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.

Type 1 glutamine amidotransferase (GATase1)-like domain. Type 1 glutamine amidotransferase (GATase1)-like domain. This group contains proteins similar to Class I glutamine amidotransferases, the intracellular PH1704 from Pyrococcus horikoshii, the C-terminal of the large catalase: Escherichia coli HP-II, Sinorhizobium meliloti Rm1021 ThuA, the A4 beta-galactosidase middle domain and peptidase E. The majority of proteins in this group have a reactive Cys found in the sharp turn between a beta strand and an alpha helix termed the nucleophile elbow. For Class I glutamine amidotransferases proteins which transfer ammonia from the amide side chain of glutamine to an acceptor substrate, this Cys forms a Cys-His-Glu catalytic triad in the active site. Glutamine amidotransferases activity can be found in a range of biosynthetic enzymes included in this cd: glutamine amidotransferase, formylglycinamide ribonucleotide, GMP synthetase, anthranilate synthase component II, glutamine-dependent carbamoyl phosphate synthase (CPSase), cytidine triphosphate synthetase, gamma-glutamyl hydrolase, imidazole glycerol phosphate synthase and, cobyric acid synthase. For Pyrococcus horikoshii PH1704, the Cys of the nucleophile elbow together with a different His and, a Glu from an adjacent monomer form a catalytic triad different from the typical GATase1 triad. Peptidase E is believed to be a serine peptidase having a Ser-His-Glu catalytic triad which differs from the Cys-His-Glu catalytic triad of typical GATase1 domains, by having a Ser in place of the reactive Cys at the nucleophile elbow. The E. coli HP-II C-terminal domain, S. meliloti Rm1021 ThuA and the A4 beta-galactosidase middle domain lack the catalytic triad typical GATaseI domains. GATase1-like domains can occur either as single polypeptides, as in Class I glutamine amidotransferases, or as domains in a much larger multifunctional synthase protein, such as CPSase. Peptidase E has a circular permutation in the common core of a typical GTAse1 domain.

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]

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]

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]

3Dstructure of the E323A catalytic mutant of Gan42B, a GH42 beta-galactosidase from G. stearothermophilus [Geobacillus stearothermophilus],5DFA_B 3D structure of the E323A catalytic mutant of Gan42B, a GH42 beta-galactosidase from G. stearothermophilus [Geobacillus stearothermophilus],5DFA_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 LacZ OS=Lactobacillus acidophilus (strain ATCC 700396 / NCK56 / N2 / NCFM) OX=272621 GN=lacZ PE=1 SV=1

Beta-galactosidase LacA OS=Lactobacillus acidophilus OX=1579 GN=lacA PE=1 SV=1

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

Beta-galactosidase LacZ OS=Weizmannia coagulans OX=1398 GN=lacZ PE=3 SV=1