cystathionine gamma-synthase activity https://github.com/geneontology/go-ontology/issues/28811 GO:0000505 cystathionine synthase activity cystathionine synthetase activity homoserine transsuccinylase activity O-succinyl-L-homoserine (thiol)-lyase activity homoserine O-transsuccinylase activity O-succinyl-L-homoserine succinate-lyase (adding cysteine) activity RHEA:20397 O-succinylhomoserine synthetase activity GO:0003962 cystathionine gamma synthase activity cystathionine gamma-synthase activity (acts on O-phosphohomoserine) O4-succinyl-L-homoserine:L-cysteine S-(3-amino-3-carboxypropyl)transferase activity MetaCyc:O-SUCCHOMOSERLYASE-RXN O-succinylhomoserine synthase activity O-succinylhomoserine (thiol)-lyase activity molecular_function EC:2.5.1.48 cystathionine g-synthase activity Catalysis of the reaction: L-cysteine + O-succinyl-L-homoserine = H+ + L,L-cystathionine + succinate. O-succinyl-L-homoserine succinate-lyase activity CTT gamma synthase activity transferase activity, transferring alkyl or aryl (other than methyl) groups