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J Bacteriol. 1994 June; 176(11): 3148-3153

research-article

Organization of the hao gene cluster of Nitrosomonas europaea: genes for two tetraheme c cytochromes.

Department of Genetics and Cell Biology, University of Minnesota, St. Paul 55108.

ABSTRACT

The organization of genes for three proteins involved in ammonia oxidation in Nitrosomonas europaea has been investigated. The amino acid sequence of the N-terminal region and four heme-containing peptides produced by proteolysis of the tetraheme cytochrome c554 of N. europaea were determined by Edman degradation. The gene (cycA) encoding this cytochrome is present in three copies per genome (H. McTavish, F. LaQuier, D. Arciero, M. Logan, G. Mundfrom, J.A. Fuchs, and A. B. Hooper, J. Bacteriol. 175:2445-2447, 1993). Three clones, representing at least two copies of cycA, were isolated and sequenced by the dideoxy-chain termination procedure. In both copies, the sequences of 211 amino acids derived from the gene sequence are identical and include all amino acids predicted by the proteolytic peptides. In two copies, the cycA open reading frame (ORF) is followed closely (three bases in one copy) by a second ORF predicted to encode a 28-kDa tetraheme c cytochrome not previously characterized but similar to the nirT gene product of Pseudomonas stutzeri. In one copy of the cycA gene cluster, the second ORF is absent.

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