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Coordination of Ubiquinol Oxidase and Cytochrome cbb₃ Oxidase Expression by Multiple Regulators in Rhodobacter capsulatus

Department of Biology, Indiana University, Bloomington, Indiana 47405

Received 7 August 2001/ Accepted 24 January 2002

Rhodobacter capsulatus utilizes two terminal oxidases for aerobic respiration, cytochrome cbb₃ and ubiquinol oxidase. To determine the transcription factors involved in terminal oxidase expression, ccoN-lacZ and cydA-lacZ protein fusions were assayed in a variety of regulatory mutants. The results of this and previous studies indicate that cytochrome cbb₃ expression is controlled by regB-regA, fnrL, and hvrA and that ubiquinol oxidase expression is controlled by regB-regA, fnrL, hvrA, crtJ, and aerR.

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