O-acetylhomoserine aminocarboxypropyltransferase activity carbon-oxygen lyase activity O-acetylhomoserine sulfhydrylase activity https://github.com/geneontology/go-ontology/issues/28681 https://github.com/geneontology/go-ontology/issues/30193 molecular_function homocysteine synthase GO:0051009 Catalysis of the reaction: O-acetyl-L-homoserine + hydrogen sulfide = homocysteine + acetate. MetaCyc:ACETYLHOMOSER-CYS-RXN RHEA:27822