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J. Biol. Chem., Vol. 262, Issue 34, 16444-16449, Dec, 1987

Identification of the genes for the lactose-specific components of the phosphotransferase system in the lac operon of Staphylococcus aureus

F Breidt Jr, W Hengstenberg, U Finkeldei and GC Stewart
Department of Microbiology, University of Kansas, Lawrence 60645.

The nucleotide and deduced amino acid sequences of the lacE and lacF genes, which code for the lactose-specific Enzyme II and Enzyme III of the Staphylococcus aureus phosphotransferase system, are presented. The primary translation products consist of a hydrophobic protein of 572 amino acids (Mr = 62,688) and a polypeptide of 103 amino acids (Mr = 11,372), respectively. The assignment of lacF as the gene for Enzyme IIIlac was based upon the known amino acid sequence of the protein. The identity of lacE as encoding Enzyme IIlac was based upon immunoreactivity of the cloned gene product with antibodies raised against purified Enzyme IIlac from S. aureus and an assay of biological function of the protein expressed in Escherichia coli. The order of the known genes of the S. aureus lac operon is lacF-lacE-lacG, the latter encoding phospho-beta-galactosidase.
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