Abstract

Nitrous oxide reductase (N2OR) is the terminal reductase in a respiratory chain converting N2O to N2 in the denitrifying bacteria: $${N_2}O + 2{H^ + } + 2{e^ - } \to {N_2} + {H_2}O$$ ([1]) Principal aspects of the subject have been covered recently, and these reviews may be consulted for primary reference.1,2 The high activity form of the enzyme from Pseudomonas stutzeri (N2OR I) has two identical subunits, each carrying a mixed-valence [Cu(1.5)...Cu(1.5)], S = 1/2 complex.3 A catalytically inactive derivative of the enzyme (N2OR V) has also the mixed-valence EPR-detectable site.4,5

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