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

Identification of regulators of macropinocytosis by a genome-wide CRISPR/Cas9 screen

Research Project

Project/Area Number 20K06636
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44010:Cell biology-related
Research InstitutionThe University of Tokyo

Principal Investigator

Sakamaki Jun-ichi  東京大学, 大学院医学系研究科(医学部), 特任助教 (10825938)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsマクロピノサイトーシス / CRISPR-Cas9 / ユビキチン / リン脂質 / オートファジー / CRISPR-Cas9システム / 膵管腺がん
Outline of Research at the Start

マクロピノサイトーシスは細胞外液に含まれる高分子を細胞内に取り込み、分解する機構である。この機構はがん細胞で活性化しており、その生存と増殖のためのエネルギー供給源となっていることが示唆されている。しかし、この経路の分子制御機構は未だ不明な点が多く、特異的な阻害法が確立していない。本研究では、CRISPR-Cas9システムを用いたゲノムワイドスクリーニングによるマクロピノサイトーシス制御遺伝子の網羅的探索を行い、同定した特異的制御因子の不活性化ががん細胞の増殖を抑制するのか調べることで、マクロピノサイトーシスが実際にがんの増殖に寄与し、抗がん剤開発の標的となりうるか検証する。

Outline of Final Research Achievements

Macropinocytosis is a process that delivers extracellular molecules to lysosomes for degradation. To identify novel regulators of micropinocytosis, I performed a genome-wide CRISPR-Cas9 screen using fluorescent labeled albumin.
I also focused on the regulatory mechanism of organellar function and dynamics. I have discovered that the phospholipid phosphatidylethanolamine is ubiquitinated in eukaryotic cells (Sakamaki J et al. Mol Cell 2022).
To identify negative regulators of autophagy, we performed a genome-wide CRISPR-Cas9 screen using the quantitative autophagic flux reporter GFP-LC3-RFP. We found that knockout of the purine synthesis enzyme PFAS activates autophagy and purine nucleoside synthesis negatively regulates autophagy (Mimura, Sakamaki, et al. J Biol Chem. 2021).

Academic Significance and Societal Importance of the Research Achievements

ユビキチンとタンパク質の共有結合は真核細胞で普遍的に見られる修飾反応である。ユビキチン化は標的タンパク質の分解や性質の変化をもたらすシグナルとして働き、細胞の恒常性を維持する上で重要な働きを担っている。この機構の破綻はがん、神経変性、感染症などの疾患に関連することが示唆されている。ユビキチン化の標的は長らくタンパク質のみであると考えられてきたが、本研究ではオルガネラ膜を構成するリン脂質であるホスファチジルエタノールアミンがユビキチン化されることを明らかにした。多くの生命現象や疾患に関連することが知られているユビキチンの全く新しい機能を解明し、ユビキチン化修飾の概念や考え方を変える新発見である。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (18 results)

All 2023 2022 2021

All Journal Article (10 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 9 results,  Open Access: 7 results) Presentation (8 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Protocol to purify and detect ubiquitinated phospholipids in budding yeast and human cell lines2023

    • Author(s)
      Sakamaki Jun-ichi、Mizushima Noboru
    • Journal Title

      STAR Protocols

      Volume: 4 Issue: 1 Pages: 101935-101935

    • DOI

      10.1016/j.xpro.2022.101935

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The pH-sensing Rim101 pathway regulates cell size in budding yeast2023

    • Author(s)
      Shimasawa Masaru、Sakamaki Jun-ichi、Maeda Tatsuya、Mizushima Noboru
    • Journal Title

      Journal of Biological Chemistry

      Volume: 299 Issue: 3 Pages: 102973-102973

    • DOI

      10.1016/j.jbc.2023.102973

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Cell biology of protein–lipid conjugation2023

    • Author(s)
      Sakamaki Jun-ichi、Mizushima Noboru
    • Journal Title

      Cell Structure and Function

      Volume: 48 Issue: 1 Pages: 99-112

    • DOI

      10.1247/csf.23016

    • ISSN
      0386-7196, 1347-3700
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 細胞小器官の膜リン脂質のユビキチン化2023

    • Author(s)
      坂巻純一、水島昇
    • Volume
      41
    • Pages
      437
    • DOI

      10.18958/7189-00003-0000377-00

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Ubiquitination of phosphatidylethanolamine in organellar membranes2022

    • Author(s)
      Sakamaki Jun-ichi、Ode Koji L.、Kurikawa Yoshitaka、Ueda Hiroki R.、Yamamoto Hayashi、Mizushima Noboru
    • Journal Title

      Molecular Cell

      Volume: 82 Issue: 19 Pages: 3677-3692.e11

    • DOI

      10.1016/j.molcel.2022.08.008

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Conjugation of the ubiquitin family proteins to phospholipids2022

    • Author(s)
      Sakamaki Jun-Ichi、Mizushima Noboru
    • Journal Title

      Autophagy

      Volume: 19 Issue: 4 Pages: 1361-1362

    • DOI

      10.1080/15548627.2022.2123637

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Genome-wide CRISPR screening reveals nucleotide synthesis negatively regulates autophagy2021

    • Author(s)
      Mimura Kaito、Sakamaki Jun-Ichi、Morishita Hideaki、Kawazu Masahito、Mano Hiroyuki、Mizushima Noboru
    • Journal Title

      Journal of Biological Chemistry

      Volume: 296 Pages: 100780-100780

    • DOI

      10.1016/j.jbc.2021.100780

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Silencing the G-protein coupled receptor 3-salt inducible kinase 2 pathway promotes human β cell proliferation2021

    • Author(s)
      Iorio Caterina、Rourke Jillian L.、Wells Lisa、Sakamaki Jun-Ichi、Moon Emily、Hu Queenie、Kin Tatsuya、Screaton Robert A.
    • Journal Title

      Communications Biology

      Volume: 4 Issue: 1 Pages: 1-13

    • DOI

      10.1038/s42003-021-02433-2

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] BRD4-mediated repression of p53 is a target for combination therapy in AML2021

    • Author(s)
      Latif AL, Newcombe A, ... Sakamaki JI, ... Adams PD.
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1

    • DOI

      10.1038/s41467-020-20378-8

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition)12021

    • Author(s)
      Daniel J Klionsky、Shu Aizawa、Amal Kamal Abdel-Aziz、Sara Abdelfatah、Mahmoud Abdellatif、Asghar Abdoli、Steffen Abel、Hagai Abeliovich、Marie H Abildgaard、Yakubu Princely Abudu、Abraham Acevedo-Arozena、Iannis E Adamopoulos、Khosrow Adeli、Timon E Adolph、Annagrazia Adornetto、Elma Aflaki、Galila Agam et al.
    • Journal Title

      Autophagy

      Volume: 17 Issue: 1 Pages: 1-382

    • DOI

      10.1080/15548627.2020.1797280

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Ubiquitination of phosphatidylethanolamine in organellar membranes2022

    • Author(s)
      Jun-ichi Sakamaki, Koji L. Ode, Yoshitaka Kurikawa, Hiroki R. Ueda, Hayashi Yamamoto, Noboru Mizushima
    • Organizer
      The 23rd TMIMS International Symposium on "New Frontiers in Ubiquitin Proteasome System"
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Ubiquitination of phosphatidylethanolamine in organellar membranes2022

    • Author(s)
      Jun-ichi Sakamaki, Koji L. Ode, Yoshitaka Kurikawa, Hiroki R. Ueda, Hayashi Yamamoto, Noboru Mizushima
    • Organizer
      The international symposium in Tokyo 2022 "Ubiquitin New Frontier: from Neo-Biology to Targeted Protein Degradation"
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Ubiquitination of phosphatidylethanolamine in organellar membranes2022

    • Author(s)
      Jun-ichi Sakamaki, Koji L. Ode, Yoshitaka Kurikawa, Hiroki R. Ueda, Hayashi Yamamoto, Noboru Mizushima
    • Organizer
      第45回日本分子生物学会大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] オルガネラ膜脂質ホスファチジルエタノールアミンのユビキチン化2022

    • Author(s)
      坂巻純一、大出晃士、栗川義峻、上田泰己、山本林、水島昇
    • Organizer
      第95回日本生化学会大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Ubiquitination of phosphatidylethanolamine in organellar membranes2022

    • Author(s)
      Jun-ichi Sakamaki, Koji L. Ode, Yoshitaka Kurikawa, Hiroki R. Ueda, Hayashi Yamamoto, Noboru Mizushima
    • Organizer
      The 8th International Symposium on Autophagy
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] オルガネラ膜脂質ホスファチジルエタノールアミンのユビキチン化2022

    • Author(s)
      坂巻純一、大出晃士、栗川義峻、上田泰己、山本林、水島昇
    • Organizer
      第33回高遠分子細胞生物学シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] オルガネラ膜脂質ホスファチジルエタノールアミンのユビキチン化2022

    • Author(s)
      坂巻純一、大出晃士、栗川義峻、上田泰己、山本林、水島昇
    • Organizer
      第74回日本細胞生物学会大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Ubiquitination of phosphatidylethanolamine in organellar membranes2022

    • Author(s)
      坂巻純一、大出晃士、栗川義峻、上田泰己、山本林、水島昇
    • Organizer
      第21回東京大学生命科学シンポジウム
    • Related Report
      2022 Annual Research Report

URL: 

Published: 2020-04-28   Modified: 2024-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi