Annotations: 1KWK

Crystal structure of Thermus thermophilus A4 beta-galactosidase in complex with galactose

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1kwka1	All beta proteins	Glycosyl hydrolase domain	Glycosyl hydrolase domain	alpha-Amylases, C-terminal beta-sheet domain	A4 beta-galactosidase	(Thermus thermophilus ) [TaxId: 274 ],	SCOPe (2.08)
A	d1kwka2	Alpha and beta proteins (a/b)	TIM beta/alpha-barrel	(Trans)glycosidases	Amylase, catalytic domain	A4 beta-galactosidase	(Thermus thermophilus ) [TaxId: 274 ],	SCOPe (2.08)
A	d1kwka3	Alpha and beta proteins (a/b)	Flavodoxin-like	Class I glutamine amidotransferase-like	A4 beta-galactosidase middle domain	A4 beta-galactosidase middle domain	(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	SCOP2B Superfamily	Glycosyl hydrolase domain-like	8042836	3001528	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	(Trans)glycosidases	8042837	3000313	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Class I glutamine amidotransferase-like	8042838	3001405	SCOP2B (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	Ldl_recept_b	e1kwkA1	A: alpha arrays	X: Phage tail fiber protein trimerization domain	H: Phage tail fiber protein trimerization domain	T: Phage tail fiber protein trimerization domain	F: Ldl_recept_b	ECOD (v295.2)
A	NAD_binding_3	e1kwkA2	A: alpha arrays	X: C-terminal subdomain in Lon-related proteases catalytic domains	H: C-terminal subdomain in Lon-related proteases catalytic domains	T: C-terminal subdomain in Lon-related proteases catalytic domains	F: NAD_binding_3	ECOD (v295.2)
A	Abhydrolase_1	e1kwkA3	A: alpha arrays	X: C-terminal subdomain in Lon-related proteases catalytic domains	H: C-terminal subdomain in Lon-related proteases catalytic domains	T: C-terminal subdomain in Lon-related proteases catalytic domains	F: Abhydrolase_1	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.20.20.80	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Glycosidases	CATH (4.3.0)
A	3.40.50.880	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Class I glutamine amidotransferase (GATase) domain	CATH (4.3.0)
A	2.60.40.1180	Mainly Beta	Sandwich	Immunoglobulin-like	Golgi alpha-mannosidase II	CATH (4.3.0)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	BETA-GALACTOSIDASE	hydrolase activity, acting on glycosyl bonds beta-galactosidase activity hydrolase activity, hydrolyzing O-glycosyl compounds hydrolase activity catalytic activity galactosidase activity cation binding ion binding binding metal ion binding small molecule binding	monosaccharide metabolic process carbohydrate metabolic process hexose metabolic process small molecule metabolic process metabolic process cellular process primary metabolic process galactose metabolic process	protein-containing complex catalytic complex beta-galactosidase complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR029062	Class I glutamine amidotransferase-like	Homologous Superfamily
A	IPR013739	Beta-galactosidase C-terminal	Domain
A	IPR017853	Glycoside hydrolase superfamily	Homologous Superfamily
A	IPR003476	Glycoside hydrolase, family 42	Family
A	IPR013529	Glycoside hydrolase, family 42, N-terminal	Domain
A	IPR013780	Glycosyl hydrolase, all-beta	Homologous Superfamily
A	IPR013738	Beta-galactosidase trimerisation	Domain

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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 R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.