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In the E1 state of the Na,K-ATPase all cations present in the cytoplasm compete for the ion binding sites. The mutual effects of mono-, di- and trivalent cations were investigated by experiments with the electrochromic fluorescent dye RH421. Three sites with significantly different properties could be identified. The most unspecific binding site is able to(More)
To investigate Na+ binding to the ion-binding sites presented on the cytoplasmic side of the Na,K-ATPase, equilibrium Na+-titration experiments were performed using two fluorescent dyes, RH421 and FITC, to detect protein-specific actions. Fluorescence changes upon addition of Na+ in the presence of various Mg2+ concentrations were similar and could be(More)
Based on the following observations we propose that the cytoplasmic loop between trans-membrane segments M6 and M7 (L6/7) of the ␣ subunit of Na ؉ ,K ؉-ATPase acts as an entrance port for Na ؉ and K ؉ ions. 1) In defined conditions chymotrypsin specifically cleaves L6/7 in the M5/M6 fragment of 19-kDa membranes, produced by extensive proteolysis of Na ؉ ,K(More)
Eubacterium acidaminophilum combines the oxidation of amino acids such as alanine or valine with the reduction of glycine to acetate in a two-substrate fermentation (Stickland reaction). In the absence of glycine, dense cell suspensions oxidized alanine or valine only to a small extent, with limited production of hydrogen and acetate. Experiments with 14(More)
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