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Alkalophilic Bacillus sp. strain C-59 could grow well on an alkaline medium containing K2CO3, as well as Na2CO3, but did not grow on K+-depleted medium. Right-side-out membrane vesicles, energized in the absence of Na+, however, could not take up [14C]methylamine actively, while vesicles equilibrated with 10 mM NaCl actively took up [14C]methylamine. The uptake of [14C]serine was also stimulated by the addition of Na+, and the imposition of a sodium gradient caused transient uptake. These results indicated that an Na+/H+ antiporter was involved in pH homeostasis and generation of an electrochemical sodium gradient in strain C-59 even though a growth requirement for Na+ was not evident. The efflux of 22Na+ from 22Na+-loaded vesicles was more rapid at pH 9.5 than at pH 7 in the presence of an electron donor. On the other hand, vesicles at pH 7 showed more rapid efflux than at pH 9.5 when the antiporter was energized by a valinomycin-mediated K+ diffusion potential (inside negative).

Bioenergetic properties of alkalophilic Bacillus sp. strain C-59 on an alkaline medium containing K2CO3