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- 伊藤 政博
- 東洋大学生命科学部生命科学科
書誌事項
- タイトル別名
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- Alkaliphilic Microorganisms : Lessons from Their Adaptations(Papers presented at the Seminar, "Biological mechanism of stress perception")
- 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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説明
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
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- 低温生物工学会誌
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低温生物工学会誌 57 (1), 25-32, 2011
低温生物工学会
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詳細情報 詳細情報について
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- CRID
- 1390282680063918592
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- NII論文ID
- 110008671117
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- NII書誌ID
- AN10448734
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- ISSN
- 24241555
- 13407902
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- NDL書誌ID
- 11094309
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可