retrieval

1) ==> enzymatic reaction ENZYME: monoamine oxidase SUBSTRATE: dopamine O2 H2O PRODUCT: 3,4-dihydroxy-phenylacetate hydrogen peroxide NH3 2) ==> enzymatic reaction ENZYME: catechol O-methyl transferase {CYTOPLASM} {CELLULAR_MEMBRANE} SUBSTRATE: dopamine S-adenosylmethionine PRODUCT: 3-methoxydopamine S-adenosylhomocysteine 3) ==> enzymatic reaction ENZYME: dopa decarboxylase SUBSTRATE: levodopa PRODUCT: dopamine 4) ==> enzymatic reaction ENZYME: dopamine beta-hydroxylase {CYTOPLASM} {CELLULAR_MEMBRANE} SUBSTRATE: dopamine PRODUCT: norepinephrine