Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilyCystathionine synthase-like 8019990 4000672 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyPLP-dependent transferases 8032370 3000954 SCOP2 (2022-06-29)
BSCOP2B SuperfamilyPLP-dependent transferases 8032370 3000954 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AAminotran_3_C_1e1eluA1 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: Aminotran_3_C_1ECOD (1.6)
AAminotran_5_Ne1eluA2 A: a/b three-layered sandwichesX: PLP-dependent transferases (From Topology)H: PLP-dependent transferases (From Topology)T: PLP-dependent transferasesF: Aminotran_5_NECOD (1.6)
BAminotran_3_C_1e1eluB2 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: Aminotran_3_C_1ECOD (1.6)
BAminotran_5_Ne1eluB3 A: a/b three-layered sandwichesX: PLP-dependent transferases (From Topology)H: PLP-dependent transferases (From Topology)T: PLP-dependent transferasesF: Aminotran_5_NECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B
PF00266Aminotransferase class-V (Aminotran_5)Aminotransferase class-VThis domain is found in amino transferases, and other enzymes including cysteine desulphurase EC:4.4.1.-.Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B
L-CYSTEINE/L-CYSTINE C-S LYASE - -

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

ChainsEnzyme NameDescriptionCatalytic Residues
L-cysteine/cystine lyase  M-CSA #848

Cyst(e)ine C-S lyase (C-DES), isolated from Synechocystis sp. PCC 6714, is a pyridoxal 5'-phosphate (PLP)-dependent enzyme. It catalyses the conversion of cystine to cysteine persulfide, pyruvate and ammonia. The enzyme can also use cysteine, but to a lesser extent. C-DES is an important enzyme in sulfur mobilisation and Fe-S cluster assembly and directs FeS cluster insertion into Synechocystis apoferridoxin in vivo.

The observation of a persulfidic intermediate mimics the NifS PLP dependent L-Cysteine desulphurase, although C-DES is missing the largely conserved active site cysteine associated with NifS enzymes. The mechanism for C-DES persulphide formation offers an alternative pathway for the formation of S(0), although the mode of transport of the elemental sulfur has yet to be determined.

Defined by 6 residues: HIS:A-111 [auth A-114]ASP:A-194 [auth A-197]ALA:A-196 [auth A-199]GLN:A-197 [auth A-200]LYS:A-220 [auth A-223]ARG:A-357 [auth A-360]
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