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Volume 146, Issue 2

Transcriptional analysis of the gene, encoding cytochrome nitrite reductase, of LMD 92.63

The GenBank accession number for the sequence in this paper is U75413.

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Abstract

The gene for cytochrome nitrite reductase of , a protein of known crystal structure, is . This gene is shown to be flanked by genes previously recognized in other organisms to encode proteins involved in the control of its transcription () and the biosynthesis of the cofactor (). Northern blot analysis has established under anaerobic conditions that a monocistronic transcript is produced from , in contrast to observations with other denitrifying bacteria in which arrangement of flanking genes is different and the messages produced are polycistronic. The lack of a transcript under aerobic conditions argues against a role for cytochrome in the previously proposed aerobic denitrification pathway in . A putative rho-independent transcription termination sequence immediately following , and preceding , can be identified. The independent transcription of and indicates that it should be possible to produce site-directed mutants of borne on a plasmid in a deletion mutant. The transcript start point for has been determined by two complementary techniques, 5′-RACE (apid mplification of DNA 5′ nds) and primer extension. It is 29 bp upstream of the AUG of . An anaerobox, which presumably binds Nnr, is centred a further 415 bp upstream of the transcript start. No standard σ DNA sequence motifs can be identified, but a conserved sequence (T-T-G/C-C-G/C-G/C) can be found in approximately the same position (−16) upstream of the transcript starts of and , whose products are both involved in the conversion of nitrite to nitric oxide.

  • Received:
  • Accepted:
  • Revised:
  • Published Online:
Keyword(s): 5′-RACE, rapid amplification of cDNA 5′ ends , denitrification , Fnr, fumarate nitrate reduction transcriptional activator , nitrite reductase , Nnr, nitrate nitrite reduction transcriptional activator , Paracoccus pantotrophus , promoter , transcription and TSS, transcript start site
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2000-02-01
2024-04-24
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Transcriptional analysis of the nirS gene, encoding cytochrome cd1 nitrite reductase, of Paracoccus pantotrophus LMD 92.63The GenBank accession number for the sequence in this paper is U75413.
Microbiology 146, 509 (2000); https://doi.org/10.1099/00221287-146-2-509
/content/journal/micro/10.1099/00221287-146-2-509
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