Glycosyl hydrolase family 53. This domain belongs to family 53 of the glycosyl hydrolase classification. These enzymes are enzymes are endo-1,4- beta-galactanases (EC:3.2.1.89). The structure of this domain is known and has a TIM barrel fold.

Arabinogalactan endo-1,4-beta-galactosidase [Carbohydrate transport and metabolism].

Alpha amylase catalytic domain family. The Alpha-amylase family comprises the largest family of glycoside hydrolases (GH), with the majority of enzymes acting on starch, glycogen, and related oligo- and polysaccharides. These proteins catalyze the transformation of alpha-1,4 and alpha-1,6 glucosidic linkages with retention of the anomeric center. The protein is described as having 3 domains: A, B, C. A is a (beta/alpha) 8-barrel; B is a loop between the beta 3 strand and alpha 3 helix of A; and C is the C-terminal extension characterized by a Greek key. The majority of the enzymes have an active site cleft found between domains A and B where a triad of catalytic residues (Asp, Glu and Asp) performs catalysis. Other members of this family have lost this catalytic activity as in the case of the human 4F2hc, or only have 2 residues that serve as the catalytic nucleophile and the acid/base, such as Thermus A4 beta-galactosidase with 2 Glu residues (GH42) and human alpha-galactosidase with 2 Asp residues (GH31). The family members are quite extensive and include: alpha amylase, maltosyltransferase, cyclodextrin glycotransferase, maltogenic amylase, neopullulanase, isoamylase, 1,4-alpha-D-glucan maltotetrahydrolase, 4-alpha-glucotransferase, oligo-1,6-glucosidase, amylosucrase, sucrose phosphorylase, and amylomaltase.

Beta-1,4-galactanasefrom Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron VPI-5482],6GP5_B Beta-1,4-galactanase from Bacteroides thetaiotaomicron [Bacteroides thetaiotaomicron VPI-5482]

Beta-1,4-galactanasefrom Bacteroides thetaiotaomicron with galactose [Bacteroides thetaiotaomicron VPI-5482],6GPA_B Beta-1,4-galactanase from Bacteroides thetaiotaomicron with galactose [Bacteroides thetaiotaomicron VPI-5482]

ChainA, Arabinogalactan endo-1,4-beta-galactosidase [Ignisphaera aggregans DSM 17230],7OSK_B Chain B, Arabinogalactan endo-1,4-beta-galactosidase [Ignisphaera aggregans DSM 17230]

Thestructure of endo-beta-1,4-galactanase from Bacillus licheniformis [Bacillus licheniformis],1R8L_B The structure of endo-beta-1,4-galactanase from Bacillus licheniformis [Bacillus licheniformis],1UR0_A The structure of endo-beta-1,4-galactanase from Bacillus licheniformis in complex with two oligosaccharide products. [Bacillus licheniformis],1UR0_B The structure of endo-beta-1,4-galactanase from Bacillus licheniformis in complex with two oligosaccharide products. [Bacillus licheniformis],1UR4_A The structure of endo-beta-1,4-galactanase from Bacillus licheniformis in complex with two oligosaccharide products. [Bacillus licheniformis],1UR4_B The structure of endo-beta-1,4-galactanase from Bacillus licheniformis in complex with two oligosaccharide products. [Bacillus licheniformis],2CCR_A Structure of Beta-1,4-Galactanase [Bacillus licheniformis],2CCR_B Structure of Beta-1,4-Galactanase [Bacillus licheniformis],2J74_A Structure of Beta-1,4-Galactanase [Bacillus licheniformis],2J74_B Structure of Beta-1,4-Galactanase [Bacillus licheniformis]

ChainA, Glycosyl Hydrolase Family 53 [Bacillus licheniformis],2GFT_B Chain B, Glycosyl Hydrolase Family 53 [Bacillus licheniformis]

Uncharacterized protein in bgaB 5'region (Fragment) OS=Niallia circulans OX=1397 PE=3 SV=1

Endo-beta-1,4-galactanase OS=Bacillus licheniformis (strain ATCC 14580 / DSM 13 / JCM 2505 / CCUG 7422 / NBRC 12200 / NCIMB 9375 / NCTC 10341 / NRRL NRS-1264 / Gibson 46) OX=279010 GN=ganB PE=1 SV=1

Probable arabinogalactan endo-beta-1,4-galactanase A OS=Neosartorya fischeri (strain ATCC 1020 / DSM 3700 / CBS 544.65 / FGSC A1164 / JCM 1740 / NRRL 181 / WB 181) OX=331117 GN=galA PE=3 SV=1

Endo-beta-1,4-galactanase OS=Bacillus subtilis (strain 168) OX=224308 GN=ganB PE=1 SV=1

Arabinogalactan endo-beta-1,4-galactanase OS=Thermothelomyces thermophilus OX=78579 PE=1 SV=1