Annotations: 3OBA

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	FeoB_Cyto	e3obaA5	A: a/b three-layered sandwiches	X: Lipocalins/Streptavidin	H: Zn-dependent exopeptidases	T: Zn-dependent exopeptidases	F: FeoB_Cyto	ECOD (v294.1)
A	Ig_2	e3obaA6	A: a/b three-layered sandwiches	X: Subtilisin-like	H: Subtilisin-like	T: Subtilisin-like	F: Ig_2	ECOD (v294.1)
B [auth C]	FeoB_Cyto	e3obaC5	A: a/b three-layered sandwiches	X: Lipocalins/Streptavidin	H: Zn-dependent exopeptidases	T: Zn-dependent exopeptidases	F: FeoB_Cyto	ECOD (v294.1)
B [auth C]	Ig_2	e3obaC6	A: a/b three-layered sandwiches	X: Subtilisin-like	H: Subtilisin-like	T: Subtilisin-like	F: Ig_2	ECOD (v294.1)
D [auth B]	FeoB_Cyto	e3obaB5	A: a/b three-layered sandwiches	X: Lipocalins/Streptavidin	H: Zn-dependent exopeptidases	T: Zn-dependent exopeptidases	F: FeoB_Cyto	ECOD (v294.1)
D [auth B]	Ig_2	e3obaB6	A: a/b three-layered sandwiches	X: Subtilisin-like	H: Subtilisin-like	T: Subtilisin-like	F: Ig_2	ECOD (v294.1)
C [auth D]	FeoB_Cyto	e3obaD5	A: a/b three-layered sandwiches	X: Lipocalins/Streptavidin	H: Zn-dependent exopeptidases	T: Zn-dependent exopeptidases	F: FeoB_Cyto	ECOD (v294.1)
C [auth D]	Ig_2	e3obaD6	A: a/b three-layered sandwiches	X: Subtilisin-like	H: Subtilisin-like	T: Subtilisin-like	F: Ig_2	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.60.120.260	Mainly Beta	Sandwich	Jelly Rolls	Galactose-binding domain-like	CATH (4.3.0)
A	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
A	3.20.20.80	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Glycosidases	CATH (4.3.0)
A	2.70.98.10	Mainly Beta	Distorted Sandwich	Beta-galactosidase	Chain A, domain 5	CATH (4.3.0)
B [auth C]	2.60.120.260	Mainly Beta	Sandwich	Jelly Rolls	Galactose-binding domain-like	CATH (4.3.0)
B [auth C]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B [auth C]	3.20.20.80	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Glycosidases	CATH (4.3.0)
B [auth C]	2.70.98.10	Mainly Beta	Distorted Sandwich	Beta-galactosidase	Chain A, domain 5	CATH (4.3.0)
D [auth B]	2.60.120.260	Mainly Beta	Sandwich	Jelly Rolls	Galactose-binding domain-like	CATH (4.3.0)
D [auth B]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
D [auth B]	3.20.20.80	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Glycosidases	CATH (4.3.0)
D [auth B]	2.70.98.10	Mainly Beta	Distorted Sandwich	Beta-galactosidase	Chain A, domain 5	CATH (4.3.0)
C [auth D]	2.60.120.260	Mainly Beta	Sandwich	Jelly Rolls	Galactose-binding domain-like	CATH (4.3.0)
C [auth D]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C [auth D]	3.20.20.80	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Glycosidases	CATH (4.3.0)
C [auth D]	2.70.98.10	Mainly Beta	Distorted Sandwich	Beta-galactosidase	Chain A, domain 5	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B [auth C], C [auth D], D [auth B]	PF02836	Glycosyl hydrolases family 2, TIM barrel domain (Glyco_hydro_2_C)	Glycosyl hydrolases family 2, TIM barrel domain	This family contains beta-galactosidase, beta-mannosidase and beta-glucuronidase activities.	Domain
A, B [auth C], C [auth D], D [auth B]	PF00703	Glycosyl hydrolases family 2 (Glyco_hydro_2)	Glycosyl hydrolases family 2	This family contains beta-galactosidase, beta-mannosidase and beta-glucuronidase activities.	Domain
A, B [auth C], C [auth D], D [auth B]	PF02837	Glycosyl hydrolases family 2, sugar binding domain (Glyco_hydro_2_N)	Glycosyl hydrolases family 2, sugar binding domain	This family contains beta-galactosidase, beta-mannosidase and beta-glucuronidase activities and has a jelly-roll fold. The domain binds the sugar moiety during the sugar-hydrolysis reaction.	Domain
A, B [auth C], C [auth D], D [auth B]	PF16353	Beta-galactosidase, domain 4 (LacZ_4)	Beta-galactosidase, domain 4	This entry represents domain 4 found in beta-galactosidase [1] and it is organised in a jelly-roll type barrel (Rutkiewicz-Krotewicz M. et al. Crystals 2018, 8(1), 13, https://doi.org/10.3390/cryst8010013).	Domain
A, B [auth C], C [auth D], D [auth B]	PF02929	Beta galactosidase small chain (Bgal_small_N)	Beta galactosidase small chain	This domain comprises the small chain of dimeric beta-galactosidases EC:3.2.1.23. This domain is also found in single chain beta-galactosidase.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B [auth C], C [auth D], D [auth B]	Beta-galactosidase	binding carbohydrate binding hydrolase activity, acting on glycosyl bonds beta-galactosidase activity hydrolase activity, hydrolyzing O-glycosyl compounds hydrolase activity catalytic activity galactosidase activity	carbohydrate metabolic process catabolic process oligosaccharide catabolic process oligosaccharide metabolic process lactose catabolic process carbohydrate catabolic process primary metabolic process disaccharide metabolic process lactose metabolic process metabolic process cellular process disaccharide catabolic process	protein-containing complex catalytic complex beta-galactosidase complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B [auth C], C [auth D], D [auth B]	IPR006102	Glycoside hydrolase family 2, immunoglobulin-like beta-sandwich	Domain
A, B [auth C], C [auth D], D [auth B]	IPR032312	Beta-galactosidase, domain 4	Domain
A, B [auth C], C [auth D], D [auth B]	IPR017853	Glycoside hydrolase superfamily	Homologous Superfamily
A, B [auth C], C [auth D], D [auth B]	IPR006101	Glycoside hydrolase, family 2	Family
A, B [auth C], C [auth D], D [auth B]	IPR004199	Beta galactosidase small chain/ domain 5	Domain
A, B [auth C], C [auth D], D [auth B]	IPR008979	Galactose-binding-like domain superfamily	Homologous Superfamily
A, B [auth C], C [auth D], D [auth B]	IPR036156	Beta-Galactosidase/glucuronidase domain superfamily	Homologous Superfamily
A, B [auth C], C [auth D], D [auth B]	IPR006104	Glycosyl hydrolases family 2, sugar binding domain	Domain
A, B [auth C], C [auth D], D [auth B]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A, B [auth C], C [auth D], D [auth B]	IPR006103	Glycoside hydrolase family 2, catalytic domain	Domain
A, B [auth C], C [auth D], D [auth B]	IPR023232	Glycoside hydrolase, family 2, active site	Active Site
A, B [auth C], C [auth D], D [auth B]	IPR023230	Glycoside hydrolase, family 2, conserved site	Conserved Site
A, B [auth C], C [auth D], D [auth B]	IPR014718	Glycoside hydrolase-type carbohydrate-binding	Homologous Superfamily
A, B [auth C], C [auth D], D [auth B]	IPR050347	Bacterial Beta-galactosidase	Family
A, B [auth C], C [auth D], D [auth B]	IPR011013	Galactose mutarotase-like domain superfamily	Homologous Superfamily

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.