Glycoside Hydrolase Family 42

Activities in Familyβ-galactosidase (EC 3.2.1.23); α-L-arabinopyranosidase (EC 3.2.1.-)
Mechanism Retaining
ClanGH-A
3D Structure Status( β / α ) 8
Catalytic Nucleophile/BaseGlu (experimental)
Catalytic Proton DonorGlu (experimental)
NoteIdentification of the catalytic residues in doi:10.1016/j.febslet.2007.04.053
External resourcesCAZypedia;
Statistics GenBank accession (2361); Uniprot accession (355); PDB accession (16); 3D entries (9); cryst (1)
All (2302) Archaea (9) Bacteria (2287) Eukaryota (5) unclassified (1) Structure (9 - 1 cryst) Characterized (65)
Bacteria
Protein Name EC#OrganismGenBankUniprot
PDB/3D Carbohydrate Ligands Resolution (Å)
 β-galactosidase (Bcα-β-Gal) 3.2.1.23 Bacillus circulans subsp. alkalophilus    
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 (BgalII) 3.2.1.23 Bifidobacterium adolescentis DSM 20083 AAR24113.1 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 (Balac_0053) 3.2.1.- Bifidobacterium animalis subsp. lactis Bl-04 ACS45449.1 C6A5Q1
5XB7[A,B,C,D,E,F]
 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 (GanB;Gan42B) (intracellular) 3.2.1.23 Geobacillus stearothermophilus T-6 AEH26455.1  
4OIF[A,B,C] 2.45
4OJY[A,B,C] 2.50
5DFA[A,B,C] 2.50
 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  
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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