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. 1994 Jan;176(2):504–510. doi: 10.1128/jb.176.2.504-510.1994

Characterization of the gene encoding hydroxylamine oxidoreductase in Nitrosomonas europaea.

L A Sayavedra-Soto 1, N G Hommes 1, D J Arp 1
PMCID: PMC205074  PMID: 8288544

Abstract

Hydroxylamine oxidoreductase (HAO) catalyzes the oxidation of hydroxylamine to nitrite in Nitrosomonas europaea. The electrons released in the reaction are partitioned to ammonium monooxygenase and to the respiratory chain. The immediate acceptor of electrons from HAO is believed to be cytochrome c-554 (Cyt c-554). We have isolated a genomic DNA fragment containing the structural gene encoding HAO (hao) and a part of the gene for Cyt c-554. The nucleotide sequence of hao was determined, and its transcription was analyzed. The open reading frame (ORF) encodes amino acid sequences matching the purified peptides of HAO. A 64.28-kDa protein is encoded in this ORF, in close agreement with the empirically determined molecular mass of 63 kDa. The N terminus was located 24 amino acids from the start codon, suggesting the presence of a leader sequence. The putative eight heme-binding peptides were localized in this ORF. The gene for Cyt c-554 was located 1,200 bp downstream from the 3' end of hao. An ORF was identified in the upstream region from hao and may encode a protein of unknown function. Data bank searches did not reveal proteins with substantial similarities to HAO, but they did reveal similarities between Cyt c-554 and other c-type cytochromes.

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Selected References

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