Phosphorylation of hexoses in Streptomyces aureofaciens: Evidence that the phosphoenolpyruvate: Sugar phosphotransferase system is not operative

Abstract Sugar phosphates are formed in cell-free extracts of Streptomyces aureofaciens RIA57 from glucose or fructose in the presence of phosphoenolpyruvate. In contrast to the phosphorylation by adenosine 5'-triphosphate the kinetics of formation of glucose 6-phosphate via phosphoenolpyruvate (PEP) is nonlinear. The product of fructose phosphorylation (only fructose 6-phosphate was determined by paper chromatography) and the absence of 1-phosphofructokinase indicate that fructose metabolism in S. aureofaciens does not proceed via the phosphoenolpyruvate:sugar phosphotransferase system (PTS).