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. 1973 Jan;113(1):512-4.
doi: 10.1128/jb.113.1.512-514.1973.

Characterization of constitutive galactose permease mutants in Salmonella typhimurium

M H Saier Jr, F G Bromberg, S Roseman

Characterization of constitutive galactose permease mutants in Salmonella typhimurium

M H Saier Jr et al. J Bacteriol. 1973 Jan.

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.

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References

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