1887

Abstract

Previous work has resulted in the isolation of several mutant glucose permeases (II or PtsG) of the phosphotransferase system (PTS) with altered N-terminal amphipathic leader sequences. The mutations were reported to (1) broaden permease substrate specificity, (2) promote facilitated diffusion of some sugars and (3) increase gene transcription. Detailed biochemical analyses were conducted, showing that one such mutant (V12F-II) (1) contains dramatically increased amounts of II, (2) displays correspondingly increased phosphorylation and transport activities, (3) shows increased utilization of several metabolizable sugars and (4) shows decreased susceptibility to detergent activation. These results are interpreted as suggesting that the V12F substitution in the N-terminal amphipathic leader sequence of II alters the facility with which the permease is integrated into the membrane. Consequent changes in conformation alter its catalytic properties and increase its affinity for the pleiotropic transcriptional repressor, Mlc. These changes together are proposed to promote transcription of the gene and account for the observed phenotypic changes.

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2003-03-01
2020-01-22
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