S-(guanosine 3',5'-cyclic phosphate)-L-cysteinyl-[protein] + nitrite + H(+) => 8-nitro-cGMP + L-cysteinyl-[protein]
s-(guanosine 3',5'-cyclic phosphate)-l-cysteinyl-[protein] + nitrite + h(+) => 8-nitro-cgmp + l-cysteinyl-[protein]