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| Titel: |
Microbial and plant metabolism of NO |
| Auteur: |
W.J. Payne M.-Y. Liu S.A. Bursakov J. Le Gall |
| Verschenen in: |
BioFactors |
| Paginering: | Jaargang 6 (2001) nr. 1 pagina's 47-52 |
| Jaar: |
2001-04-01 |
| Inhoud: |
During microbial denitrification, NO is produced by reduction of nitrite by either the reduced high spin d<inf>1</inf> hemes in a unique reductase (NIR) or at the expense of a blue copper protein that transfers electrons that move first to a type I copper and then to a type II copper in a unique trimeric NIR. This latter type of NIR is also produced by several denitrifying filamentous fungi. Reduction of NO is then carried out by either a specific cytochrome bc complex NOR in denitrifying bacteria or a unique cytochrome P-450 in denitrifying filamentous fungi. NO is also produced by an anomalous reaction of a molybdoprotein, nitrate reductase (NAR), acting on an odd substrate, NO<inf>2</inf>-. NO is also reduced by a multiheme NIR that serves physiologically for reduction of NO<inf>2</inf>- to NH<inf>3</inf>. This type NIR reduces NO to either N<inf>2</inf>O, if only partially reduced, or NH<inf>3</inf>, if fully reduced, when it encounters NO. This multiheme NIR is very sensitive to cyanide. Transcription of the genes for NIR and NOR production in a denitrifier is activated by NO, a process that also requires the presence of the gene product, a transcriptional activator, NnrR. |
| Uitgever: |
IOS Press |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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