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Characterization of Constitutive Galactose Permease Mutants in Salmonella typhimurium

^a Department of Biology and The McCollum-Pratt Institute, The Johns Hopkins University, Baltimore, Maryland 21218

ABSTRACT

Salmonella typhimurium strains, lacking both enzyme I and the phosphocarrier protein, HPr, of the phosphoenolpyruvate-sugar phosphotransferase system, cannot transport or metabolize glucose and other sugar substrates of this enzyme system. Mutants which regain the ability to specifically utilize glucose were found to constitutively synthesize a galactose permease by virtue of a mutation in the galR gene. This permease, shown to be an active transport system, does not require HPr or enzyme I for activity.

¹ Present address: Department of Biology, University of California at San Diego, La Jolla, Calif. 92037.

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