Streptomyces liwidans, S. coelicolor and S. griseohscus were examined for the presence of the enzymes of the phosphoenolpyruvate : sugar phosphotransferase system (PTS). All three species were shown to possess Enzyme I, HPr and fructose-specific Enzyme II (IIFN) activities. In 5. liwidans and 5. coelicolor, all three PTS enzymes were fructose-inducible, but in 5. griseokrscus the system was expressed constitutively. These organisms apparently lack the HPr(Ser) kinase and HPr(Ser-P) phosphatase that characterize low-GC Gram-positive bacteria.

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