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.

Cyclo-malto-dextrinase C-terminal domain. This domain is at the very C-terminus of cyclo-malto-dextrinase proteins and consists of 8 beta strands, is largely globular and appears to help stabilize the acitve sites created by upstream domains, Cyc-maltodext_N pfam09087, and Alpha-amylase pfam00128. Cyclo-malto-dextrinases hydrolyze cyclodextrans to maltose and glucose and catalyze trans-glycosylation of oligosaccharides to the C3-, C4- or C6-hydroxyl groups of various acceptor sugar molecules.

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]

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

ChainA, Beta-galactosidase [Niallia circulans subsp. alkalophilus],3TTS_B Chain B, Beta-galactosidase [Niallia circulans subsp. alkalophilus],3TTS_C Chain C, Beta-galactosidase [Niallia circulans subsp. alkalophilus],3TTS_D Chain D, Beta-galactosidase [Niallia circulans subsp. alkalophilus],3TTS_E Chain E, Beta-galactosidase [Niallia circulans subsp. alkalophilus],3TTS_F Chain F, Beta-galactosidase [Niallia circulans subsp. alkalophilus],3TTY_A Chain A, Beta-galactosidase [Niallia circulans subsp. alkalophilus],3TTY_B Chain B, Beta-galactosidase [Niallia circulans subsp. alkalophilus],3TTY_C Chain C, Beta-galactosidase [Niallia circulans subsp. alkalophilus],3TTY_D Chain D, Beta-galactosidase [Niallia circulans subsp. alkalophilus],3TTY_E Chain E, Beta-galactosidase [Niallia circulans subsp. alkalophilus],3TTY_F Chain F, Beta-galactosidase [Niallia circulans subsp. alkalophilus]

ChainA, beta-galactosidase [Marinomonas sp. ef1]

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]

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 BgaH OS=Haloferax lucentense (strain DSM 14919 / JCM 9276 / NCIMB 13854 / Aa 2.2) OX=1230452 GN=bgaH PE=1 SV=2

Beta-galactosidase Bga OS=Halorubrum lacusprofundi (strain ATCC 49239 / DSM 5036 / JCM 8891 / ACAM 34) OX=416348 GN=Hlac_2868 PE=1 SV=1