transferase activity, transferring alkyl or aryl (other than methyl) groups uracilylalanine synthase activity isowillardiine synthase activity willardiine synthase activity Catalysis of the reaction: O3-acetyl-L-serine + uracil = 3-(uracil-1-yl)-L-alanine + acetate. O3-acetyl-L-serine acetate-lyase (adding uracil) RHEA:11496 O3-acetyl-L-serine:uracil 1-(2-amino-2-carboxyethyl)transferase activity molecular_function GO:0050471 O(3)-acetyl-L-serine acetate-lyase (adding uracil) activity 3-O-acetyl-L-serine:uracil 1-(2-amino-2-carboxyethyl)transferase activity EC:2.5.1.53 MetaCyc:RXN-7541