Titre
Inhibition of denitrification activity but not of mRNA induction in Paracoccus denitrificans by nitrite at a suboptimal pH.
Type
article
Institution
Externe
Périodique
Auteur(s)
Baumann, B.
Auteure/Auteur
van der Meer, J.R.
Auteure/Auteur
Snozzi, M.
Auteure/Auteur
Zehnder, A.J.
Auteure/Auteur
Liens vers les personnes
ISSN
0003-6072
Statut éditorial
Publié
Date de publication
1997
Volume
72
Numéro
3
Première page
183
Dernière page/numéro d’article
189
Peer-reviewed
Oui
Langue
anglais
Résumé
The influence of pH on the denitrification activity of a continuous culture of Paracoccus denitrificans was studied in relation to the presence of nitrite. After a transition from aerobic to anaerobic conditions at the suboptimal pH of 6.8, P. denitrificans was not able to build up a functional denitrification pathway. Nitrite accumulated in the medium as the predominant denitrification product. Although the nitrite reductase gene was induced properly, the enzyme could not be detected at sufficient amounts in the culture. These observations was somehow inhibited, or once synthesized nitrite reductase was inactivated, possibly by the high concentrations of nitrous acid (HNO2). Interestingly, when a P. denitrificans culture which was grown to steady-state under anaerobic conditions was then exposed to suboptimal pHs, cells exhibited a reduced overall denitrification activity, but neither nitrite nor any other denitrification intermediate accumulated.
Sujets
PID Serval
serval:BIB_80EEBDA16BE5
PMID
Date de création
2008-01-21T12:35:52.144Z
Date de création dans IRIS
2025-05-20T23:35:52Z