we have investigated the transport of these sugars and their non-metabolizable analogs in mutant strains lacking the phospho-carrier proteins of the phosphoenolpyruvate : sugar phosphotransferase system , the enzymes i and hpr , to determine whether the sugar-specific , membrane-bound components of the phosphonenolpyruvate : sugar phosphotransferase system , the enzymes ii , can catalyze the uptake of these sugars in the absence of phosphorylation .
C0031727
phosphotransferase
C0031715
phosphorylation