Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilyCystathionine synthase-like 8019978 4000672 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyPLP-dependent transferases 8032358 3000954 SCOP2 (2022-06-29)
BSCOP2B SuperfamilyPLP-dependent transferases 8032358 3000954 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ACys_Met_Meta_PP_Ce1cl1A1 A: a+b two layersX: C-terminal domain in some PLP-dependent transferases (From Topology)H: C-terminal domain in some PLP-dependent transferases (From Topology)T: C-terminal domain in some PLP-dependent transferasesF: Cys_Met_Meta_PP_CECOD (1.6)
ACys_Met_Meta_PP_Ne1cl1A2 A: a/b three-layered sandwichesX: PLP-dependent transferases (From Topology)H: PLP-dependent transferases (From Topology)T: PLP-dependent transferasesF: Cys_Met_Meta_PP_NECOD (1.6)
BCys_Met_Meta_PP_Ce1cl1B2 A: a+b two layersX: C-terminal domain in some PLP-dependent transferases (From Topology)H: C-terminal domain in some PLP-dependent transferases (From Topology)T: C-terminal domain in some PLP-dependent transferasesF: Cys_Met_Meta_PP_CECOD (1.6)
BCys_Met_Meta_PP_Ne1cl1B3 A: a/b three-layered sandwichesX: PLP-dependent transferases (From Topology)H: PLP-dependent transferases (From Topology)T: PLP-dependent transferasesF: Cys_Met_Meta_PP_NECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B
PF01053Cys/Met metabolism PLP-dependent enzyme (Cys_Met_Meta_PP)Cys/Met metabolism PLP-dependent enzymeThis family includes enzymes involved in cysteine and methionine metabolism. The following are members: Cystathionine gamma-lyase, Cystathionine gamma-synthase, Cystathionine beta-lyase, Methionine gamma-lyase, OAH/OAS sulfhydrylase, O-succinylhomos ...This family includes enzymes involved in cysteine and methionine metabolism. The following are members: Cystathionine gamma-lyase, Cystathionine gamma-synthase, Cystathionine beta-lyase, Methionine gamma-lyase, OAH/OAS sulfhydrylase, O-succinylhomoserine sulfhydrylase All of these members participate is slightly different reactions. All these enzymes use PLP (pyridoxal-5'-phosphate) as a cofactor.
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B
CYSTATHIONINE BETA-LYASE

Protein Modification Annotation

Modified Residue(s)
ChainResidue(s)Description
A, B
LLP Parent Component: LYS

RESIDAA0119

PSI-MOD :  N6-pyridoxal phosphate-L-lysine MOD:00128

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
cystathionine beta-lyase  M-CSA #449

Cystathionine beta-lyase is a member of the gamma family of PLP dependent enzymes, and cleaves C(beta)-S bonds in a variety of substrates. The enzyme is important in plant and microbial biosynthesis of methionine, catalysing the cleavage of L-cystathionine to L-homocysteine, pyruvate and ammonia.

The enzyme cleaves a carbon-sulfur bond, releasing L-homocysteine and an unstable enamine product that tautomerises to an imine form, which undergoes a hydrolytic deamination to form pyruvate and ammonia. The latter reaction can occur spontaneously. The enzyme from some sources also acts on L-cystine, forming pyruvate, ammonia and cysteine persulfide, and a number of related compounds.

Defined by 4 residues: ARG:A_2-58TYR:A-111ASP:A-185LYS:A-210
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