Abstract
In vivo and in vitro experiments are reported demonstrating that the catabolite repressor-activator (Cra) protein (formerly designated FruR) regulates expression of the cydAB operon of Escherichia coli encoding cytochrome d oxidase. The Fnr protein is required for Cra-mediated transcriptional control, but the ArcA protein antagonizes the response to Cra. The results establish that Fnr, ArcA, and Cra exert their effects in an interdependent fashion.
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