sulfite oxidase activity https://github.com/geneontology/go-ontology/issues/28526 EC:1.8.3.1 Catalysis of the reaction: H2O + O2 + sulfite = H2O2 + H+ + sulfate. sulfite:oxygen oxidoreductase activity KEGG_REACTION:R00533 RHEA:24600 Reactome:R-HSA-1614544 MetaCyc:SULFITE-OXIDASE-RXN Note that this term has a MetaCyc pathway reference as the pathway only has a single step. sulphite oxidase activity GO:0008482 oxidoreductase activity, acting on a sulfur group of donors, oxygen as acceptor