Mechanism of catalytic nitric oxide reduction by membrane-bound nitric oxide reductase : comparison with oxygen reduction reaction

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Structures of reduced and CN-bound oxidized nitric oxide reductase(NOR), which is involved in anaerobic respiration chain, were determined by X-ray crystallography. Resonance Raman measurement indicated that the substrate, NO, bound to the active site heme in a bent conformation. The proton transfer mechanism was also examined by molecular dynamics simulation, suggesting the structural factor(s) controlling the catalytic proton transfer in NOR. These findings help us understanding the molecular mechanism of the NO reduction reaction in NOR and the functional conversion from NOR to aerobic respiration enzyme during the molecular evolution.