title: S-phosphocysteine and phosphohistidine are intermediates in the phosphoenolpyruvate-dependent mannitol transport catalyzed by Escherichia coli EIIMtl.
abstract: During a cycle of mannitol transport and phosphorylation, the phosphoryl group originating on P-enolpyruvate is transferred, consecutively, to two sites on the Escherichia coli mannitol-specific carrier (EIIMtl) before being placed on mannitol [Pas et al. (1988) Biochemistry (in press)]. The peptides constituting the two EIIMtl phosphorylation sites have been isolated and identified after labeling with [32P]-P-enolpyruvate. The first site is localized in peptide Leu 541-Lys 560. The hydrolysis characteristics of the phosphorylated peptide indicate that a histidine residue is phosphorylated. The second site is located in peptide Ile 380-Met 393, which contains the activity-linked cysteine (384) [Pas & Robillard (1988) Biochemistry (in press)]. The hydrolysis characteristics of the phosphopeptide indicate that Cys 384 is the site of phosphorylation.
mesh_terms: D001665:Binding Sites; D001693:Biological Transport, Active; D003545:Cysteine / Q000031:analogs & derivatives / Q000378:metabolism; D004926:Escherichia coli / Q000378:metabolism; D029968:Escherichia coli Proteins; D006639:Histidine / Q000031:analogs & derivatives / Q000378:metabolism; D008353:Mannitol / Q000378:metabolism*; D009004:Monosaccharide Transport Proteins; D010728:Phosphoenolpyruvate / Q000378:metabolism; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System / Q000378:metabolism*; D010766:Phosphorylation
chemical_list: D029968:Escherichia coli Proteins; D009004:Monosaccharide Transport Proteins; C057779:S-phosphocysteine; D008353:Mannitol; D006639:Histidine; D010728:Phosphoenolpyruvate; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System; C022358:mannitol PTS permease, E coli; D003545:Cysteine; C005436:phosphohistidine