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Involvement of various amino- and carboxyl-terminal residues in the active site of the histidine-containing protein HPr of the phosphoenolpyruvate-dependent phosphotransferase system of Staphylococcus carnosus: site-directed mutagenesis with the ptsH gene, biochemical characterization and NMR studies of the mutant proteins.

Kruse, R. ; Hengstenberg, W. ; Beneicke, W. ; Kalbitzer, Hans Robert


The phosphocarrier HPr (heat stable protein) of Staphylococcus carnosus was modified by site-directed mutagenesis of the corresponding ptsH gene in order to analyse the importance of amino acids which were supposed to be part of the active centre of the protein. Three residues which are conserved in all HPrs, Arg17, Pro18 and Glu84, were mutated: Arg17 was changed to His (17RH) and Pro18 and ...


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