Bacterial Salmonella enteritidis var. Issatchenko in media without exogenic energy source uptakes K+ in one step with Km 2.1 mM and Vmax 0.08 mM min-1/10(12) cells. This K+ uptake does not depend on pH and osmotic shock and is not inhibited by DCC. Endogenic energy source (glucose) leads to K+ uptake with Km 2.8 mM and Vmax 0.10 mM min-1/10(12) cells, and secretion of H+. The ratio of the DCC-sensitive fluxes of H+ to K+ equals 2. Arsenate and protonophores depress the K+ uptake. Valinomycin decreases the rate of K+ uptake. It is assumed that K+ uptake takes place via the Trk-like system, which works as a separate system as supercomplex with the H+-ATPase complex.
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