Beta-galactosidase. This group of beta-galactosidase enzymes belong to the glycosyl hydrolase 42 family. The enzyme catalyzes the hydrolysis of terminal, non-reducing terminal beta-D-galactosidase residues.

Beta-galactosidase GanA [Carbohydrate transport and metabolism].

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 is involved in trimerisation.

A4 beta-galactosidase middle domain: a type 1 glutamine amidotransferase (GATase1)-like domain. A4 beta-galactosidase middle domain: a type 1 glutamine amidotransferase (GATase1)-like domain. This group includes proteins similar to beta-galactosidase from Thermus thermophilus. Beta-Galactosidase hydrolyzes the beta-1,4-D-galactosidic linkage of lactose, as well as those of related chromogens, o-nitrophenyl-beta-D-galactopyranoside (ONP-Gal) and 5-bromo-4-chloro-3-indolyl-beta-D-galactoside (X-gal). This A4 beta-galactosidase middle domain lacks the catalytic triad of typical GATase1 domains. The reactive Cys residue found in the sharp turn between a beta strand and an alpha helix termed the nucleophile elbow in typical GATase1 domains is not conserved in this group.

Catalytic domain of Helicobacter pylori peptidoglycan deacetylase (HpPgdA) and similar proteins. This family is represented by a peptidoglycan deacetylase (HP0310, HpPgdA) from the gram-negative pathogen Helicobacter pylori. HpPgdA has the ability to bind a metal ion at the active site and is responsible for a peptidoglycan modification that counteracts the host immune response. It functions as a homotetramer. The monomer is composed of a 7-stranded barrel with detectable sequence similarity to the 6-stranded barrel NodB homology domain of polysaccharide deacetylase (DCA)-like proteins in the CE4 superfamily, which removes N-linked or O-linked acetyl groups from cell wall polysaccharides. In contrast to typical NodB-like DCAs, HpPgdA does not exhibit a solvent-accessible polysaccharide binding groove, suggesting that the enzyme binds a small molecule at the active site.

GH42alpha-L-arabinopyranosidase from Bifidobacterium animalis subsp. lactis Bl-04 [Bifidobacterium animalis subsp. lactis],5XB7_B GH42 alpha-L-arabinopyranosidase from Bifidobacterium animalis subsp. lactis Bl-04 [Bifidobacterium animalis subsp. lactis],5XB7_C GH42 alpha-L-arabinopyranosidase from Bifidobacterium animalis subsp. lactis Bl-04 [Bifidobacterium animalis subsp. lactis],5XB7_D GH42 alpha-L-arabinopyranosidase from Bifidobacterium animalis subsp. lactis Bl-04 [Bifidobacterium animalis subsp. lactis],5XB7_E GH42 alpha-L-arabinopyranosidase from Bifidobacterium animalis subsp. lactis Bl-04 [Bifidobacterium animalis subsp. lactis],5XB7_F GH42 alpha-L-arabinopyranosidase from Bifidobacterium animalis subsp. lactis Bl-04 [Bifidobacterium animalis subsp. lactis]

Crystalstructure of Bifidobacterium bifidum beta-galactosidase in complex with alpha-galactose [Bifidobacterium bifidum S17],4UCF_B Crystal structure of Bifidobacterium bifidum beta-galactosidase in complex with alpha-galactose [Bifidobacterium bifidum S17],4UCF_C Crystal structure of Bifidobacterium bifidum beta-galactosidase in complex with alpha-galactose [Bifidobacterium bifidum S17],4UZS_A Crystal structure of Bifidobacterium bifidum beta-galactosidase [Bifidobacterium bifidum S17],4UZS_B Crystal structure of Bifidobacterium bifidum beta-galactosidase [Bifidobacterium bifidum S17],4UZS_C Crystal structure of Bifidobacterium bifidum beta-galactosidase [Bifidobacterium bifidum S17]

PolyextremophilicBeta-galactosidase from the Antarctic haloarchaeon Halorubrum lacusprofundi [Halorubrum lacusprofundi ATCC 49239]

3Dstructure of Gan42B, a GH42 beta-galactosidase from G. [Geobacillus stearothermophilus],4OIF_B 3D structure of Gan42B, a GH42 beta-galactosidase from G. [Geobacillus stearothermophilus],4OIF_C 3D structure of Gan42B, a GH42 beta-galactosidase from G. [Geobacillus stearothermophilus]

3Dstructure of the E323A catalytic mutant of Gan42B, a GH42 beta-galactosidase from G. stearothermophilus [Geobacillus stearothermophilus],4OJY_B 3D structure of the E323A catalytic mutant of Gan42B, a GH42 beta-galactosidase from G. stearothermophilus [Geobacillus stearothermophilus],4OJY_C 3D structure of the E323A catalytic mutant of Gan42B, a GH42 beta-galactosidase from G. stearothermophilus [Geobacillus stearothermophilus]

Beta-galactosidase BgaA OS=Clostridium cellulovorans (strain ATCC 35296 / DSM 3052 / OCM 3 / 743B) OX=573061 GN=bgaA PE=1 SV=1

Beta-galactosidase bgaB OS=Geobacillus kaustophilus OX=1462 GN=bgaB PE=1 SV=1

Beta-galactosidase BgaB OS=Geobacillus sp. (strain Y412MC61) OX=544556 GN=bgaB PE=3 SV=1

Beta-galactosidase Pbg OS=Clostridium perfringens (strain ATCC 13124 / DSM 756 / JCM 1290 / NCIMB 6125 / NCTC 8237 / Type A) OX=195103 GN=pbg PE=3 SV=1

Beta-galactosidase BbgII OS=Bifidobacterium bifidum OX=1681 GN=bbgII PE=3 SV=1