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Induction of theEscherichia coli K-12ynfEFGHI operon in response to anaerobiosis is repressed by nitrate ions. In this study, we show that the global transcription factor FNR is a class II activator at theynfEFGHI promoter and that NarL represses activation by binding to a single target that overlaps the promoter −10 element. Electromobility shift assays show that NarL does not prevent RNA polymerase binding and suggest that repression may involve a quaternary NarL-FNR-RNA polymerase-promoter complex.

Activation and Repression at the Escherichia coli ynfEFGHI Operon Promoter