1QZ9

The Three Dimensional Structure of Kynureninase from Pseudomonas fluorescens

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Structure Motif: Primary M-CSA Annotation

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1qz9a_	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

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Cystathionine synthase-like	8027726	4000672	SCOP2 (2021-05-27)
A	SCOP2 Superfamily	PLP-dependent transferases	8040105	3000954	SCOP2 (2021-05-27)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF22580	e1qz9A1	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: PF22580	ECOD (1.6)
A	PF00266	e1qz9A2	A: a/b three-layered sandwiches	X: PLP-dependent transferases (From Topology)	H: PLP-dependent transferases (From Topology)	T: PLP-dependent transferases	F: PF00266	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

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

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01041	DegT/DnrJ/EryC1/StrS aminotransferase family (DegT_DnrJ_EryC1)	DegT/DnrJ/EryC1/StrS aminotransferase family	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 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
A	PF22580	Kynureninase C-terminal domain (KYNU_C)	Kynureninase C-terminal domain	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 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

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	KYNURENINASE	hydrolase activity, acting on acid carbon-carbon bonds hydrolase activity 3-hydroxykynureninase activity hydrolase activity, acting on acid carbon-carbon bonds, in ketonic substances catalytic activity vitamin binding vitamin B6 binding pyridoxal phosphate binding ion binding binding organic cyclic compound binding anion binding heterocyclic compound binding small molecule binding hydrolase activity, acting on acid carbon-carbon bonds hydrolase activity 3-hydroxykynureninase activity hydrolase activity, acting on acid carbon-carbon bonds, in ketonic substances catalytic activity vitamin binding vitamin B6 binding pyridoxal phosphate binding ion binding binding organic cyclic compound binding anion binding heterocyclic compound binding small molecule binding kynureninase activity	catabolic process oxoacid metabolic process aromatic amino acid family catabolic process indole-containing compound metabolic process amino acid metabolic process organic acid catabolic process organic acid metabolic process alpha-amino acid metabolic process cellular catabolic process non-proteinogenic amino acid metabolic process cellular ketone metabolic process carboxylic acid catabolic process indolalkylamine metabolic process small molecule metabolic process catabolic process oxoacid metabolic process aromatic amino acid family catabolic process indole-containing compound metabolic process amino acid metabolic process organic acid catabolic process organic acid metabolic process alpha-amino acid metabolic process cellular catabolic process non-proteinogenic amino acid metabolic process cellular ketone metabolic process carboxylic acid catabolic process indolalkylamine metabolic process small molecule metabolic process amino acid catabolic process organonitrogen compound catabolic process organonitrogen compound metabolic process aromatic amino acid metabolic process benzene-containing compound metabolic process cellular metabolic process carboxylic acid metabolic process primary metabolic process tryptophan metabolic process amine metabolic process kynurenine metabolic process tryptophan catabolic process to kynurenine alpha-amino acid catabolic process indole-containing compound catabolic process tryptophan catabolic process metabolic process cellular process small molecule catabolic process biogenic amine metabolic process quinolinate metabolic process small molecule biosynthetic process cellular biosynthetic process organonitrogen compound biosynthetic process dicarboxylic acid metabolic process pyridine-containing compound biosynthetic process organic acid biosynthetic process carboxylic acid biosynthetic process quinolinate biosynthetic process biosynthetic process pyridine-containing compound metabolic process dicarboxylic acid biosynthetic process anthranilate metabolic process monocarboxylic acid metabolic process L-kynurenine metabolic process ketone catabolic process L-kynurenine catabolic process non-proteinogenic amino acid catabolic process L-amino acid catabolic process L-amino acid metabolic process nucleotide biosynthetic process NAD metabolic process nucleobase-containing compound metabolic process purine nucleotide metabolic process nucleobase-containing small molecule metabolic process purine-containing compound biosynthetic process 'de novo' NAD biosynthetic process phosphate-containing compound metabolic process phosphorus metabolic process pyridine nucleotide metabolic process NAD biosynthetic process pyridine nucleotide biosynthetic process nucleoside phosphate metabolic process nicotinamide nucleotide metabolic process nucleotide metabolic process nucleobase-containing compound biosynthetic process purine-containing compound metabolic process nicotinamide nucleotide biosynthetic process organophosphate metabolic process organophosphate biosynthetic process nucleoside phosphate biosynthetic process 'de novo' NAD biosynthetic process from tryptophan purine nucleotide biosynthetic process	intracellular anatomical structure cytoplasm cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR015421	Pyridoxal phosphate-dependent transferase, major domain	Homologous Superfamily
A	IPR015422	Pyridoxal phosphate-dependent transferase, small domain	Homologous Superfamily
A	IPR010111	Kynureninase	Family
A	IPR015424	Pyridoxal phosphate-dependent transferase	Homologous Superfamily
A	IPR000192	Aminotransferase class V domain	Domain

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

Chains	Enzyme Name	Description	Catalytic Residues
A	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 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 3.7.1.3 (PDB Primary Data) Search M-CSA Motif + EC 3.7.1.3

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 R01GM133198.