微生物に学ぶアルカリ性環境適応戦略 Alkaliphilic Microorganisms : Lessons from Their Adaptations

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著者

    • 伊藤 政博 ITO Masahiro
    • 東洋大学生命科学部生命科学科 Faculty of Life Sciences, and Bio-Nano Electronics Research Center, Toyo University

抄録

Alkaliphiles, which are capable of growth in an extremely alkaline environment, serve as a model system to understand the physiological mechanisms allowing microbial growth under extreme environmental conditions. The internal pH of alkaliphiles is kept 2 units lower than the external pH 10 or higher. In alkaliphilic Bacillus, Na^+-dependent pH homeostasis involves the Na^+/H^+ antiport activities as well as Na^+ re-entry routes. A predominant role was evident for the NaChBac (voltage-dependent) Na channel of alkaliphilic B. pseudofirmus OF4 at sub-optimal [Na^+]. NaChBac mutants exhibit a significant loss of pH homeostasis capacity. Alkaliphilic Bacillus halodurans C-125 produces negatively charged acidic polymers that are associated with the peptidoglycan as secondary cell-wall polymers. Mutant strains which introduced mutations in genes encoding acidic polymers biosynthesis result in a growth defect according by elevated cytoplasmic pH. Alkaliphilic Bacillus clausii KSM-K16 was recently identified as the first bacterium in which a single stator-rotor of bacterial flagellar motor uses both protons and sodium ions for ion-coupling, depending upon the environmental pH.

収録刊行物

  • 低温生物工学会誌 = Cryobiology and cryotechnology

    低温生物工学会誌 = Cryobiology and cryotechnology 57(1), 25-32, 2011-04-15

    低温生物工学会

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各種コード

  • NII論文ID(NAID)
    110008671117
  • NII書誌ID(NCID)
    AN10448734
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13407902
  • NDL 記事登録ID
    11094309
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業) // ZR2(科学技術--生物学--生化学)
  • NDL 請求記号
    Z17-945
  • データ提供元
    CJP書誌  NDL  NII-ELS 
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