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Polyphosphate-dependent protein aggregation and its biological significance

Research Project

Project/Area Number 21K19224
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 43:Biology at molecular to cellular levels, and related fields
Research InstitutionOsaka University

Principal Investigator

Goto Yuji  大阪大学, 大学院工学研究科, 特任研究員 (40153770)

Co-Investigator(Kenkyū-buntansha) 八木 寿梓  鳥取大学, 工学研究科, 准教授 (10432494)
Project Period (FY) 2021-07-09 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2022: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2021: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywords蛋白質 / 生体分子 / 老化 / 蛋白質凝集 / アミロイド線維 / 過飽和 / 溶解度 / 相転移 / ポリリン酸 / 脳神経変性疾患 / 凝集 / 変性
Outline of Research at the Start

ポリリン酸は、リン酸が数十個以上、直鎖状に重合した高分子であり、細菌からヒトまで広く存在すると共に、食品添加物として普及している。他方、ポリリン酸は強い蛋白質凝集作用をもち、アミロイド線維の形成を促進することから、アミロイドーシスの発症、さらには老化を左右する因子である可能性がある。本研究では、ポリリン酸に依存したアミロイド線維形成の分子機構を研究し、ポリリン酸に依存した蛋白質凝集とその生理的意義を探索する。ポリリン酸は、生体における蛋白質恒常性の重要なバイオマーカーとなり、生命科学にインパクトをもたらす。

Outline of Final Research Achievements

Polyphosphate (polyP), consisting of up to 1,000 phosphoanhydride bond-linked phosphate monomers, is one of the most ancient, enigmatic, and negatively charged molecules in biology. Because polyP is present all around us, from cellular components to food additives, clarifying its effects and consequent biological roles will be important to further advance our understanding of amyloid fibrils and related topics. We studied the effects of polyP on amyloid fibril formation of beta2-microblobulin and alpha-synuclein and showed that amyloid fibril formation of both beta2-microblobulin and alpha-synuclein could be accelerated by counter anion-binding and preferential hydration at relatively lower and higher concentrations of polyP, respectively, depending on the chain length of polyP. On the other hand, although we challenged to prepare antibodies specific to polyP, we could not achieve the goal because the preparation of protein antigens with polyP attached was difficult.

Academic Significance and Societal Importance of the Research Achievements

ポリリン酸は無味無臭で強い保水効果をもつことから、食品、飲料に添加されている。他方、リン酸が高度に重合したポリリン酸は、蛋白質凝集、アミロイド線維形成を強く促進するなど、生命機能における意義や、食品添加物としての妥当性に懸念がある。本研究は、これらを追求するものであり、ポリリン酸の効果やその作用機構の基盤を明らかにすることができた。本研究の成果をもとにさらに生命機能における意義や、食品添加物としての妥当性をさらに追及することができれば、より安全で安心な社会の構築につながると期待できる。

Report

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

    (13 results)

All 2023 2022 2021 Other

All Int'l Joint Research (3 results) Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (4 results) (of which Int'l Joint Research: 3 results,  Invited: 4 results) Book (1 results) Remarks (1 results)

  • [Int'l Joint Research] エトバッシュローランド大学(ハンガリー)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] ミュンヘン工科大学(ドイツ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] ウーロンゴン大学(オーストラリア)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Mechanisms of polyphosphate-induced amyloid fibril formation triggered by breakdown of supersaturation2023

    • Author(s)
      Yamaguchi Keiichi、Nakajima Kichitaro、Goto Yuji
    • Journal Title

      Biophysics and Physicobiology

      Volume: 20 Issue: 1 Pages: n/a

    • DOI

      10.2142/biophysico.bppb-v20.0013

    • ISSN
      2189-4779
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Macromolecular crowding and supersaturation protect hemodialysis patients from the onset of dialysis-related amyloidosis2022

    • Author(s)
      Nakajima Kichitaro、Yamaguchi Keiichi、Noji Masahiro、Aguirre Cesar、Ikenaka Kensuke、Mochizuki Hideki、Zhou Lianjie、Ogi Hirotsugu、Ito Toru、Narita Ichiei、Gejyo Fumitake、Naiki Hironobu、Yamamoto Suguru、Goto Yuji
    • Journal Title

      Nature Communications

      Volume: 13 Issue: 1 Pages: 5689-5689

    • DOI

      10.1038/s41467-022-33247-3

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Supersaturation-Dependent Formation of Amyloid Fibrils2022

    • Author(s)
      Goto Yuji、Noji Masahiro、Nakajima Kichitaro、Yamaguchi Keiichi
    • Journal Title

      Molecules

      Volume: 27 Issue: 14 Pages: 4588-4588

    • DOI

      10.3390/molecules27144588

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] ポリリン酸が引き起こすアミロイド線維形成機構2021

    • Author(s)
      山口圭一、中島吉太郎、後藤祐児
    • Journal Title

      月刊「細胞」

      Volume: 53 (9) Pages: 571-574

    • NAID

      40022675454

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Breakdown of supersaturation barrier links protein folding to amyloid formation2023

    • Author(s)
      Yuji GOTO
    • Organizer
      Amyloid Symposium Munich 2023
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 蛋白質2022

    • Author(s)
      後藤祐児
    • Organizer
      第5回LLPS研究会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Linking protein folding and misfolding2022

    • Author(s)
      Yuji GOTO
    • Organizer
      ABA, APPA & TBS Joint Congress,
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Linking protein folding and misfolding under macromolecular crowding2022

    • Author(s)
      Yuji GOTO
    • Organizer
      Proteostasis & Disease Symposium 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Book] 生体分子環境の化学2023

    • Author(s)
      谷口正輝、馬場嘉信、浜地格、杉本直己、後藤祐児、中野明彦、柳田敏夫、原田慶恵、建石寿枝、三好大輔、田中成典、田中元雅、王子田彰夫、小松徹、田畑和仁、夏目敦至、新井敏、和沢鉄一、永井健治、佐々木裕次、他17名
    • Total Pages
      208
    • Publisher
      化学同人
    • ISBN
      9784759814057
    • Related Report
      2022 Annual Research Report
  • [Remarks] 大阪大学・工学研究科・マイクロソノケミストリー共同研究講座・後藤グループ

    • URL

      https://supersaturation.sakura.ne.jp/

    • Related Report
      2022 Annual Research Report

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Published: 2021-07-13   Modified: 2024-01-30  

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