Glycosyl hydrolase family 26.

Carbohydrate Binding Module 35 (CBM35); appended to several carbohydrate binding enzymes, including several glycoside hydrolase (GH) family 26 mannanase domains. This family includes carbohydrate binding module 35 (CBM35) domains that are appended to several carbohydrate binding enzymes, including periplasmic component of ABC-type sugar transport system involved in carbohydrate transport and metabolism, and several glycoside hydrolase (GH) domains, including GH26. 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 CMB35s belonging to this family are mannanase A from Clostridium thermocellum (GH26), Man26B from Paenibacillus sp. BME-14 (GH26), and the multifunctional Cel44C-Man26A from Paenibacillus polymyxa GS01 (which has two GH domains, GH44 and GH26). GH26 mainly includes mannan endo-1,4-beta-mannosidase which hydrolyzes 1,4-beta-D-linkages in mannans, galacto-mannans, glucomannans, and galactoglucomannans, but displays little activity towards other plant cell wall polysaccharides. A few proteins belonging to this family have additional CBM3 domains; these CBM3s are not found in the CBM6-CBM35-CBM36_like superfamily.

Carbohydrate binding domain X2. This domain binds to cellulose and to bacterial cell walls. It is found in glycosyl hydrolases and in scaffolding proteins of cellulosomes (multiprotein glycosyl hydrolase complexes). In the cellulosome it may aid cellulose degradation by anchoring the cellulosome to the bacterial cell wall and by binding it to its substrate. This domain has an Ig-like fold.

Carbohydrate binding domain X2. This domain binds to cellulose and to bacterial cell walls. It is found in glycosyl hydrolases and in scaffolding proteins of cellulosomes (multiprotein glycosyl hydrolase complexes). In the cellulosome it may aid cellulose degradation by anchoring the cellulosome to the bacterial cell wall and by binding it to its substrate. This domain has an Ig-like fold.

Cellulose binding domain.

ChainA, Gh26 Endo-beta-1,4-mannanase [Podospora anserina S mat+]

ChainA, CELLULOSOMAL SCAFFOLDIN [Acetivibrio cellulolyticus],3ZU8_A Chain A, Cellulosomal Scaffoldin [Acetivibrio cellulolyticus],3ZUC_A Chain A, CELLULOSOMAL SCAFFOLDIN [Acetivibrio cellulolyticus]

Crystalstructure of the GH26 domain from PbGH26-GH5A endo-beta-mannanase/endo-beta-glucanase from Prevotella bryantii [Prevotella bryantii B14]

Crystalstructure of Prevotella bryantii endo-beta-mannanase/endo-beta-glucanase PbGH26A-GH5A [Prevotella bryantii B14],6D2W_B Crystal structure of Prevotella bryantii endo-beta-mannanase/endo-beta-glucanase PbGH26A-GH5A [Prevotella bryantii B14]

Structureof Inactive E165Q mutant of fungal non-CBM carrying GH26 endo-b-mannanase from Yunnania penicillata in complex with alpha-62-61-di-galactosyl-mannotriose [Yunnania penicillata]

Endoglucanase Z OS=Thermoclostridium stercorarium OX=1510 GN=celZ PE=1 SV=1

Xyloglucanase OS=Paenibacillus sp. OX=58172 GN=xeg74 PE=1 SV=1

Exoglucanase-2 OS=Thermoclostridium stercorarium (strain ATCC 35414 / DSM 8532 / NCIMB 11754) OX=1121335 GN=celY PE=1 SV=2

Mannan endo-1,4-beta-mannosidase OS=Myceliophthora thermophila (strain ATCC 42464 / BCRC 31852 / DSM 1799) OX=573729 GN=Man26A PE=1 SV=1

Mannan endo-1,4-beta-mannosidase B OS=Piromyces sp. OX=45796 GN=MANB PE=2 SV=1