Glycosyl hydrolases family 11.

Carbohydrate Binding Module family 36 (CBM36); appended mainly to glycoside hydrolase family 11 (GH11) domains; xylan binding. This family includes carbohydrate binding module family 36 (CBM36) most of which appear appended to glycoside hydrolase family 11 (GH11) domains. These CBMs are non-catalytic carbohydrate binding domains that facilitate the strong binding of the GH11 catalytic modules with their dedicated, insoluble substrates. GH11 domains have xylanase (endo-1,4-beta-xylanase) activity which catalyzes the hydrolysis of beta-1,4 bonds of xylan, the major component of hemicelluloses, to generate xylooligosaccharides and xylose. This family includes XynB from Dictyoglomus thermophilum Rt46B.1 and Xyn11A from Pseudobutyrivibrio xylanivorans Mz5T. Xyn11A is a multicatalytic enzyme with an N-terminal GH11 domain, a CBM36 domain, and a C-terminal putative NodB-like polysaccharide deacetylase which is predicted to be an acetyl esterase involved in debranching activity in the xylan backbone. 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. Consistent with its structural and sequence similarity to CBM6, CBM36 binds xylan, but only at binding site I, and in a calcium-dependent manner; the latter suggests its potential application in affinity labeling.

Carbohydrate binding module (family 6).

Structureof a GH11 domain refined from the X-ray diffraction data of a GH11-CBM36-1 crystal. [uncultured bacterium]

Atwo-domain structure of alkaliphilic XynJ from Bacillus sp. 41M-1 [Bacillus sp. 41M-1],2DCJ_B A two-domain structure of alkaliphilic XynJ from Bacillus sp. 41M-1 [Bacillus sp. 41M-1],2DCK_A A tetragonal-lattice structure of alkaliphilic XynJ from Bacillus sp. 41M-1 [Bacillus sp. 41M-1]

XylanaseJ mutant from Bacillus sp. 41M-1 [Bacillus sp. 41M-1],6KKA_B Xylanase J mutant from Bacillus sp. 41M-1 [Bacillus sp. 41M-1]

XylanaseJ from Bacillus sp. strain 41M-1 [Bacillus sp. 41M-1],6KJL_B Xylanase J from Bacillus sp. strain 41M-1 [Bacillus sp. 41M-1]

Crystalstructure of the GH11 domain of a multidomain xylanase from the hindgut metagenome of Trinervitermes trinervoides [uncultured bacterium],7AYL_B Crystal structure of the GH11 domain of a multidomain xylanase from the hindgut metagenome of Trinervitermes trinervoides [uncultured bacterium]

Bifunctional xylanase/deacetylase OS=Pseudobutyrivibrio xylanivorans OX=185007 GN=xyn11A PE=1 SV=2

Endo-1,4-beta-xylanase A OS=Thermoclostridium stercorarium OX=1510 GN=xynA PE=1 SV=2

Endo-1,4-beta-xylanase OS=Clostridium saccharobutylicum OX=169679 GN=xynB PE=3 SV=1

Endo-1,4-beta-xylanase A OS=Thermoclostridium stercorarium OX=1510 GN=xynA PE=1 SV=2

Endo-1,4-beta-xylanase A OS=Bacillus pumilus OX=1408 GN=xynA PE=1 SV=2