title: A sensitive radiometric assay for cysteic acid decarboxylase activity in crude enzyme preparations of rat liver and brain.
abstract: 1. A method is described for the synthesis of L-[U-14C]cysteic acid from L-[U-14C] cysteine hydrochloride and for its subsequent utilisation as a substrate for cysteic acid decarboxylase activity in liver and brain. 2. The enzyme determination relies on the entrapment of radio-labelled carbon dioxide in Hyamine hydroxide. 3. The assay is sensitive, reliable and convenient and is particularly suitable for measuring the activity of the decarboxylase in crude enzyme preparations.
mesh_terms: D000818:Animals; D001921:Brain / Q000201:enzymology*; D002262:Carboxy-Lyases / Q000378:metabolism*; D003544:Cysteic Acid / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D008099:Liver / Q000201:enzymology*; D008297:Male; D011874:Radiometry; D051381:Rats; D011919:Rats, Inbred Strains; D013379:Substrate Specificity
chemical_list: D003544:Cysteic Acid; D002262:Carboxy-Lyases; C019967:cysteic acid decarboxylase