oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen, NAD(P)H as one donor, and incorporation of one atom of oxygen limonene monooxygenase activity limonene 1,2-monooxygenase [NAD(P)H) activity https://github.com/geneontology/go-ontology/issues/27866 https://github.com/geneontology/go-ontology/issues/28129 KEGG_REACTION:R09389 limonene 1,2-monooxygenase activity KEGG_REACTION:R06398 molecular_function UM-BBD_reactionID:r0733 RHEA:26089 GO:0052601 (S)-limonene,NAD(P)H:oxygen oxidoreductase activity (-)-limonene 1,2-monooxygenase activity RHEA:26093 RHEA:26097 (-)-limonene,NAD(P)H:oxygen oxidoreductase activity KEGG_REACTION:R09393 (S)-limonene 1,2-monooxygenase activity MetaCyc:RXN-9407 RHEA:26085 MetaCyc:RXN-9408 MetaCyc:RXN-9409 Catalysis of the reaction: limonene + NAD(P)H + H+ + O2 = NAD(P)+ + H2O + limonene-1,2-epoxide. Can use either (4S)-limonene or (4R)-limonene as substrate. NADPH can act instead of NADH, although more slowly. KEGG_REACTION:R09385 EC:1.14.13.107