1.7.2.4 N2O + reduced acceptor - 1.7.2.4 N2O + reduced pseudoazurin blue copper electron-transfer protein pseudoazurin is capable of mediating electron transfer to the nitrous oxide reductase. Pseudoazurin binds near copper site CuA, with parameters consistent with the formation of a transient, weakly-bound complex. Pseudoazurin a strong candidate for the physiological electron donor to th enzyme 1.7.2.4 nitrogen + H2O + 2 ferricytochrome c - 1.7.2.4 nitrogen + H2O + acceptor - 1.7.2.4 nitrous oxide + 2 ferrocytochrome c + 2 H+ - 1.7.2.4 nitrous oxide + 2 reduced cytochrome c - 1.7.2.4 nitrous oxide + reduced acceptor - 1.7.2.4 nitrous oxide + reduced methyl viologen -