Nitric oxide oscillations in Paracoccus denitrificans: the effects of environmental factors and of segregating nitrite reductase and nitric oxide reductase into separate cells

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Authors

KUŇÁK Michal KUČERA Igor VAN SPANNING Rob J.M.

Year of publication 2004
Type Article in Periodical
Magazine / Source Archives of biochemistry and biophysics
MU Faculty or unit

Faculty of Science

Citation
Web http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WB5-4D0Y364-2&_coverDate=09%2F15%2F2004&_alid=223287397&_rdoc=1&_fmt=&_orig=search&_qd=1&_cdi=6701&_sort=d&view=c&_acct=C000045159&_version=1&_urlVersion=0&_userid=835458&md5=e269cd2afbc12bda4bc9
Field Biochemistry
Keywords denitrification; nitrite reductase; nitric oxide reductase; substrate inhibition; concentration oscillations
Description Nitric oxide is a denitrification intermediate which is produced from nitrite and then further converted via nitrous oxide to nitrogen. Here, the effect of low concentrations of the protonophore carbonylcyanide m-chlorophenylhydrazone on the time courses for dissolved gases was examined. While NO was found to oscillate, N(2)O only increased gradually as the reduction of nitrite progressed. The frequency and shape of protonophore-induced NO oscillations were influenced by temperature and the concentration of electron donor N,N,N',N'-tetramethyl-p-phenylene diamine (TMPD) in a manner compatible with the observed differential effects on the two involved enzyme activities. We demonstrated the existence of a pH interval, where [NO] oscillates even without uncoupler addition. Occurrence of nitric oxide oscillations in mixtures of a nitrite reductase mutant with a nitric oxide reductase mutant suggests that they cannot be due to a competition of the enzymes for redox equivalents from one common respiratory chain.
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