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J Bacteriol, April 1998, p. 2228-2231, Vol. 180, No. 8
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Oxygen Regulation of the ccoN Gene Encoding a Component of the cbb3 Oxidase in Rhodobacter sphaeroides 2.4.1T: Involvement of the FnrL Protein

Nigel J. Mouncey and Samuel Kaplan*

Department of Microbiology and Molecular Genetics, The University of Texas Health Science Center Medical School, Houston, Texas 77030

Received 4 December 1997/Accepted 3 February 1998

The ccoNOQP gene cluster of Rhodobacter sphaeroides 2.4.1T encodes a cbb3 cytochrome oxidase which is utilized in oxygen-limited conditions for aerobic respiration. The beta -galactosidase activity of a ccoN::lacZ transcriptional fusion was low under high (30%)-oxygen and anaerobic growth conditions. Maximal ccoN::lacZ expression was observed when the oxygen concentration was lowered to 2%. In an FnrL mutant, ccoN::lacZ expression was significantly lower than in the wild-type strain, suggesting that FnrL is a positive regulator of genes encoding the cbb3 oxidase.

* Corresponding author. Mailing address: Department of Microbiology and Molecular Genetics, The University of Texas Health Science Center Medical School, 6431 Fannin, Houston, TX 77030. Phone: (713) 500-5502. Fax: (713) 500-5499. E-mail: skaplan{at}utmmg.med.uth.tmc.edu.




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