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A study on a low-cost translation mechanism in the mitochondrial ribosome of the malaria parasite

Research Project

Project/Area Number 20K07461
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 49040:Parasitology-related
Research InstitutionChiba University

Principal Investigator

Hikosaka Kenji  千葉大学, 大学院医学研究院, 准教授 (30456933)

Co-Investigator(Kenkyū-buntansha) 渡邊 洋一  東京大学, 大学院医学系研究科(医学部), 准教授 (90323568)
稲岡 健ダニエル  長崎大学, 熱帯医学研究所, 准教授 (10623803)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsマラリア原虫 / ミトコンドリア / リボソーム / 翻訳機構 / TAP法 / ミトコンドリアリボソーム / リボソームタンパク質 / アフィニティ精製 / 翻訳
Outline of Research at the Start

マラリア原虫のmtDNAには3つのタンパク質遺伝子のみがコードされており、わずか3つの遺伝子を翻訳するために、約40個のmtリボソームタンパク質が細胞質で合成されミトコンドリアに輸送されることになる。このことは極めて非効率的であるように思えるが、そこには特殊な翻訳「装置」が存在することが示唆される。
本研究では、マラリア原虫を含むアピコンプレクサ類から渦鞭毛藻類などの原生生物まで生物群を超えて広く保存されているmtリボソームの翻訳の特殊な仕組みを明らかにすることで、最小限の翻訳機構を備えるリボソームを構成する重要なタンパク質を特定し、生命活動の根幹に迫る。

Outline of Final Research Achievements

The number of mitochondrial (mt) ribosomal proteins in the malaria parasite is extremely small. It is thus seemed that the structure of its mt ribosomes highly differs from that of mammals such as humans. Consequently, we conceived clarifying the three-dimensional structure of this mt ribosomes by isolating them by the Tandem Affinity Purification (TAP) system. Currently, we generated two strains of recombinant parasites with TAP-tagged mt ribosomal proteins (PfmL13 and PfmS17) and confirmed that these protein genes expressed expressed at RNA and protein levels by RT-PCR and western blotting, respectively. Additionally, both ribosomal proteins were localized in parasite mitochondria by fluorescent staining. Furthermore, we performed immunoprecipitation using magnetic beads and found that the parasite mt ribosomal proteins would be separated.

Academic Significance and Societal Importance of the Research Achievements

一般的に、ミトコンドリアは密度勾配遠心法によって単離されるが、マラリア原虫の場合、アピコプラストと呼ばれる色素体がミトコンドリアと接着しているため単離が困難である。これは、色素体をもった他の原生生物でも同じ状況であることが予想される。本研究によって、ミトコンドリア単離のステップの必要がないTandem Affinity purification法によりミトコンドリア(mt)リボソームを単離する道筋を示せたことで、これまで困難であった他の原生生物種におけるmtリボソームの解析が進み、生命活動の根源に関わるリボソームの構造進化の領域において大きなインパクトを持つものと考えられる。

Report

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

    (11 results)

All 2022 2021 Other

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

  • [Journal Article] Erdheim-Chester Disease Involving the Central Nervous System with Latent Toxoplasmosis2022

    • Author(s)
      Wadayama Tomoya、Shimizu Mikito、Kimura Ikko、Baba Kousuke、Beck Goichi、Nagano Seiichi、Morita Ryo、Nakagawa Hidenori、Shirano Michinori、Goto Tetsushi、Norose Kazumi、Hikosaka Kenji、Murayama Shigeo、Mochizuki Hideki
    • Journal Title

      Internal Medicine

      Volume: 61 Issue: 17 Pages: 2661-2666

    • DOI

      10.2169/internalmedicine.8564-21

    • NAID

      130008158352

    • ISSN
      0918-2918, 1349-7235
    • Year and Date
      2022-09-01
    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Development of a novel electroporation method for the oyster parasite Perkinsus marinus.2022

    • Author(s)
      Sakamoto H, Lin XX, Bai YD, Chen XF, Zhang ZZ, Honjo Y, Hikosaka K.
    • Journal Title

      Sci Rep

      Volume: 12 Issue: 1 Pages: 19996-19996

    • DOI

      10.1038/s41598-022-24548-0

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] New PCR primers targeting the cytochrome b gene reveal diversity of Leucocytozoon lineages in an individual host.2022

    • Author(s)
      Honjo Y, Fukumoto S, Sakamoto H, Hikosaka K.
    • Journal Title

      Parasitol Res.

      Volume: 121 Issue: 11 Pages: 3313-3320

    • DOI

      10.1007/s00436-022-07667-5

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Siccanin is a dual-target inhibitor of Plasmodium falciparum mitochondrial complex II and complex III.2022

    • Author(s)
      Komatsuya K, Sakura T, Shiomi K, Omura S, Hikosaka K, Nozaki T, Kita K, Inaoka DK.
    • Journal Title

      Pharmaceuticals

      Volume: 15 Issue: 7 Pages: 903-903

    • DOI

      10.3390/ph15070903

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Clinical characteristics and incidence of toxoplasmosis after autologous hematopoietic stem cell transplantation: A retrospective study and literature review2021

    • Author(s)
      Kitahara Mari、Hiroshima Yuki、Norose Kazumi、Hikosaka Kenji、Kazumoto Hiroko、Uematsu Nozomu、Shishido Tsutomu、Kaiume Hiroko、Sato Keijiro、Ueki Toshimitsu、Sumi Masahiko、Watanabe Masahide、Kobayashi Hikaru
    • Journal Title

      Transplant Infectious Disease

      Volume: 23 Issue: 6

    • DOI

      10.1111/tid.13726

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Acute exacerbation of pulmonary toxoplasmosis during corticosteroid therapy for immune thrombocytopenia2021

    • Author(s)
      Omori Koji、Imoto Naoto、Norose Kazumi、Maeda Matsuyoshi、Hikosaka Kenji、Kurahashi Shingo
    • Journal Title

      Medicine

      Volume: 100 Issue: 51 Pages: e28430-e28430

    • DOI

      10.1097/md.0000000000028430

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Development of a rapid scabies immunodiagnostic assay based on transcriptomic analysis of Sarcoptes scabiei var. nyctereutis2021

    • Author(s)
      Akuta T, Minegishi D. Kido N, Imaizumi K, Nakaoka S, Tachibana S, Hikosaka K, Hori F, Masataka N, Sakuma C, Oouchi Y, Nakajima Yu, Tanaka S, Omiya T, Morikaku K, Kawahara M, Tada Y, Tarui H, Ueda T, Kikuchi-Ueda T, Ono Y.
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 6455-6455

    • DOI

      10.1038/s41598-021-85290-7

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Hypericum perforatum extract and hyperforin inhibit the growth of neurotropic parasite Toxoplasma gondii and infection-induced inflammatory responses of glial cells in vitro2021

    • Author(s)
      Shinjyo Noriko、Nakayama Hideyuki、Li Li、Ishimaru Kanji、Hikosaka Kenji、Suzuki Noriyuki、Yoshida Hiroki、Norose Kazumi
    • Journal Title

      Journal of Ethnopharmacology

      Volume: 267 Pages: 113525-113525

    • DOI

      10.1016/j.jep.2020.113525

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Challenges in isolation of mitochondrial ribosomes from the malaria parasite2022

    • Author(s)
      Xioxia Lin, Hirokazu Sakamoto, Rie Kubota, Yoh-Ichi Watanabe, Daniel Ken Inaoka, Naoaki Shinzawa, Kenji Hikosaka
    • Organizer
      第92回日本寄生虫学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 酵母細胞質型ジヒドロオロト酸脱水素酵素遺伝子を導入したげっ歯類マラリア原虫のアトバコン耐性発現パターンの解析2022

    • Author(s)
      陳雪、新倉保、坂本寛和、佐倉孝哉、稲岡ダニエル健、彦坂健児
    • Organizer
      第92回日本寄生虫学会
    • Related Report
      2022 Annual Research Report
  • [Remarks] 千葉大学大学院医学研究院感染生体防御学ホームページ

    • URL

      https://www.m.chiba-u.jp/dept/infection-hostdefense/

    • Related Report
      2022 Annual Research Report

URL: 

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

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