Glycoside hydrolase family 44. This is a family of bacterial glycoside hydrolases formerly known as cellulase family J, and now known as Cel44A. It is one of the major enzymatic components of the cellulosome of Clostridium thermocellum strain F1 and of many other Firmicutes.

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.

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.

Dockerin repeat domain. Dockerins are modules in the cellulosome complex that often anchor catalytic subunits by binding to cohesin domains of scaffolding proteins. Three types of dockerins and their corresponding cohesin have been described in the literature. This alignment models two consecutive dockerin repeats, the functional unit.

Type II 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 II dockerins, which are responsible for mediating attachment of the cellulosome complex to the bacterial cell wall.

CrystalStructure of a Glycoside Hydrolase Family 44 Endoglucanase produced by Clostridium acetobutylium ATCC 824 [Clostridium acetobutylicum ATCC 824]

ChainA, Endoglucanase [Acetivibrio thermocellus],2E4T_A Chain A, Endoglucanase [Acetivibrio thermocellus],2EO7_A Chain A, Endoglucanase [Acetivibrio thermocellus]

ChainA, Endoglucanase [Acetivibrio thermocellus],2EJ1_A Chain A, Endoglucanase [Acetivibrio thermocellus],2EQD_A Chain A, Endoglucanase [Acetivibrio thermocellus]

Structureof a Paenibacillus polymyxa Xyloglucanase from GH family 44 with Xyloglucan [Paenibacillus polymyxa],2YJQ_A Structure of a Paenibacillus Polymyxa Xyloglucanase from Glycoside Hydrolase Family 44 [Paenibacillus polymyxa],2YJQ_B Structure of a Paenibacillus Polymyxa Xyloglucanase from Glycoside Hydrolase Family 44 [Paenibacillus polymyxa]

Structureof a Paenibacillus Polymyxa Xyloglucanase from Glycoside Hydrolase Family 44 [Paenibacillus polymyxa],3ZQ9_A Structure of a Paenibacillus Polymyxa Xyloglucanase from Glycoside Hydrolase Family 44 [Paenibacillus polymyxa]

Endoglucanase A OS=Paenibacillus lautus OX=1401 GN=celA PE=3 SV=1

Beta-mannanase/endoglucanase A OS=Caldicellulosiruptor saccharolyticus OX=44001 GN=manA PE=1 SV=2