Enzyme:4.2.1.22

Upper Levels: EC4.-.-.- Lyases. : EC4.2.-.- Carbon-oxygen lyases. : EC4.2.1.- Hydro-lyases.

IDs and Links
IUBMB	EC4
ExPaSy	NiceZyme 4.2.1.22

L-serine hydro-lyase (adding homocysteine)
Systematic Name	L-serine hydro-lyase (adding homocysteine)
Common Name	cystathionine beta-synthase serine sulfhydrase beta-thionase methylcysteine synthase serine sulfhydrylase

L-Homocysteine + L-Serine => L-Cystathionine + H2O (links: L-Homocysteine + (2S) -2-Amino-3-hydroxypropanoic acid = L-Cystathionine)
L-Homocysteine <Mapping> AtomMap:BMAAS4SF0002$BMFYB4CAf021$0 L-Cystathionine 1 ↔ 1 2 ↔ 2 3 ↔ 3 4 ↔ 4 5 ↔ 5 6 ↔ 6 (2S) -2-Amino-3-hydroxypropanoic acid <Mapping> AtomMap:BMAAS3HO0002$BMFYB4CAf021$0 L-Cystathionine 1 ↔ 7 2 ↔ 8 3 ↔ 9 4 ↔ 10

Seleno-L-homocysteine + L-Serine => Seleno-L-cystathionine + H2O (links: Seleno-L-homocysteine + (2S) -2-Amino-3-hydroxypropanoic acid = Seleno-L-cystathionine)
Seleno-L-homocysteine <Mapping> AtomMap:BMAXS4MT0001$BMAXDP--c016$0 Seleno-L-cystathionine 1 ↔ 5 2 ↔ 6 3 ↔ 7 4 ↔ 8 5 ↔ 9 (2S) -2-Amino-3-hydroxypropanoic acid <Mapping> AtomMap:BMAAS3HO0002$BMAXDP--c016$0 Seleno-L-cystathionine 1 ↔ 1 2 ↔ 2 3 ↔ 3 4 ↔ 4