Kiyohito Murai, Katsuhide Miyake, Jun Andoh, Shinji Iijima
{"title":"Cloning and nucleotide sequence of the nitric oxide reductase locus in Paracoccus denitrificans IFO 12442","authors":"Kiyohito Murai, Katsuhide Miyake, Jun Andoh, Shinji Iijima","doi":"10.1016/S0922-338X(98)80158-X","DOIUrl":null,"url":null,"abstract":"<div><p>A 5.2-kb DNA fragment containing the upstream region of the nitrite reductase gene (<em>nirS</em>) was cloned from <em>Paracoccus denitrificans</em> IFO 12442 and its DNA sequence was determined. In this fragment, four open reading frames (ORFs) were observed. Among these, two ORFs, located 3 kb upstream of the <em>nirS</em> gene were found to encode nitric oxide reductase (<em>norC, norB</em>) by homology analysis. The <em>norC</em> and <em>norB</em> encoded cytochrome <em>c</em> and <em>b</em> subunits of the enzyme, and the predicted molecular weights of the protein products were 17 kDa (150 amino acid residues) and 52.5 kDa (462 amino acid residues), respectively. The other two open reading frames, designated ORF1 (73 kDa, 681 amino acid residues) and ORF2 (32.5 kDa, 304 amino acid residues), were found between the <em>nir</em> and <em>nor</em> genes. The deduced amino acid sequence of ORF1 showed high similarity (35% identity) to that of NosR which is known to be a transcriptional regulatory protein for the N<sub>2</sub>O reductase gene cluster of <em>Pseudomonas stutzeri</em>. Since the ORF1 protein has a well conserved cysteine cluster and 5 hydrophobic transmembrane repeats similar to those of the NosR protein, ORF1 probably functions as a membrane bound sensor for denitrification. Northern blot analysis indicated that the ORF1–2 and <em>norCB</em> regions are probably transcribed as independent operons.</p></div>","PeriodicalId":15696,"journal":{"name":"Journal of Fermentation and Bioengineering","volume":"86 5","pages":"Pages 494-499"},"PeriodicalIF":0.0000,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0922-338X(98)80158-X","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Fermentation and Bioengineering","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0922338X9880158X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
A 5.2-kb DNA fragment containing the upstream region of the nitrite reductase gene (nirS) was cloned from Paracoccus denitrificans IFO 12442 and its DNA sequence was determined. In this fragment, four open reading frames (ORFs) were observed. Among these, two ORFs, located 3 kb upstream of the nirS gene were found to encode nitric oxide reductase (norC, norB) by homology analysis. The norC and norB encoded cytochrome c and b subunits of the enzyme, and the predicted molecular weights of the protein products were 17 kDa (150 amino acid residues) and 52.5 kDa (462 amino acid residues), respectively. The other two open reading frames, designated ORF1 (73 kDa, 681 amino acid residues) and ORF2 (32.5 kDa, 304 amino acid residues), were found between the nir and nor genes. The deduced amino acid sequence of ORF1 showed high similarity (35% identity) to that of NosR which is known to be a transcriptional regulatory protein for the N2O reductase gene cluster of Pseudomonas stutzeri. Since the ORF1 protein has a well conserved cysteine cluster and 5 hydrophobic transmembrane repeats similar to those of the NosR protein, ORF1 probably functions as a membrane bound sensor for denitrification. Northern blot analysis indicated that the ORF1–2 and norCB regions are probably transcribed as independent operons.