[Transport of protons and potassium ions across the membranes of bacteria Enterococcus hirae depends on ATP and nicotineamide adenine dinucleotides].

The transport of protons and potassium ions across the membranes of the bacteria Enterococcus hirae growing in an alkaline medium (pH 8.0) or under experimental conditions (pH 7.5) during glucose fermentation accomplished by a KtrI-system of absorption of potassium ions, which can interact with F0F1-ATPase to form at H(+)-K(+)-pump, has been studied. It was found on cells with a high membrane permeability that the administration of nicotinamideadenine dinucleotides results in the potassium absorption, which is insensitive to the inhibitor of F0F1-ATPase N,N'-dicyclohexylcarbodiimide. It is assumed that, along with the KtrI system, which interacts with F0F1-ATPase, a separate or another K+ absorption system operates in these bacteria under particular conditions, which is dependent on NAD(+)+NADH. Presumably, these interact with this system, changing its conformational state required for the transition to the "active" form.