oxidoreductase activity, acting on a heme group of donors nitric oxide dioxygenase activity, heme protein as donor https://github.com/geneontology/go-ontology/issues/26482 https://github.com/geneontology/go-ontology/issues/30193 GO:0141118 Reactome:R-HSA-5340226 RHEA:78091 Catalysis of the reaction: Fe(II)-heme b-[protein] + nitric oxide + O2 = Fe(III)-heme b-[protein] + nitrate. Note that this activity is similar to nitric oxide dioxygenase activity ; GO:0008941, but GO:000894 uses NADPH as the electron donor. molecular_function 2023-11-23T12:37:09Z pg