Annotations: 1KA9

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A [auth H]	d1ka9h_	Alpha and beta proteins (a/b)	Flavodoxin-like	Class I glutamine amidotransferase-like	Class I glutamine amidotransferases (GAT)	GAT subunit, HisH, (or domain) of imidazoleglycerolphosphate synthase HisF	(Thermus thermophilus ) [TaxId: 274 ],	SCOPe (2.08)
B [auth F]	d1ka9f_	Alpha and beta proteins (a/b)	TIM beta/alpha-barrel	Ribulose-phoshate binding barrel	Histidine biosynthesis enzymes	Cyclase subunit (or domain) of imidazoleglycerolphosphate synthase HisF	(Thermus thermophilus ) [TaxId: 274 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A [auth H]	SCOP2 Family	Class I glutamine amidotransferases (GAT)	8030352	4003747	SCOP2 (2022-06-29)
A [auth H]	SCOP2 Superfamily	Class I glutamine amidotransferase-like	8042731	3001405	SCOP2 (2022-06-29)
B [auth F]	SCOP2 Family	Histidine biosynthesis enzymes	8030350	4003056	SCOP2 (2022-06-29)
B [auth F]	SCOP2 Superfamily	Ribulose-phoshate binding barrel	8042729	3000216	SCOP2 (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 [auth H]	PF00117	e1ka9H1	A: a/b three-layered sandwiches	X: Flavodoxin-like	H: Class I glutamine amidotransferase-like	T: Class I glutamine amidotransferase-like	F: PF00117	ECOD (1.6)
B [auth F]	PF00977	e1ka9F1	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: PF00977	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A [auth H]	3.40.50.880	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Class I glutamine amidotransferase (GATase) domain	CATH (4.3.0)
B [auth F]	3.20.20.70	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Aldolase class I	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth H]	PF00117	Glutamine amidotransferase class-I (GATase)	Glutamine amidotransferase class-I	-	Domain
A [auth H]	PF07685	CobB/CobQ-like glutamine amidotransferase domain (GATase_3)	CobB/CobQ-like glutamine amidotransferase domain	-	Domain
B [auth F]	PF00977	Histidine biosynthesis protein (His_biosynth)	Histidine biosynthesis protein	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth H]	imidazole glycerol phosphate synthase	lyase activity catalytic activity hydrolase activity, acting on carbon-nitrogen (but not peptide) bonds, in linear amides glutaminase activity hydrolase activity hydrolase activity, acting on carbon-nitrogen (but not peptide) bonds imidazoleglycerol-phosphate synthase activity pentosyltransferase activity glycosyltransferase activity transferase activity	glutamine metabolic process organonitrogen compound metabolic process oxoacid metabolic process cellular metabolic process carboxylic acid metabolic process amino acid metabolic process primary metabolic process organic acid metabolic process alpha-amino acid metabolic process L-amino acid metabolic process glutamine family amino acid metabolic process proteinogenic amino acid metabolic process organic substance metabolic process metabolic process glutamine metabolic process organonitrogen compound metabolic process oxoacid metabolic process cellular metabolic process carboxylic acid metabolic process amino acid metabolic process primary metabolic process organic acid metabolic process alpha-amino acid metabolic process L-amino acid metabolic process glutamine family amino acid metabolic process proteinogenic amino acid metabolic process organic substance metabolic process metabolic process small molecule metabolic process cellular process small molecule biosynthetic process cellular biosynthetic process organonitrogen compound biosynthetic process organic acid biosynthetic process carboxylic acid biosynthetic process biosynthetic process organic substance biosynthetic process histidine metabolic process histidine biosynthetic process	intracellular anatomical structure cytoplasm cellular anatomical entity
B [auth F]	imidazole glycerol phosphate synthase	lyase activity catalytic activity imidazoleglycerol-phosphate synthase activity pentosyltransferase activity glycosyltransferase activity transferase activity	organonitrogen compound metabolic process small molecule biosynthetic process oxoacid metabolic process cellular biosynthetic process cellular metabolic process organonitrogen compound biosynthetic process carboxylic acid metabolic process organic acid biosynthetic process organic acid metabolic process carboxylic acid biosynthetic process organic substance metabolic process biosynthetic process organic substance biosynthetic process small molecule metabolic process organonitrogen compound metabolic process small molecule biosynthetic process oxoacid metabolic process cellular biosynthetic process cellular metabolic process organonitrogen compound biosynthetic process carboxylic acid metabolic process organic acid biosynthetic process organic acid metabolic process carboxylic acid biosynthetic process organic substance metabolic process biosynthetic process organic substance biosynthetic process small molecule metabolic process metabolic process cellular process histidine metabolic process histidine biosynthetic process	intracellular anatomical structure cytoplasm cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth H]	IPR029062	Class I glutamine amidotransferase-like	Homologous Superfamily
A [auth H]	IPR017926	Glutamine amidotransferase	Domain
A [auth H]	IPR010139	Imidazole glycerol phosphate synthase, subunit H	Family
B [auth F]	IPR011060	Ribulose-phosphate binding barrel	Homologous Superfamily
B [auth F]	IPR004651	Histidine biosynthesis, HisF	Family
B [auth F]	IPR013785	Aldolase-type TIM barrel	Homologous Superfamily
B [auth F]	IPR006062	Histidine biosynthesis protein	Family

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.