Cysteine phosphorylation of the glucose transporter of Escherichia coli.
The glucose transporter (IIBCGlc/IIAGlc complex) of the bacterial phosphotransferase system couples vectorial translocation to phosphorylation of the transported sugar. The IIAGlc subunit transfers the phosphoryl group from the phosphoryl carrier protein P-HPr to the IIBCGlc subunit. IIBCGlc translocates and phosphorylates glucose. The site of IIBCGlc phosphorylation is cysteine 421 as shown by mass spectrometric and biochemical analyses of phosphorylated peptides. Site-directed mutagenesis of Cys421 (C421S) afforded a stable but completely inactive protein (Nuoffer, C., Zanolari, B., and Erni, B. (1988) J. Biol. Chem. 263, 6647-6655). Cys421 is located in the C-terminal cytoplasmic domain of the IIBCGlc subunit in a sequence context (LDACITRL) which is well conserved in other transporters of the bacterial phosphotransferase system. Phosphocysteine has been shown previously to be the catalytic intermediate of the mannitol transporter (Pas, H. H., Meyer, G. H., Kruizinga, W. H., Tamminga, K. S., van Weeghel, R. P., and Robillard, G. T.
Department of Microbiology, University of Basel, Switzerland.
M
M
Meins
P
P
Jenö
D
D
Müller
W J
WJ
Richter
J P
JP
Rosenbusch
B
B
Erni
D000595:Amino Acid Sequence; D002851:Chromatography, High Pressure Liquid; D003545:Cysteine / Q000378:metabolism*; D004926:Escherichia coli / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D009004:Monosaccharide Transport Proteins / Q000737:chemistry / Q000378:metabolism*; D010446:Peptide Fragments / Q000737:chemistry / Q000302:isolation & purification; D010728:Phosphoenolpyruvate / Q000378:metabolism; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System / Q000737:chemistry / Q000378:metabolism*; D010748:Phosphopeptides / Q000737:chemistry / Q000302:isolation & purification; D010761:Phosphorus Radioisotopes; D010766:Phosphorylation
D009004:Monosaccharide Transport Proteins; D010446:Peptide Fragments; D010748:Phosphopeptides; D010761:Phosphorus Radioisotopes; D010728:Phosphoenolpyruvate; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System; D003545:Cysteine