Alkaliphilic Microorganisms : Lessons from Their Adaptations(Papers presented at the Seminar, "Biological mechanism of stress perception")
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- ITO Masahiro
- Faculty of Life Sciences, and Bio-Nano Electronics Research Center, Toyo University
Bibliographic Information
- Other Title
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- 微生物に学ぶアルカリ性環境適応戦略(セミナー「生物のストレス受容のメカニズム-分子レベルから細胞レベルまで-」)
- 微生物に学ぶアルカリ性環境適応戦略
- ビセイブツ ニ マナブ アルカリセイ カンキョウ テキオウ センリャク
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Description
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.
Journal
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- Cryobiology and Cryotechnology
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Cryobiology and Cryotechnology 57 (1), 25-32, 2011
Japanese Society of Cryobiology and Cryotechnology
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Details 詳細情報について
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- CRID
- 1390282680063918592
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- NII Article ID
- 110008671117
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- NII Book ID
- AN10448734
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- ISSN
- 24241555
- 13407902
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- NDL BIB ID
- 11094309
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed