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• W2007204037 endingPage "539" @default.
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• W2007204037 abstract "Density functional methods have been applied to investigate the properties of the active site of copper-containing nitrite reductases and possible reaction mechanisms for the enzyme catalysis. The results for a model of the active site indicate that a hydroxyl intermediate is not formed during the catalytic cycle, but rather a state with a protonated nitrite bound to the reduced copper. Electron affinity calculations indicate that reduction of the T2 copper site does not occur immediately after nitrite binding. Proton affinity calculations are indicative of substantial pK(a) differences between different states of the T2 site. The calculations further suggest that the reaction does not proceed until uptake of a second proton from the bulk solution. They also indicate that Asp-92 may play both a key role as a proton donor to the substrate, and a structural role in promoting catalysis. In the D92N mutant another base, presumably a nearby histidine (His-249) may take the role as the proton donor. On the basis of these model calculations and available experimental evidence, an ordered reaction mechanism for the reduction of nitrite is suggested. An investigation of the binding modes of the nitric oxide product and the nitrite substrate to the model site has also been made, indicating that nitric oxide prefers to bind in an end-on fashion to the reduced T2 site." @default.
• W2007204037 created "2016-06-24" @default.
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• W2007204037 date "2006-01-01" @default.
• W2007204037 modified "2023-10-18" @default.
• W2007204037 title "Elucidating the mechanism for the reduction of nitrite by copper nitrite reductase—A contribution from quantum chemical studies" @default.
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• W2007204037 doi "https://doi.org/10.1002/jcc.20567" @default.
• W2007204037 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17186474" @default.
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