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Journal of Bacteriology, October 2005, p. 6849-6851, Vol. 187, No. 19
0021-9193/05/$08.00+0 doi:10.1128/JB.187.19.6849-6851.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Novel nirK Cluster Genes in Nitrosomonas europaea Are Required for NirK-Dependent Tolerance to Nitrite
Hubertus J. E. Beaumont,*
Sylvia I. Lens,
Hans V. Westerhoff, and
Rob J. M. van Spanning
BioCentrum Amsterdam, Department of Molecular Cell Physiology, Vrije Universiteit, de Boelelaan 1087, NL-1081 HV Amsterdam, The Netherlands
Received 5 June 2005/
Accepted 20 July 2005
Nitrite reductase (NirK) of Nitrosomonas europaea confers tolerance to nitrite (NO2). The nirK gene is clustered with three genes of unknown physiological function: ncgABC. At present, this organization is unique to nitrifying bacteria. Here we report that the ncgABC gene products facilitate NirK-dependent NO2 tolerance by reversing the negative physiological effect that is associated with the activity of NirK in their absence. We hypothesize that the ncg gene products are involved in the detoxification of nitric oxide that is produced by NirK.
* Corresponding author. Present address: Evolutionary Genetics and Microbial Ecology Laboratory, School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand. Phone: (64) 9 373 7599, ext. 82777. Fax: (64) 9 373 7416. E-mail:
h.beaumont{at}auckland.ac.nz.
Journal of Bacteriology, October 2005, p. 6849-6851, Vol. 187, No. 19
0021-9193/05/$08.00+0 doi:10.1128/JB.187.19.6849-6851.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
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