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.

Type I dockerin repeat domain. Bacterial cohesin domains bind to a complementary protein domain named dockerin, and this interaction is required for the formation of the cellulosome, a cellulose-degrading complex. The cellulosome consists of scaffoldin, a noncatalytic scaffolding polypeptide, that comprises repeating cohesion modules and a single carbohydrate-binding module (CBM). Specific calcium-dependent interactions between cohesins and dockerins appear to be essential for cellulosome assembly. This subfamily represents type I dockerins, which are responsible for anchoring a variety of enzymatic domains to the complex.

Beta-mannanase [Carbohydrate transport and metabolism].

Dockerin type I repeat. The dockerin repeat is the binding partner of the cohesin domain pfam00963. The cohesin-dockerin interaction is the crucial interaction for complex formation in the cellulosome. The dockerin repeats, each bearing homology to the EF-hand calcium-binding loop bind calcium.

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

Crystalstructure of beta-mannanase from a symbiotic protist of the termite Reticulitermes speratus [Symbiotic protist of Reticulitermes speratus],3WDR_A Crystal structure of beta-mannanase from a symbiotic protist of the termite Reticulitermes speratus complexed with gluco-manno-oligosaccharide [Symbiotic protist of Reticulitermes speratus]

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]

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

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

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

Mannan endo-1,4-beta-mannosidase OS=Rhodothermus marinus (strain ATCC 43812 / DSM 4252 / R-10) OX=518766 GN=manA PE=1 SV=3