1994
DOI: 10.1128/jb.176.23.7274-7279.1994
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Potassium extrusion by the moderately halophilic and alkaliphilic methanogen methanolobus taylorii GS-16 and homeostasis of cytosolic pH

Abstract: Methanolobus taylorii GS-16, a moderately halophilic and alkaliphilic methanogen, grows over a wide pH range, from 6.8 to 9.0. Cells suspended in medium with a pH above 8.2 reversed their transmembrane pH gradient (ApH), making their cytosol more acidic than the medium. The decreased energy in the proton motive force due to the reversed ApH was partly compensated by an increased electric membrane potential (A*

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Cited by 9 publications
(8 citation statements)
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“…Many other workers have described facultative alkaliphilic bacteria (Steele et al, 1992;Yasmin and Hasnain, 1993a, b, 1997) from saline habitats. Moderately halophilic and alkaliphilic methanogens which could grow over a wide pH range from 6.8-9 were also reported by Ni et al (1994). The strains described here were sensitive to Sm, Tc, Ap and Cm and were resistant to Km.…”
Section: Discussionsupporting
confidence: 73%
“…Many other workers have described facultative alkaliphilic bacteria (Steele et al, 1992;Yasmin and Hasnain, 1993a, b, 1997) from saline habitats. Moderately halophilic and alkaliphilic methanogens which could grow over a wide pH range from 6.8-9 were also reported by Ni et al (1994). The strains described here were sensitive to Sm, Tc, Ap and Cm and were resistant to Km.…”
Section: Discussionsupporting
confidence: 73%
“…ϩ antiporters have been implicated in pH regulation in other bacteria before (22,29). In addition, the intracellular formation of acids (e.g.…”
Section: Discussionmentioning
confidence: 99%
“…To counteract the H ϩ expulsion and to maintain an intracellular pH of around 8.2, these bacteria possess Na ϩ /H ϩ antiporters (9,23). K ϩ /H ϩ antiporters have also been implicated in the regulation of the intracellular pH (29) in such organisms as the moderately halophilic and alkaliphilic methanogen Methanolobus taylorii GS-16 (22). In this respect, K ϩ ions play a role in pH homeostasis in Bacillus alcalophilus (14) and in the ureolytic bacterium Bacillus pasteurii (10).…”
mentioning
confidence: 99%
“…The energy in the ⌬ H ϩ is the sum of the energies in the transmembrane pH gradient (⌬pH) and the transmembrane electrical gradient (⌬). Most of the energy in the ⌬ H ϩ of Methanolobus taylorii is accounted for by its large ⌬ (i.e., the outside of the cell is more positively charged); its ⌬pH is therefore small or even negative (31). Methanolobus taylorii is a slight alkaliphile, and its small or negative ⌬pH allows it to grow with a near-neutral cytosol even when the external pH is above 7.…”
mentioning
confidence: 99%