Glycosyl hydrolase family 26.

Beta-mannanase [Carbohydrate transport and metabolism].

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 Module 6 (CBM6); appended to glycoside hydrolase (GH) domains, including GH5 (cellulase). This family includes carbohydrate binding module 6 (CBM6) domains that are appended to several glycoside hydrolase (GH) domains, including GH5 (cellulase) and GH16, as well as to coagulation factor 5/8 carbohydrate-binding domains. CBM6s are non-catalytic carbohydrate binding domains that facilitate the strong binding of the GH catalytic modules with their dedicated, insoluble substrates. The CBM6s are appended to GHs that display a diversity of substrate specificities. For some members of this family information is available about the specific substrates of the appended GH domains. It includes the CBM domains of various enzymes involved in cell wall degradation including, an extracellular beta-1,3-glucanase from Lysobacter enzymogenes encoded by the gluC gene (its catalytic domain belongs to the GH16 family), the tandem CBM domains of Pseudomonas sp. PE2 beta-1,3(4)-glucanase A (its catalytic domain also belongs to GH16), and a family 6 CBM from Cellvibrio mixtus Endoglucanase 5A (CmCBM6) which binds to the beta1,4-beta1,3-mixed linked glucans lichenan, and barley beta-glucan, cello-oligosaccharides, insoluble forms of cellulose, the beta1,3-glucan laminarin, and xylooligosaccharides, and the CBM6 of Fibrobacter succinogenes S85 XynD xylanase, appended to a GH10 domain, and Cellvibrio japonicas Cel5G appended to a GH5 (cellulase) domain. GH5 (cellulase) family includes enzymes with several known activities such as endoglucanase, beta-mannanase, and xylanase, which are involved in the degradation of cellulose and xylans. GH16 family includes enzymes with lichenase, xyloglucan endotransglycosylase (XET), and beta-agarase activities. 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. For CmCBM6 it has been shown that these two binding sites have different ligand specificities.

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

Thestructure of BoMan26B, a GH26 beta-mannanase from Bacteroides ovatus [Bacteroides ovatus ATCC 8483],6HF4_A The structure of BoMan26B, a GH26 beta-mannanase from Bacteroides ovatus, complexed with G1M4 [Bacteroides ovatus ATCC 8483]

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]

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]

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 C OS=Piromyces sp. OX=45796 GN=MANC 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

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

Probable mannan endo-1,4-beta-mannosidase E OS=Emericella nidulans (strain FGSC A4 / ATCC 38163 / CBS 112.46 / NRRL 194 / M139) OX=227321 GN=manE PE=3 SV=1