Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyTryptophan synthase beta subunit-like PLP-dependent enzymes 8032992 3001427 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyTryptophan synthase beta subunit-like PLP-dependent enzymes 8032992 3001427 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
APALPe1oasA2 A: a/b three-layered sandwichesX: Rossmann-likeH: Tryptophan synthase beta subunit-like PLP-dependent enzymes (From Topology)T: Tryptophan synthase beta subunit-like PLP-dependent enzymesF: PALPECOD (1.6)
BPALPe1oasB2 A: a/b three-layered sandwichesX: Rossmann-likeH: Tryptophan synthase beta subunit-like PLP-dependent enzymes (From Topology)T: Tryptophan synthase beta subunit-like PLP-dependent enzymesF: PALPECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.40.50.1100 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold CATH (4.3.0)
B3.40.50.1100 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B
PF00291Pyridoxal-phosphate dependent enzyme (PALP)Pyridoxal-phosphate dependent enzyme- Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B
O-ACETYLSERINE SULFHYDRYLASE

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

ChainsEnzyme NameDescriptionCatalytic Residues
cysteine synthase  M-CSA #865

O-Acetylserine sulfhydrylase (cystenie synthase, OASS) is a pyridoxal 5′-phosphate (PLP)-dependent enzyme that catalyses the conversion of O-acetylserine and bisulfide to L-cysteine and acetate in bacteria and higher plants. Enteric bacteria have two isozymes of OASS, A and B, produced under aerobic and anaerobic growth conditions, respectively, with different substrate specificity. This entry represents CysK (the A isoenzyme), which can use sulphide instead of thiosulphate, to produce cysteine instead of cysteine thiosulphonate.

Defined by 2 residues: LYS:A-41SER:A-272
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