• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study on phase separation to understand amyloid formation and development of additives

Research Project

Project/Area Number 22K19284
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 InstitutionUniversity of Tsukuba

Principal Investigator

Shiraki Kentaro  筑波大学, 数理物質系, 教授 (90334797)

Co-Investigator(Kenkyū-buntansha) 菅井 祥加  東京工業大学, 国際先駆研究機構, 特任助教 (10905566)
Project Period (FY) 2022-06-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Keywordsタンパク質 / 凝集 / 相分離 / アミロイド / 液滴 / 凝集体 / 添加剤 / 共溶質 / 生物学的相分離 / タンパク質凝集
Outline of Research at the Start

本研究では、タンパク質の凝集抑制剤や構造の安定化剤として開発されてきた共溶質が、プリオン様タンパク質の液滴やアミロイドの安定化に効果が見られるのかを調べる。共溶質として変性剤やオスモライト、カオトロープ、高分子、糖質など、特徴の異なるものを系統的に調べ、液滴や凝集体の形成に影響するメカニズムを明らかにする。液滴や凝集体の性質を顕微鏡や分光法で明らかにする。最終的に、アミロイドやアモルファル凝集体の形成が液滴を経由するのかを明らかにする。

Outline of Final Research Achievements

Proteins are characterised by their diverse states, including aggregation, phase separation, gelation and fibrilization. In particular, the change of state of proteins from droplets to aggregates has attracted much attention because it can lead to the elucidation of the causes of diseases. The aim of this study was to rationally control the phase separation and aggregation of proteins. Our results showed that they can be rationally understood by utilising phase diagrams. We also found that amyloid nucleation is slower in narrower spaces, that proteins folded into droplets become multiphase when they are incorporated, and that droplet size can be controlled by small molecule ATP.

Academic Significance and Societal Importance of the Research Achievements

本研究では、タンパク質の凝集と相分離の状態変化を、どうすれば合理的に理解し、制御できるのかというタンパク質に固有の難しい課題にチャレンジした。古典的な相図を用いることで、相分離した状態を安定に保つ条件と、凝集へと成熟する条件が見分けられることがわかった。このようなタンパク質の凝集と相分離のメカニズムの理解が深まれば、バイオ医薬品の安定化や、食品タンパク質の性質の制御など、タンパク質に関連する産業に広く役立つ情報を提供できる。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (5 results)

All 2024 2023

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (2 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Journal Article] Interfacial and intrinsic molecular effects on the phase separation/transition of heteroprotein condensates2024

    • Author(s)
      Nobeyama Tomohiro、Yoshida Toya、Shiraki Kentaro
    • Journal Title

      International Journal of Biological Macromolecules

      Volume: 254 Pages: 128095-128095

    • DOI

      10.1016/j.ijbiomac.2023.128095

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Detection of Fibril Nucleation in Micrometer-Sized Protein Condensates and Suppression of Sup35NM Fibril Nucleation by Liquid-Liquid Phase Separation2023

    • Author(s)
      Fukuyama Mao、Nishinami Suguru、Maruyama Yoko、Ozawa Taiki、Tomita Shunsuke、Ohhashi Yumiko、Kasuya Motohiro、Gen Masao、Chatani Eri、Shiraki Kentaro、Hibara Akihide
    • Journal Title

      Analytical Chemistry

      Volume: 95 Issue: 26 Pages: 9855-9862

    • DOI

      10.1021/acs.analchem.3c00766

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Phase-Diagram Observation of Liquid-Liquid Phase Separation in the Poly-l-Lys/ATP System and a Proposal for Diagram-Based Application Strategy2023

    • Author(s)
      Nobeyama Tomohiro、Furuki Tomohiro、Shiraki Kentaro
    • Journal Title

      Langmuir

      Volume: 39 Issue: 48 Pages: 17043-17049

    • DOI

      10.1021/acs.langmuir.3c01640

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Presentation] Control of protein aggregation by small additives2023

    • Author(s)
      Kentaro Shiraki
    • Organizer
      International Powder and Nanotechnology Forum 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 相分離生物学の基礎としてのタンパク質の凝集や相分離2023

    • Author(s)
      白木賢太郎
    • Organizer
      関東高分子若手研究会2023
    • Related Report
      2023 Annual Research Report
    • Invited

URL: 

Published: 2022-07-05   Modified: 2025-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi