Annotations: 1KWG

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1kwga1	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	d1kwga2	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	d1kwga3	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	SCOP2 Family	A4 beta-galactosidase middle domain	8030459	4002949	SCOP2 (2022-06-29)
A	SCOP2 Family	alpha-Amylases C-terminal beta-sheet domain	8030457	4002636	SCOP2 (2022-06-29)
A	SCOP2 Family	Amylase catalytic domain	8030458	4003138	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Class I glutamine amidotransferase-like	8042838	3001405	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Glycosyl hydrolase domain-like	8042836	3001528	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	(Trans)glycosidases	8042837	3000313	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	UNK_F_TYPE	e1kwgA1	A: beta sandwiches	X: Glycosyl hydrolase domain-like	H: Glycosyl hydrolase domain (From Topology)	T: Glycosyl hydrolase domain	F: UNK_F_TYPE	ECOD (1.6)
A	Glyco_hydro_42	e1kwgA2	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: Glyco_hydro_42	ECOD (1.6)
A	Glyco_hydro_42M	e1kwgA3	A: a/b three-layered sandwiches	X: Flavodoxin-like	H: Class I glutamine amidotransferase-like	T: Class I glutamine amidotransferase-like	F: Glyco_hydro_42M	ECOD (1.6)

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)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF02449	Beta-galactosidase (Glyco_hydro_42)	Beta-galactosidase	This group of beta-galactosidase enzymes belong to the glycosyl hydrolase 42 family. The enzyme catalyses the hydrolysis of terminal, non-reducing terminal beta-D-galactosidase residues.	Domain
A	PF08532	Beta-galactosidase trimerisation domain (Glyco_hydro_42M)	Beta-galactosidase trimerisation domain	This is non catalytic domain B of beta-galactosidase enzymes belong to the glycosyl hydrolase 42 family. This domain is related to glutamine amidotransferase enzymes, but the catalytic residues are replaced by non functional amino acids. This domain ...	This is non catalytic domain B of beta-galactosidase enzymes belong to the glycosyl hydrolase 42 family. This domain is related to glutamine amidotransferase enzymes, but the catalytic residues are replaced by non functional amino acids. This domain is involved in trimerisation [1].	Domain
A	PF08533	Beta-galactosidase C-terminal domain (Glyco_hydro_42C)	Beta-galactosidase C-terminal domain	This domain is found at the C-terminus of beta-galactosidase enzymes that belong to the glycosyl hydrolase 42 family [1].	Domain

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 organic substance metabolic process hexose metabolic process small molecule metabolic process metabolic 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

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.