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Structural and biological study of electrode reduction by Geobacteraceae

Research Project

Project/Area Number 19K05771
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 InstitutionUniversity of Miyazaki

Principal Investigator

Inoue Kengo  宮崎大学, 農学部, 准教授 (70581304)

Co-Investigator(Kenkyū-buntansha) 和田 啓  宮崎大学, 医学部, 准教授 (80379304)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
KeywordsGeobacter / 細胞外電子伝達 / シトクロム / シトクロムc / 生物電気化学 / 微生物燃料電池 / X線結晶構造解析
Outline of Research at the Start

電極へ直接電子を伝達できる微生物、Geobacter sulfurreducensにおいて細胞外に局在するc型シトクロムは電極への電子伝達に必須である。omcZは細胞外シトクロムのうち遺伝子破壊によって電極への電子伝達能力が著しく低下する遺伝子の一つである。また、鉄還元菌であるG. sulfurreducensが持つomcB、omcSはいずれもその破壊株は酸化鉄(III)の還元能力を失う。本研究では、これら3つの細胞外局在c型シトクロムのX線結晶構造解析を行い、c型シトクロム-電極間、c型シトクロム-鉄間の相互作用や電子伝達様式について、分子・原子レベルで明らかにする。

Outline of Final Research Achievements

Geobacter sulfurreducens has an extremely high extracellular electron transfer capacity. To elucidate the structure of outer membrane cytochrome OmcZ, which is essential for optimal extracellular electron transfer to the electrode, over expression system of OmcZ in G. sulfurreducens was established and OmcZ was purified. After screening crystallization conditions using the purified OmcZ, crystals were successfully obtained and X-ray diffraction data were collected. The highest resolution data of 2.2 A was successfully obtained. Furthermore, using four types of heavy atoms, Pt, Hg, Au, and Pb, the crystals were soaked into a cryo-solution containing these atoms, and heavy-atom substituted crystals were prepared. Data for phase determination was collected from the obtained crystals.

Academic Significance and Societal Importance of the Research Achievements

Geobacter sulfurreducensがもつ細胞外電子伝達能力には電気伝導性ナノワイヤーが重要であることが知られている。これまでにPilA、OmcS、およびOmcZを構成するナノワイヤーが報告されており、これらのうち、OmcZのみその立体構造が明らかになっていない。本研究では、OmcZの立体構造決定を試み、構造解明に十分な分解能の反射データを得ることに成功した。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (2 results)

All 2021

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results) Presentation (1 results)

  • [Journal Article] Proteolytic Maturation of the Outer Membrane c-Type Cytochrome OmcZ by a Subtilisin-Like Serine Protease Is Essential for Optimal Current Production by Geobacter sulfurreducens2021

    • Author(s)
      Ayako kai, Takahiro Tokuishi, Takashi Fujikawa, Yoshihiro Kawano, Toshiyuki Ueki, Miyuki Nagamine, Yoichi Sakakibara, Masahito Suiko, Kengo Inoue
    • Journal Title

      Applied and Environmental Microbiology

      Volume: 87 Issue: 12

    • DOI

      10.1128/aem.02617-20

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 細菌の細胞外への電子伝達に関する研究2021

    • Author(s)
      井上謙吾
    • Organizer
      第19回微生物研究会
    • Related Report
      2021 Annual Research Report

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Published: 2019-04-18   Modified: 2023-01-30  

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