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Search for factors enabling intracellular symbiosis using a chlorella mutant that have lost symbiotic ability

Research Project

Project/Area Number 20K06640
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 InstitutionKobe University

Principal Investigator

Suzaki Toshinobu  神戸大学, 理学研究科, 理学研究科研究員 (00187692)

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: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords細胞内共生 / クロレラ / ミドリゾウリムシ / 細胞間相互作用 / シンビオソーム
Outline of Research at the Start

本研究課題における学術的「問い」は、細胞内共生を可能とする分子的仕組みは何か?という問題である。これまでの研究から、共生藻を失った変異株の表層から、p120タンパク質が欠失していることがわかっている。褐虫藻と刺胞動物との共生系や、マラリア原虫などの病原性微生物と哺乳動物細胞との感染系などにおいても、共生能を失った変異体の作出が試みられている。従って、将来本研究の成果との比較が可能となれば、細胞内共生系の基本原理が解明されることが期待できる。このことは、ミトコンドリアや葉緑体を獲得して進化してきた真核生物の成立機構を説明することにも繋がる可能性がある。

Outline of Final Research Achievements

In this study, a mutant strain (NC64A-#48) was created from Chlorella variabilis NC64A that lacks symbiotic ability with the host paramecium. The mutant also lacked p120 protein, which is normally found on the cell wall surface layer. Comparison of the genomic sequence of the gene encoding p120 showed no variation in the genomic sequence of the mutant strain. However, the mRNA sequence showed splicing aberrations for some reason, suggesting that this may be the cause of the aberrant expression of p120. In addition to Paramecium, strain NC64A is known to be symbiotic with amoebae and stentors, as well as multicellular green hydras. The NC64A-#48 strain was found to be unable to re-symbiose with these organisms, suggesting that the function of p120 is common across host species.

Academic Significance and Societal Importance of the Research Achievements

ミドリゾウリムシとクロレラとの共生関係については、これまでにミドリゾウリムシの側から調べた研究が多く報告されているが、共生成立の分子機構に関する手掛かりは何も得られていなかった。そこで本研究では、研究の視点を変えて、クロレラ側からのアプローチによって、細胞内共生の分子機構を解明しようと試みた。その結果、クロレラが細胞壁上に提示しているp120タンパク質が共生包膜とクロレラとの細胞間接着を介した細胞内共生の成立と維持に不可欠であることがわかった。今回の研究結果は、さまざまな共生系に共通する分子機構の解明に繋がる可能性を示すものとして意義がある。

Report

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

    (15 results)

All 2023 2022 2021 2020

All Journal Article (7 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 7 results,  Open Access: 4 results) Presentation (8 results) (of which Int'l Joint Research: 5 results)

  • [Journal Article] The unicellular green alga Chlorogonium capillatum as a live food promotes the growth and survival of Artemia larvae2023

    • Author(s)
      Nishida Yuki、Hoshina Ryo、Higuchi Shinnosuke、Suzaki Toshinobu
    • Journal Title

      Aquaculture

      Volume: 566 Pages: 739227-739227

    • DOI

      10.1016/j.aquaculture.2022.739227

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] An Enigmatic Stramenopile Sheds Light on Early Evolution in Ochrophyta Plastid Organellogenesis2022

    • Author(s)
      Tomonori Azuma, Tomas Panek, Alexander K. Tice, Motoki Kayama, Mayumi Kobayashi, Hideaki Miyashita, Toshinobu Suzaki, Akinori Yabuki, Matthew W. Brown, Ryoma Kamikawa
    • Journal Title

      Molecular Biology and Evolution

      Volume: 39 Issue: 4 Pages: 1-12

    • DOI

      10.1093/molbev/msac065

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Ectopic accumulation of ceramide in cardiomyocytes modulates alcoholic cardiomyopathy via the TLR4‐dependent pathway2022

    • Author(s)
      Wang Cui、Li Songtao、Liu Qingsheng、Qian Qianyu、Fu Ai、Chen Lin、Zhang Lei、Suzaki Toshinobu、Yu ZhiLing、Dou Xiaobing
    • Journal Title

      Alcoholism: Clinical and Experimental Research

      Volume: 46 Issue: 6 Pages: 1011-1022

    • DOI

      10.1111/acer.14822

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] SEM observation of non-fixed and water freeze-dried Spirostomum ambiguum2022

    • Author(s)
      H. Ishida, C, Matsumoto, M. Shimada, T. Suzaki
    • Journal Title

      Europian Journal of Protistology

      Volume: 85 Pages: 1-7

    • DOI

      10.1016/j.ejop.2022.125896

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Interaction between centrohelid and actinophryid heliozoans: Field and laboratory studies2021

    • Author(s)
      Liudmyla Gaponova, Toshinobu Suzaki, MD Shafiqul Islam and Andrii Kolosuik
    • Journal Title

      Journal of Protistology

      Volume: 53 Issue: 0 Pages: n/a

    • DOI

      10.18980/jop.e004

    • NAID

      130008132201

    • ISSN
      2433-412X
    • Year and Date
      2021-12-23
    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Characterization of a green Stentor with symbiotic algae growing in an extremely oligotrophic environment and storing large amounts of starch granules in its cytoplasm2021

    • Author(s)
      Ryo Hoshina, Yuuji Tsukii, Terue Harumoto, Toshinobu Suzaki
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 2865-2865

    • DOI

      10.1038/s41598-021-82416-9

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The effects of phospholipids and fatty acids on the oligomer formation of NAP-222020

    • Author(s)
      Odagaki Sin-Ichi、Maekawa Shohei、Hayashi Fumio、Suzaki Toshinobu、Morigaki Kenichi
    • Journal Title

      Neuroscience Letters

      Volume: 736 Pages: 135288-135288

    • DOI

      10.1016/j.neulet.2020.135288

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Morphological changes in Paramecium bursaria associated with algal endosymbiosis2021

    • Author(s)
      Masashi M. Hayakawa and Toshinobu Suzaki
    • Organizer
      4th Asian Congress of Protistology
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Actinophryids-centrohelids interactions and their behavior in field and laboratory experiments2021

    • Author(s)
      Liudmyla Gaponova, Toshinobu Suzaki, MD Shafiqul Islam and Andrii Kolosiuk
    • Organizer
      4th Asian Congress of Protistology
    • Related Report
      2021 Research-status Report
  • [Presentation] Protists as live food to feed brine shrimp larvae2021

    • Author(s)
      Yuki Nishida, Ryo Hoshina and Toshinobu Suzaki
    • Organizer
      4th Asian Congress of Protistology
    • Related Report
      2021 Research-status Report
  • [Presentation] Ultrastructure and function of the kinetocyst in the centrohelid heliozoon Raphidiophrys contractilis2020

    • Author(s)
      Yumeng Wan and Toshinobu Suzaki
    • Organizer
      Joint Meeting of the Japan Society of Protistology and Korean Society of Protistologists
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Involvement of mitochondria in Chlorella-Paramecium bursaria endosymbiosis2020

    • Author(s)
      Xin Yang and Toshinobu Suzaki
    • Organizer
      Joint Meeting of the Japan Society of Protistology and Korean Society of Protistologists
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Semi-permeability assay of Cryptosporidium oocyst wall using saturated sodium chloride solution2020

    • Author(s)
      Motomu Inoue, Shinji Izumiyama and Toshinobu Suzaki
    • Organizer
      Joint Meeting of the Japan Society of Protistology and Korean Society of Protistologists
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Interaction between centrohelid and actinophryid heliozoans in co-culture2020

    • Author(s)
      Liudmyla Gaponova, Toshinobu Suzaki and Andrii Kolosuik
    • Organizer
      Joint Meeting of the Japan Society of Protistology and Korean Society of Protistologists
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 過酷な貧栄養環境で生き残るための新しい「半植物」戦略としての繊毛虫における藻類共生2020

    • Author(s)
      洲崎敏伸,保科 亮,春本晃江
    • Organizer
      第4回日本共生生物学会大会
    • Related Report
      2020 Research-status Report

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

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