ID 2.5.1.48 DE cystathionine gamma-synthase. AN cystathionine synthase. AN cystathionine synthetase. AN homoserine transsuccinylase. AN O-succinylhomoserine (thiol)-lyase. AN O-succinylhomoserine synthase. AN O-succinylhomoserine synthetase. AN O-succinyl-L-homoserine succinate-lyase (adding cysteine). CA L-cysteine + O-succinyl-L-homoserine = H(+) + L,L-cystathionine + CA succinate. CC -!- Also reacts with H2S and methanethiol as replacing agents, producing CC homocysteine and methionine, respectively. CC -!- In the absence of thiol, can also catalyze beta,gamma-elimination to CC form 2-oxobutanoate, succinate and ammonia. CC -!- Formerly EC 4.2.99.9. DR P55217, CGS1_ARATH ; Q9C876, CGS2_ARATH ; P38675, MET7_NEUCR ; DR O74314, MET7_SCHPO ; P47164, MET7_YEAST ; P00935, METB_ECOLI ; DR P44502, METB_HAEIN ; Q9ZMW7, METB_HELPJ ; Q1M0P5, METB_HELPX ; DR P56069, METB_HELPY ; P24601, METB_HERAU ; P66876, METB_MYCBO ; DR P46807, METB_MYCLE ; P9WGB6, METB_MYCTO ; P9WGB7, METB_MYCTU ; DR Q04533, METX_YEAST ; //