Glycoside hydrolase family 2 C-terminal domain 5. Domain 5 is found in dimeric beta-D-galactosidase from Paracoccus sp. 32d, which contributes to stabilization of the functional dimer. It is suggested that the location of this domain 5, may be one of the factors responsible for the creation of a functional dimer and cold-adaptation of this enzyme.

Carbohydrate Binding Module 6 (CBM6); many are appended to glycoside hydrolase (GH) family 11 and GH43 xylanase domains. This family includes carbohydrate binding module 6 (CBM6) domains that are appended mainly to glycoside hydrolase (GH) family domains, including GH3, GH11, and GH43 domains. These CBM6s are non-catalytic carbohydrate binding domains that facilitate the strong binding of the GH catalytic modules with their dedicated, insoluble substrates. Examples of proteins having CMB6s belonging to this family are Microbispora bispora GghA, a 1,4-beta-D-glucan glucohydrolase (GH3); Clostridium thermocellum xylanase U (GH11), and Penicillium purpurogenum ABF3, a bifunctional alpha-L-arabinofuranosidase/xylobiohydrolase (GH43). GH3 comprises enzymes with activities including beta-glucosidase (hydrolyzes beta-galactosidase) and beta-xylosidase (hydrolyzes 1,4-beta-D-xylosidase). GH11 family comprises enzymes with xylanase (endo-1,4-beta-xylanase) activity which catalyze the hydrolysis of beta-1,4 bonds of xylan, the major component of hemicelluloses, to generate xylooligosaccharides and xylose. GH43 includes beta-xylosidases and beta-xylanases, using aryl-glycosides as substrates. CBM6 is an unusual CBM as it represents a chimera of two distinct binding sites with different modes of binding: binding site I within the loop regions and binding site II on the concave face of the beta-sandwich fold.

Cellulose Binding Domain Type IV.

ChainA, Beta-galactosidase [Bifidobacterium bifidum],7NIT_B Chain B, Beta-galactosidase [Bifidobacterium bifidum],7NIT_C Chain C, Beta-galactosidase [Bifidobacterium bifidum],7NIT_D Chain D, Beta-galactosidase [Bifidobacterium bifidum],7NIT_E Chain E, Beta-galactosidase [Bifidobacterium bifidum],7NIT_F Chain F, Beta-galactosidase [Bifidobacterium bifidum]

Beta-galactosidase- construct 33-930 [Bifidobacterium bifidum],5DMY_B Beta-galactosidase - construct 33-930 [Bifidobacterium bifidum],5DMY_C Beta-galactosidase - construct 33-930 [Bifidobacterium bifidum]