<prompt> Copper containing enzyme is:Dopamine hydroxylaseDopamine decarboxylaseDopamine carboxylaseTyrosine hydroxylase  <response>: Ans. a Dopamine hydroxylaseRef: Harpers Biochemistry, 30lh edn. pg. 561 Those enzymes that require inorganic metal ions as their cofactor are termed as metalloenzymes aka cofactors. Dopamine hydroxylase is a copper-containing enzyme involved in the synthesis of the catecholamines: Norepinephrine and Epinephrine from tyrosine in the adrenal medulla and central nervous system. Ascorbic acid is also linked with copper containing hydroxylases such as peptidoglycine hydroxylase and dopamine hydroxylase. Dopamine decarboxylase requires pyridoxal phosphate for the conversion of L-dopa to 3,4-dihydroxyphenylethylamine.Metals and their MetalloenzymesMetalMetalloenzymesCopperCytochrome oxidase, Lysyl oxidase, Dopamine Hydroxylase, ascorbic acid oxidase, Tyrosinase, Ferroxidase Ceruloplasmin, Superoxide DismutaseMagnesiumHexokinase, PFK, Glucose-6-phosphatase, Kinases, Thermostable DNA polymerases, Enolase, Creatinine kinaseSeleniumGlutathione peroxidaseMolybdenumXanthine oxidaseCalciumLipase, LecithinaseIronCytochrome oxidase, Xanthine oxidase, Catalase, PeroxidaseNickelUrease 