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Development of artificially differentiated cells using multicellular cyanobacterium towards anaerobic photosynthetic bioproduction

Research Project

Project/Area Number 18K05395
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 38020:Applied microbiology-related
Research InstitutionResearch Institute of Innovative Technology for the Earth

Principal Investigator

Higo Akiyoshi  公益財団法人地球環境産業技術研究機構, その他部局等, 研究員 (20790249)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords合成生物学 / シアノバクテリア / 代謝改変 / 物質生産
Outline of Final Research Achievements

Anabaena sp. PCC 7120 is a filamentous multicellular cyanobacterium composed of vegetative cells and heterocysts, specialized cells for nitrogen fixation. While cyanobacteria have attracted much attention as hosts of photosynthetic bioproduction in recent years, oxygen-evolving photosynthesis conflicts with anaerobic fermentation. In the present study, heterocysts, in which microoxic conditions are maintained to protect nitrogenase from oxygen, are repurposed as a bioproduction factory by development of heterocyst-specific conditional gene knockdown system. The spatio-temporal gene regulation system realized artificial metabolic division of labor, which resulted in enhanced bioethanol production.

Academic Significance and Societal Importance of the Research Achievements

太陽光を利用できるシアノバクテリアによる有用物質の生産は、低炭素社会の実現に向け、重要な課題の一つである。単細胞性のシアノバクテリアを利用する研究が多いが、酸素を発生する光合成と発酵生産はうまくかみ合わず、生産のボトルネックになっていることが多かった。本課題では2種類の細胞からなる多細胞性シアノバクテリアの特徴を最大限活かした物質生産系を構築した。細胞腫特異的な遺伝子発現ノックダウンが可能であるシステムを新たに開発し、光合成と物質生産の分業システムを人工的にデザイン・構築し、効率的な微生物によるモノづくりを実現した。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (5 results)

All 2021 2020 2019

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (2 results)

  • [Journal Article] cyAbrB Transcriptional Regulators as Safety Devices To Inhibit Heterocyst Differentiation in Anabaena sp. Strain PCC 71202019

    • Author(s)
      Higo Akiyoshi、Nishiyama Eri、Nakamura Kota、Hihara Yukako、Ehira Shigeki
    • Journal Title

      Journal of Bacteriology

      Volume: 201 Issue: 17

    • DOI

      10.1128/jb.00244-19

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Anaerobic butanol production driven by oxygen-evolving photosynthesis using the heterocyst-forming multicellular cyanobacterium Anabaena sp. PCC 71202019

    • Author(s)
      Higo Akiyoshi、Ehira Shigeki
    • Journal Title

      Applied Microbiology and Biotechnology

      Volume: 103 Issue: 5 Pages: 2441-2447

    • DOI

      10.1007/s00253-019-09635-z

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Spatiotemporal Gene Repression System in the Heterocyst-Forming Multicellular Cyanobacterium Anabaena sp. PCC 71202019

    • Author(s)
      Higo Akiyoshi、Ehira Shigeki
    • Journal Title

      ACS Synthetic Biology

      Volume: 8 Issue: 4 Pages: 641-646

    • DOI

      10.1021/acssynbio.8b00496

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] CRISPRi を用いたシアノバクテリアSynechocystis sp. PCC 6803 のcyAbrB1 転写因子の機能解析2021

    • Author(s)
      菱田温子,肥後明佳,松谷峰之介,荷村(松根)かおり,渡辺智,得平茂樹,日原由香子
    • Organizer
      第62回日本植物生理学会年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 酸素発生型光合成で駆動する嫌気発酵プロセス2020

    • Author(s)
      得平 茂樹、肥後 明佳
    • Organizer
      日本農芸化学会2020年度大会
    • Related Report
      2019 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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