubility and supersaturation-limited mechanism2020

    • Author(s)
      Furukawa Koki、Aguirre Cesar、So Masatomo、Sasahara Kenji、Miyanoiri Yohei、Sakurai Kazumasa、Yamaguchi Keiichi、Ikenaka Kensuke、Mochizuki Hideki、Kardos Jozsef、Kawata Yasushi、Goto Yuji
    • Journal Title

      Current Research in Structural Biology

      Volume: 2 Pages: 35-44

    • DOI

      10.1016/j.crstbi.2020.03.001

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Heating during agitation of β2-microglobulin reveals that supersaturation breakdown is required for amyloid fibril formation at neutral pH2019

    • Author(s)
      Noji Masahiro、Sasahara Kenji、Yamaguchi Keiichi、So Masatomo、Sakurai Kazumasa、Kardos Jazsef、Naiki Hironobu、Goto Yuji
    • Journal Title

      Journal of Biological Chemistry

      Volume: 294 Issue: 43 Pages: 15826-15835

    • DOI

      10.1074/jbc.ra119.009971

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Possible mechanisms of polyphosphate-induced amyloid fibril formation of β2-microglobulin2019

    • Author(s)
      Zhang Chun-ming、Yamaguchi Keiichi、So Masatomo、Sasahara Kenji、Ito Toru、Yamamoto Suguru、Narita Ichiei、Kardos Jozsef、Naiki Hironobu、Goto Yuji
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 116 Issue: 26 Pages: 12833-12838

    • DOI

      10.1073/pnas.1819813116

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Polyphosphates diminish solubility of a globular protein and thereby promote amyloid aggregation2019

    • Author(s)
      Sasahara Kenji、Yamaguchi Keiichi、So Masatomo、Goto Yuji
    • Journal Title

      Journal of Biological Chemistry

      Volume: 294 Issue: 42 Pages: 15318-15329

    • DOI

      10.1074/jbc.ra119.008662

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Aggregation-phase diagrams of β2-microglobulin reveal temperature and salt effects on competitive formation of amyloids versus amorphous aggregates2018

    • Author(s)
      Masayuki Adachi, Masahiro Noji, Masatomo So, Kenji Sasahara, Jozsef Kardos, Hironobu Naiki, Yuji Goto
    • Journal Title

      Journal of Biological Chemistry

      Volume: 293 Issue: 38 Pages: 14775-14785

    • DOI

      10.1074/jbc.ra118.004683

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Heparin-dependent aggregation of hen egg white lysozyme reveals two distinct mechanisms of amyloid fibrillation2017

    • Author(s)
      Nitani Ayame、Muta Hiroya、Adachi Masayuki、So Masatomo、Sasahara Kenji、Sakurai Kazumasa、Chatani Eri、Naoe Kazumitsu、Ogi Hirotsugu、Hall Damien、Goto Yuji
    • Journal Title

      Journal of Biological Chemistry

      Volume: 292 Issue: 52 Pages: 21219-21230

    • DOI

      10.1074/jbc.m117.813097

    • NAID

      120006557632

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Membrane-mediated amyloid deposition of human islet amyloid polypeptide2017

    • Author(s)
      Sasahara Kenji
    • Journal Title

      Biophysical Reviews

      Volume: 10 Issue: 2 Pages: 453-462

    • DOI

      10.1007/s12551-017-0351-x

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Amyloid aggregation of α-synuclein in the vicinity of solubility limit modulated by polyphosphate2019

    • Author(s)
      Sasahara Kenji, Yamaguchi Keiichi, So Masatomo, Goto Yuji
    • Organizer
      Ulm Meeting - Biophysics of Amyloid Formation
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Amyloid aggregation of α-synuclein near solubility limit modulated by polyphosphate2019

    • Author(s)
      笹原健二、山口圭一、宗正智、河田康志、後藤祐児
    • Organizer
      第19回日本蛋白質科学会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Mechanism of polyphosphate-induced aggregation of a globular protein2019

    • Author(s)
      笹原健二、山口圭一、宗正智、後藤祐児
    • Organizer
      第92回日本生化学会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Polyphosphate-induced aggregation of hen lysozyme2019

    • Author(s)
      笹原健二、山口圭一、宗正智、後藤祐児
    • Organizer
      第57回日本生物物理学会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Amyloid aggregation of αsynuclein in the vicinity of solubility limit modulated by polyphosphate2019

    • Author(s)
      Sasahara Kenji, Yamaguchi Keiichi, So Masatomo, Goto Yuji
    • Organizer
      2019 Ulm Meeting - Biophysics of Amyloid Formation
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Competition between amyloid fibrillation and amorphous aggregation of αsynuclein2018

    • Author(s)
      笹原健二、山口圭一、宗正智、河田康志、後藤祐児
    • Organizer
      第18回日本蛋白質科学会年会
    • Related Report
      2018 Research-status Report
  • [Presentation] αシヌクレインアミロイド線維形成を促進及び抑制する溶液条件2018

    • Author(s)
      笹原健二、山口圭一、宗正智、後藤祐児
    • Organizer
      第6回日本アミロイドーシス研究会学術集会
    • Related Report
      2018 Research-status Report
  • [Presentation] 超音波照射によるαシヌクレインアミロイド核の伸長を促進する溶液条件2017

    • Author(s)
      笹原健二、山口圭一、宗正智、後藤祐児
    • Organizer
      第26回ソノケミストリー討論会
    • Related Report
      2017 Research-status Report
  • [Presentation] 超音波照射下におけるポリリン酸が促進するαシヌクレインのアミロイド線維形成2017

    • Author(s)
      山口圭一、藤川龍弥、宗正智、笹原健二、河田康志、後藤祐児
    • Organizer
      第26回ソノケミストリー討論会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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