Mechanism	Retaining e
Clan	GH-A
3D Structure Status	( β / α ) 8 barrel
Catalytic Nucleophile/Base	Glu (experimental)
Catalytic Proton Donor	Glu (experimental)
Note	Identification of the catalytic residues in doi:10.1016/j.febslet.2007.04.053
External resources	CAZypedia;
Statistics	GenBank accession (12335); Uniprot accession (82); PDB accession (21); 3D entries (12); cryst (1)

Archaea
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D Carbohydrate Ligands Resolution (Å)
β-galactosidase (Bga; Hlac_2868)	3.2.1.23	Halorubrum lacusprofundi ATCC 49239	ACM58428.1	B9LW38	6LVW[A] 2.49
Bacteria
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D Carbohydrate Ligands Resolution (Å)
β-galactosidase (BgaB; BgalII)	3.2.1.23	Bifidobacterium adolescentis DSM 20083	AAR24113.1	A1A399 Q5J883	5VYM[A,B] 2.46
β-1,6/β-1,3-galactosidase (BlGal42A;Balac_0484) (Gal42A)	3.2.1.23	Bifidobacterium animalis subsp. lactis Bl-04	ACS45863.1	C6A6W5	4UNI[A,B,C] β-D-Galp 2.60 4UOQ[A,B,C] 2.70 4UOZ[A,B,C] α-D-Galp 2.30
α-L-arabinopyranosidase (BlArap42B; Balac_0053)	3.2.1.-	Bifidobacterium animalis subsp. lactis Bl-04	ACS45449.1	A0A2H4A2Z3 C6A5Q1	5XB7[A,B,C,D,E,F] 2.00
β-galactosidase (BbgII;LacZ2;BBIF_1313)	3.2.1.23	Bifidobacterium bifidum S17	ADO53518.1	E3EPA1	4UCF[A,B,C] α-D-Galp 1.94 4UZS[A,B,C] 1.74
β-galactosidase 42A (BiBga42A; BgaG; Blon_2016) (agarotriose-active) (Bga42A)	3.2.1.23	Bifidobacterium longum subsp. infantis ATCC 15697 = JCM 1222 = DSM 20088	ACJ53083.1 WP_012578289.1	B7GUD7 Q93GI5	8IBR[A] 1.70 8IBS[A,B,C,D,E,F] α-D-Galp 1.90 8IBT[A,B] β-D-Galp-(1-3)-β-D-GlcpNAc-(1-3)-β-D-Galp-(1-4)-β-D-Glcp 2.20
β-galactosidase 42B (GanB; Gan42B) (intracellular)	3.2.1.23	Geobacillus stearothermophilus T-6	AEH26455.1	F8TRX0	4OIF[A,B,C] 2.45 4OJY[A,B,C] 2.50 5DFA[A,B,C] 2.50
β-galactosidase (M-bGal)	3.2.1.23	Marinomonas sp. ef1	WP_100635792.1	A0A6P3CWF7	6Y2K[A] 1.90
β-galactosidase (Bcα-β-Gal)	3.2.1.23	Niallia circulans subsp. alkalophilus	QCG73672.1	A0A4D6T0U7	3TTS[B,C,D,E,F] 2.40 3TTY[A,B,C,D,E,F] α-D-Galp 2.25 3TTS[A] 2.40
β-galactosidase (BgaP)	3.2.1.23	Planococcus sp. L4	ABI64125.1	Q09HN2	cryst
β-galactosidase (R-β-Gal)	3.2.1.23	Rahnella sp. R3	AJC52391.1	A0A0B4U8I5	5E9A[A,B,C,D,E,F] 2.56
β-galactosidase (A4-β-Gal)	3.2.1.23	Thermus sp. A4	BAA28362.1	O69315	1KWG[A] 1.60 1KWK[A] α-D-Galp 2.20
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