part of oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen, reduced flavin or flavoprotein as one donor, and incorporation of one atom of oxygen aflatoxin biosynthetic process aflatoxin B synthase activity https://github.com/geneontology/go-ontology/issues/28526 molecular_function 2019-11-29T11:06:07Z RHEA:35763 GO:0140399 MetaCyc:RXN-9497 EC:1.14.14.117 MetaCyc:RXN-9502 RHEA:35759 Catalyzes the reaction: 8-O-methylsterigmatocystin + 2 [reduced NADPH--hemoprotein reductase] + 2 O2 = aflatoxin B + 2 [oxidized NADPH--hemoprotein reductase] + H2O + methanol + CO2. Produces both aflatoxin B(1) and aflatoxin B(2). pg