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Journal of Bacteriology, May 2001, p. 3050-3054, Vol. 183, No. 10
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.10.3050-3054.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Enzymatic Removal of Nitric Oxide Catalyzed by Cytochrome c' in Rhodobacter capsulatus

Richard Cross,1 David Lloyd,2 Robert K. Poole,1 and James W. B. Moir1,*

Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN,1 and School of Pure and Applied Biology, University of Wales, Cardiff, CF1 3TL,2 United Kingdom

Received 18 September 2000/Accepted 9 February 2001

Cytochrome c' from Rhodobacter capsulatus has been shown to confer resistance to nitric oxide (NO). In this study, we demonstrated that the amount of cytochrome c' synthesized for buffering of NO is insufficient to account for the resistance to NO but that the cytochrome-dependent resistance mechanism involves the catalytic breakdown of NO, under aerobic and anaerobic conditions. Even under aerobic conditions, the NO removal is independent of molecular oxygen, suggesting cytochrome c' is a NO reductase. Indeed, we have measured the product of NO breakdown to be nitrous oxide (N2O), thus showing that cytochrome c' is behaving as a NO reductase. The increased resistance to NO conferred by cytochrome c' is distinct from the NO reductase pathway that is involved in denitrification. Cytochrome c' is not required for denitrification, but it has a role in the removal of externally supplied NO. Cytochrome c' synthesis occurs aerobically and anaerobically but is partly repressed under denitrifying growth conditions when other NO removal systems are operative. The inhibition of respiratory oxidase activity of R. capsulatus by NO suggests that one role for cytochrome c' is to maintain oxidase activity when both NO and O2 are present.

* Corresponding author. Mailing address: Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, United Kingdom. Phone: 44 (0) 114 2224409. Fax: 44 (0) 114 2728697. E-mail: j.moir{at}sheffield.ac.uk.

Journal of Bacteriology, May 2001, p. 3050-3054, Vol. 183, No. 10
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.10.3050-3054.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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