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Default Enzyme IIIlac of the staphylococcal phosphoenolpyruvate-dependent phosphotransferase

Enzyme IIIlac of the staphylococcal phosphoenolpyruvate-dependent phosphotransferase system: site-specific mutagenesis of histidine residues, biochemical characterization and 1H-NMR studies.

Related Articles Enzyme IIIlac of the staphylococcal phosphoenolpyruvate-dependent phosphotransferase system: site-specific mutagenesis of histidine residues, biochemical characterization and 1H-NMR studies.

Protein Eng. 1991 Apr;4(4):469-73

Authors: Finkeldei U, Kalbitzer HR, Eisermann R, Stewart GC, Hengstenberg W

The lactose-specific phosphocarrier protein enzyme III of the bacterial phosphoenol-pyruvate-dependent phosphotransferase system of Staphylococcus aureus was modified by site-specific mutagenesis on the corresponding lacF gene in order to replace the histidine residues 78 and 82 of the amino acid sequence with a serine residue. Wild-type and both mutant genes were overexpressed in Escherichia coli and the gene products were purified to homogeneity. The conformation of wild-type and mutant proteins were monitored by 1H-NMR spectroscopy. In vitro phosphorylation studies on mutant lactose-specific enzyme III, as well as evidence from NMR spectroscopy, lead to the conclusion that His78 is the active-site for phosphorylation of lactose-specific enzyme III by phospho-HPr (histidine-containing protein). The role of His82 probably is the enhancement of velocity and efficiency of the phosphotransfer from lactose-specific enzyme III to lactose-specific enzyme II. This result refutes the conclusion of former work based on data by protelytic cleavage and sequencing of the 32P-labeled peptide of lactose-specific enzyme III that His82 is the active-site for phosphorylation.

PMID: 1881873 [PubMed - indexed for MEDLINE]



Source: PubMed
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