Effect of potassium and sodium ions on the cytoplasmic pH of an alkalophilic Bacillus

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公開日
1985-01
権利情報
  • https://www.elsevier.com/tdm/userlicense/1.0/
DOI
  • 10.1016/0005-2736(85)90540-1
公開者
Elsevier BV

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Abstract A bacterium belonging to Bacillus and tentatively designated as a facultatively alkalophilic Bacillus grows optimally at pH 7.5–10.2 (Koyama, N., Takinishi, H. and Nosoh, Y. (1983) FEMS Microbiol. Lett. 16 213–216). The internal pH of the bacterium was higher than the external pH in the pH range below 8, in the presence of KCl, but in the pH range above 9 the internal pH was lower than the external pH, both in the absence and presence of KCl. The internal pH of the bacterium in the presence of KCl was thus kept at 8.2–9.2 in the external pH range from 7.5 to 10.0. At pH 7.5, an extrusion of H+ in specific exchange for K+ was observed. The membrane vesicles, when energized with ascorbate plus tetramethylphenylenediamine, exhibited the formation of a transmembrane pH gradient (acid, interior), the magnitude of which became greater on increasing the extravesicular pH above 8 in the presence of NaCl. The alkalinization and acidification of the cytoplasm by the specific exchange of H+ for K+ and Na+, respectively, were suggested for a pH homeostasis of this bacterium.

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