Two Conserved Glutamates in the Bacterial Nitric Oxide Reductase Are Essential for Activity but Not Assembly of the Enzyme
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15 صفحه اولA new assay for nitric oxide reductase reveals two conserved glutamate residues form the entrance to a proton-conducting channel in the bacterial enzyme.
A specific amperometric assay was developed for the membrane-bound NOR [NO (nitric oxide) reductase] from the model denitrifying bacterium Paracoccus denitrificans using its natural electron donor, pseudoazurin, as a co-substrate. The method allows the rapid and specific assay of NO reduction catalysed by recombinant NOR expressed in the cytoplasmic membranes of Escherichia coli. The effect on ...
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15 صفحه اولProton transfer in bacterial nitric oxide reductase.
The NOR (nitric oxide reductase) from Paracoccus denitrificans catalyses the two-electron reduction of NO to N(2)O (2NO+2H(+)+2e(-)-->N(2)O+H(2)O). The NOR is a divergent member of the superfamily of haem-copper oxidases, oxygen-reducing enzymes which couple the reduction of oxygen with translocation of protons across the membrane. In contrast, reduction of NO catalysed by NOR is non-electrogen...
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ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 2001
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.183.1.189-199.2001