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Identification of the physiological role of inositol kinase and inositol monophosphate in Archaea

Research Project

Project/Area Number 26850049
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Applied microbiology
Research InstitutionKyoto University

Principal Investigator

Sato Takaaki  京都大学, 工学研究科, 助教 (60571411)

Project Period (FY) 2014-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
KeywordsInositol / Kinase / Archaea / Hyperthermophile / イノシトール / キナーゼ / アーキア / 高温ストレス適応 / 適合溶質 / 高温ストレス応答 / inositol / イノシトールキナーゼ / 代謝 / 遺伝子破壊 / 反応産物同定 / 発現活性化条件同定 / 微生物
Outline of Final Research Achievements

The purpose of this study is to identify the physiological role of myo-inositol kinase and its product, myo-inositol phosphate, in Archaea. The reaction product of the archaeal inositol kinase was identified to be inositol 3-phosphate whose hydroxyl group at C3 position is phosphorylated among six hydroxyl groups. Inositol 3-phosphate is generally synthesized from glucose 6-phosphate, which can be the substrate to synthesize a compatible solute. In addition, in vivo analyses of its gene transcription levels and gene disruption strain suggested that this enzyme is involved in the response to environmental stress. These results obtained in this study suggested that the myo-inositol kinase phosphorylates an inositol, generated with some kind of metabolism, to synthesize compatible solutes.

Academic Significance and Societal Importance of the Research Achievements

原核生物においてはイノシトールという糖アルコールは環境変化に対応するための適合溶質の原料となったり、真核生物においてはシグナル伝達物質となったりする。原核生物であるアーキアにおいてイノシトールをリン酸化する酵素が見つかったが、一般的には適合溶質の生合成にリン酸化のステップはないことから、その生理的役割は不明であった。本研究では、酵素の解析や遺伝子破壊株を使った実験により、イノシトールをリン酸化する酵素の役割がやはり環境ストレスへの適応であることを示唆する知見を得た。適合溶質の生合成もしくは再生に関して今までは知られていなかった経路が存在することが示唆され、新たな研究への展開が期待される。

Report

(4 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Research-status Report
  • 2014 Research-status Report
  • Research Products

    (8 results)

All 2016 2015 2014

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results,  Acknowledgement Compliant: 1 results) Presentation (6 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] An archaeal ADP-dependent serine kinase involved in cysteine biosynthesis and serine metabolism2016

    • Author(s)
      Yuki Makino, Takaaki Sato, Hiroki Kawamura, Shin-ichi Hachisuka, Ryo Takeno, Tadayuki Imanaka, and Haruyuki Atomi
    • Journal Title

      Nature Communications

      Volume: 7 Issue: 1 Pages: 13446-13446

    • DOI

      10.1038/ncomms13446

    • NAID

      120006318855

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Crystal structure and product analysis of an archaeal myo-inositol kinase reveal substrate recognition mode and 3-OH phosphorylation2015

    • Author(s)
      Ryuhei Nagata, Masahiro Fujihashi, Takaaki Sato, Haruyuki Atomi and Kunio Miki
    • Journal Title

      Biochemistry

      Volume: 54 Issue: 22 Pages: 3494-3503

    • DOI

      10.1021/acs.biochem.5b00296

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Functional characterization of three ribokinase family proteins in the hyperthermophilic archaeon Thermococcus kodakarensis2016

    • Author(s)
      Takaaki Sato, Riku Aono, Masahiro Fujihashi, Yukika Miyamoto, Keiko Kuwata, Eriko Kusaka, Haruo Fujita, Kunio Miki, Tadayuki Imanaka, and Haruyuki Atomi
    • Organizer
      The 14th China-Japan-Korea Joint Symposium on Enzyme Engineering
    • Place of Presentation
      Guangxi Wharton International Hotel, Nanning, China
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 超好熱性アーキアにおけるmyo-inositol kinaseの同定と解析2016

    • Author(s)
      佐藤 喬章、藤橋 雅宏、永田 隆平、宮本 幸花、桑田 啓子、日下 絵里子、藤田 春雄、三木 邦夫、跡見 晴幸
    • Organizer
      第17回極限環境生物学会年会
    • Place of Presentation
      東京工業大学すずかけ台キャンパス
    • Related Report
      2016 Annual Research Report
  • [Presentation] 超好熱性アーキアにおける新規ペントース代謝経路の同定2015

    • Author(s)
      佐藤喬章
    • Organizer
      第16回極限環境生物学会
    • Place of Presentation
      東京海洋大学 品川キャンパス
    • Year and Date
      2015-11-09
    • Related Report
      2015 Research-status Report
  • [Presentation] 超好熱性アーキアThermococcus kodakarensisにおけるribokinase family タンパク質の機能解明2014

    • Author(s)
      佐藤喬章, 青野陸, 藤橋雅宏, 宮本幸花, 桑田啓子, 日下絵里子, 藤田春雄, 三木邦夫, 今中忠行, 跡見晴幸
    • Organizer
      日本生物工学会
    • Place of Presentation
      札幌、日本
    • Year and Date
      2014-09-10
    • Related Report
      2014 Research-status Report
  • [Presentation] Novel metabolic pathways in Archaea2014

    • Author(s)
      Takaaki Sato, Riku Aono, Sanae Hodo, Yuta Yoshii, Tadayuki Imanaka, and Haruyuki Atomi
    • Organizer
      2014 Korean Society for Microbiology and Biotechnology International Symposium & Annual Meeting
    • Place of Presentation
      Busan, Korea
    • Year and Date
      2014-06-26
    • Related Report
      2014 Research-status Report
    • Invited
  • [Presentation] Functional characterization of three ribokinase family proteins in the hyperthermophilic archaeon Thermococcus kodakarensis2014

    • Author(s)
      Takaaki Sato, Riku Aono, Masahiro Fujihashi, Yukika Miyamoto, Keiko Kuwata, Eriko Kusaka, Haruo Fujita, Kunio Miki, Tadayuki Imanaka, and Haruyuki Atomi
    • Organizer
      American Society for Microbiology 114th General Meeting
    • Place of Presentation
      Boston, USA
    • Year and Date
      2014-05-18
    • Related Report
      2014 Research-status Report

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Published: 2014-04-04   Modified: 2023-03-23  

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