Sodium ATPase and Sodium/proton Antiporter Are Not Obligatory for Sodium Homeostasis of Enterococcus hirae at Acid pH
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概要
- 論文の詳細を見る
Enterococcus hirae grows in a broad pH range from 5 to 11. An E. hirae mutant 7683 lacking the activities of two sodium pumps, Na^+-ATPase and Na^+/H^+ antiporter, does not grow in high Na^+ medium at pH above 7.5. We found that 7683 grew normally in high Na^+ medium at pH 5.5. Although an energy-dependent sodium extrusion at pH 5.5 was missing, the intracellular levels of Na^+ and K^+ were normal in this mutant. The Na^+ influx rates of 7683 and two other strains at pH 5.5 were much slower than those at pH 7.5. These results suggest that Na^+ elimination of this bacterium at acid pH is achieved by a decrease in Na^+ entry and a normal K^+ uptake.
- 社団法人日本農芸化学会の論文
- 2000-05-23
著者
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Igarashi Kazuei
Faculty of Pharmaceutical Science,Chiba University
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Kakinuma Yoshimi
Faculty Of Agriculture Ehime University
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IKEGAMI Miho
Faculty of Pharmaceutical Sciences, Chiba University
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TAKAHASHI Hiroko
Faculty of Pharmaceutical Sciences, Chiba University
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Ikegami Miho
Faculty Of Pharmaceutical Sciences Chiba University
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Takahashi Hiroko
Faculty Of Pharmaceutical Sciences Chiba University
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TAKAHASHI Hiroko
Faculty of Agriculture and Life Sciences, Hirosaki University
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Kakinuma Yoshimi
Faculty Agri, Ehime Univ.
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