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

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1qz9a_ Alpha and beta proteins (a/b) PLP-dependent transferase-like PLP-dependent transferases Cystathionine synthase-like Kynureninase (Pseudomonas fluorescens ) [TaxId: 294 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilyCystathionine synthase-like 8027726 4000672 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyPLP-dependent transferases 8040105 3000954 SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ABna5e1qz9A1 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: Bna5ECOD (1.6)
AAminotran_5_Ne1qz9A2 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

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.90.1150.10 Alpha Beta Alpha-Beta Complex Aspartate Aminotransferase, domain 1 Aspartate Aminotransferase, domain 1CATH (4.3.0)
A3.40.640.10 Alpha Beta 3-Layer(aba) Sandwich Aspartate Aminotransferase domain 2CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF01041DegT/DnrJ/EryC1/StrS aminotransferase family (DegT_DnrJ_EryC1)DegT/DnrJ/EryC1/StrS aminotransferase familyThe members of this family are probably all pyridoxal-phosphate-dependent aminotransferase enzymes with a variety of molecular functions. The family includes StsA Swiss:P72454, StsC Swiss:P77952 and StsS [1]. The aminotransferase activity was demons ...The members of this family are probably all pyridoxal-phosphate-dependent aminotransferase enzymes with a variety of molecular functions. The family includes StsA Swiss:P72454, StsC Swiss:P77952 and StsS [1]. The aminotransferase activity was demonstrated for purified StsC protein as the L-glutamine:scyllo-inosose aminotransferase EC:2.6.1.50, which catalyses the first amino transfer in the biosynthesis of the streptidine subunit of streptomycin [1].
Domain
PF22580Kynureninase C-terminal domain (KYNU_C)Kynureninase C-terminal domainThis entry represents de C-terminal domain of kynureninase [1-5], a member of a large family of catalytically diverse but structurally homologous pyridoxal 5'-phosphate (PLP) dependent enzymes. The Homo sapiens and other eukaryotic constitutive kynur ...This entry represents de C-terminal domain of kynureninase [1-5], a member of a large family of catalytically diverse but structurally homologous pyridoxal 5'-phosphate (PLP) dependent enzymes. The Homo sapiens and other eukaryotic constitutive kynureninases preferentially catalyse the hydrolytic cleavage of 3-hydroxy-l-kynurenine to produce 3-hydroxyanthranilate and l-alanine, while l-kynurenine is the substrate of many prokaryotic inducible kynureninases [1-5]..
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
KYNURENINASE

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

ChainsEnzyme NameDescriptionCatalytic Residues
kynureninase  M-CSA #742

Kynureninase is a pyridoxal-5'-phosphate (PLP)-dependent enzyme sourced from Pseudomonas fluorescens that catalyses the hydrolytic cleavage of L-kynurenine to anthranilic acid and L-alanine. This reaction is a key step in the catabolism of L-tryptophan. In fungi and vertebrates, kynurenine is first hydroxylated to 3-hydroxykynurenine - the preferred substrate of kynureninase in those organisms, resulting in 3-hydroxyanthranilate and L-alanine. Kynureninase also plays a role in the biosynthesis of NAD-(P)+. The product of kynureninase is subsequently converted by 3-hydroxyanthranilate-3,4-dioxygenase to quinolinic acid - a precursor of NAD-(P)+. Quinolinic acid is a neurotoxin due to it's agonist effects on N-methyl-D-aspartate receptor. Excessive levels of quinolinic acid have been implicated in a wide range of neurological disorders such as epilepsy, stroke and AIDS related dementia. Therefore, inhibitors of kynureninase are of interest as potential drugs for the treatment of these CNS disorders.

Defined by 5 residues: PHE:A-129ASP:A-201TYR:A-226LYS:A-227ARG:A-375
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