Annotations: 1CL1

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1cl1a_	Alpha and beta proteins (a/b)	PLP-dependent transferase-like	PLP-dependent transferases	Cystathionine synthase-like	Cystathionine beta-lyase, CBL	(Escherichia coli K-12 ) [TaxId: 83333 ],	SCOPe (2.08)
B	d1cl1b_	Alpha and beta proteins (a/b)	PLP-dependent transferase-like	PLP-dependent transferases	Cystathionine synthase-like	Cystathionine beta-lyase, CBL	(Escherichia coli K-12 ) [TaxId: 83333 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Cystathionine synthase-like	8019978	4000672	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	PLP-dependent transferases	8032358	3000954	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	PLP-dependent transferases	8032358	3000954	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Cys_Met_Meta_PP_C	e1cl1A1	A: a+b two layers	X: 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 transferases	F: Cys_Met_Meta_PP_C	ECOD (1.6)
A	Cys_Met_Meta_PP_N	e1cl1A2	A: a/b three-layered sandwiches	X: PLP-dependent transferases (From Topology)	H: PLP-dependent transferases (From Topology)	T: PLP-dependent transferases	F: Cys_Met_Meta_PP_N	ECOD (1.6)
B	Cys_Met_Meta_PP_C	e1cl1B2	A: a+b two layers	X: 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 transferases	F: Cys_Met_Meta_PP_C	ECOD (1.6)
B	Cys_Met_Meta_PP_N	e1cl1B3	A: a/b three-layered sandwiches	X: PLP-dependent transferases (From Topology)	H: PLP-dependent transferases (From Topology)	T: PLP-dependent transferases	F: Cys_Met_Meta_PP_N	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.640.10	Alpha Beta	3-Layer(aba) Sandwich	Aspartate Aminotransferase	domain 2	CATH (4.3.0)
A	3.90.1150.10	Alpha Beta	Alpha-Beta Complex	Aspartate Aminotransferase, domain 1	Aspartate Aminotransferase, domain 1	CATH (4.3.0)
B	3.40.640.10	Alpha Beta	3-Layer(aba) Sandwich	Aspartate Aminotransferase	domain 2	CATH (4.3.0)
B	3.90.1150.10	Alpha Beta	Alpha-Beta Complex	Aspartate Aminotransferase, domain 1	Aspartate Aminotransferase, domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF01053	Cys/Met metabolism PLP-dependent enzyme (Cys_Met_Meta_PP)	Cys/Met metabolism PLP-dependent enzyme	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-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

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	CYSTATHIONINE BETA-LYASE	vitamin binding vitamin B6 binding pyridoxal phosphate binding ion binding binding organic cyclic compound binding anion binding heterocyclic compound binding small molecule binding carbon-sulfur lyase activity lyase activity cysteine-S-conjugate beta-lyase activity catalytic activity racemase activity, acting on amino acids and derivatives vitamin binding vitamin B6 binding pyridoxal phosphate binding ion binding binding organic cyclic compound binding anion binding heterocyclic compound binding small molecule binding carbon-sulfur lyase activity lyase activity cysteine-S-conjugate beta-lyase activity catalytic activity racemase activity, acting on amino acids and derivatives isomerase activity racemase and epimerase activity alanine racemase activity racemase and epimerase activity, acting on amino acids and derivatives amino-acid racemase activity identical protein binding protein binding L-cysteine desulfhydrase activity	homocysteine metabolic process serine family amino acid metabolic process oxoacid metabolic process sulfur amino acid metabolic process cellular metabolic process carboxylic acid metabolic process amino acid metabolic process primary metabolic process organic acid metabolic process transsulfuration alpha-amino acid metabolic process L-amino acid metabolic process cysteine metabolic process non-proteinogenic amino acid metabolic process proteinogenic amino acid metabolic process homocysteine metabolic process serine family amino acid metabolic process oxoacid metabolic process sulfur amino acid metabolic process cellular metabolic process carboxylic acid metabolic process amino acid metabolic process primary metabolic process organic acid metabolic process transsulfuration alpha-amino acid metabolic process L-amino acid metabolic process cysteine metabolic process non-proteinogenic amino acid metabolic process proteinogenic amino acid metabolic process metabolic process small molecule metabolic process cellular process sulfur compound metabolic process homoserine metabolic process cellular biosynthetic process aspartate family amino acid biosynthetic process aspartate family amino acid metabolic process organic acid biosynthetic process carboxylic acid biosynthetic process methionine biosynthetic process small molecule biosynthetic process L-amino acid biosynthetic process methionine metabolic process amino acid biosynthetic process sulfur compound biosynthetic process biosynthetic process proteinogenic amino acid biosynthetic process sulfur amino acid biosynthetic process alpha-amino acid biosynthetic process catabolic process L-cysteine catabolic process L-cysteine metabolic process organic acid catabolic process cellular catabolic process carboxylic acid catabolic process amino acid catabolic process pyruvate metabolic process L-amino acid catabolic process L-cysteine catabolic process to pyruvate serine family amino acid catabolic process sulfur compound catabolic process alpha-amino acid catabolic process proteinogenic amino acid catabolic process sulfur amino acid catabolic process cysteine catabolic process monocarboxylic acid metabolic process small molecule catabolic process protein-containing complex organization protein homotetramerization cellular component organization cellular component biogenesis cellular component assembly protein complex oligomerization protein tetramerization protein-containing complex assembly protein homooligomerization cellular component organization or biogenesis	intracellular anatomical structure cytoplasm cellular anatomical entity protein-containing complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR000277	Cys/Met metabolism, pyridoxal phosphate-dependent enzyme	Family
A, B	IPR015421	Pyridoxal phosphate-dependent transferase, major domain	Homologous Superfamily
A, B	IPR015422	Pyridoxal phosphate-dependent transferase, small domain	Homologous Superfamily
A, B	IPR015424	Pyridoxal phosphate-dependent transferase	Homologous Superfamily
A, B	IPR006233	Cystathionine beta-lyase, bacterial	Family

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
A, B	LLP	Parent Component: LYS RESID: AA0119 PSI-MOD : N6-pyridoxal phosphate-L-lysine MOD:00128

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

Chains	Enzyme Name	Description	Catalytic Residues
A	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 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 4.4.1.8 (PDB Primary Data) Search M-CSA Motif + EC 4.4.1.8 EC: 4.4.1.13 (UniProt) Search M-CSA Motif + EC 4.4.1.13 EC: 4.4.1.28 (UniProt) Search M-CSA Motif + EC 4.4.1.28

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.