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Expression of the genes for the membrane-bound Fo sector of theEscherichia coli F1 Fo proton-translocating ATPase can respond to changes in metabolic conditions, and these changes are reflected in alterations in the subunit stoichiometry of the oligomeric Fo proton channel. Transcriptional and translationallacZ fusions to the promoter and to two Fo genes show that, during growth on the nonfermentable carbon source succinate, transcription of the operon and translation ofuncB , encoding the a subunit of Fo , are higher than during growth on glucose. In contrast, translation of theuncE gene, encoding the c subunit of Fo , is higher during growth on glucose than during growth on succinate. Translation rates of bothuncB anduncE change as culture density increases, but transcription rates do not. Quantitation of the c stoichiometry shows that more c subunits are assembled into the F1 Fo ATPase in cells grown on glucose than in cells grown on succinate.E. coli therefore appears to have a mechanism for regulating the composition and, presumably, the function of the ATPase in response to metabolic circumstances.

journal of bacteriology

Effects of Carbon Source on Expression of F o Genes and on the Stoichiometry of the c Subunit in the F 1 F o ATPase of Escherichia coli