glutamate decarboxylase activity Catalysis of the reaction: L-glutamate = 4-aminobutanoate + CO2. EC:4.1.1.15 GO:0004351 L-aspartate-alpha-decarboxylase activity L-glutamate 1-carboxy-lyase (4-aminobutanoate-forming) L-glutamate 1-carboxy-lyase activity L-glutamate alpha-decarboxylase activity L-glutamic acid decarboxylase activity L-glutamic decarboxylase activity MetaCyc:GLUTDECARBOX-RXN RHEA:17788 Reactome:REACT_23866 Reactome:REACT_23937 aspartic alpha-decarboxylase cysteic acid decarboxylase activity gamma-glutamate decarboxylase activity molecular_function