Glycoside-hydrolase family GH114. This family is recognized as a glycosyl-hydrolase family, number 114. It is endo-alpha-1,4-polygalactosaminidase, a rare enzyme. It is proposed to be TIM-barrel, the most common structure amongst the catalytic domains of glycosyl-hydrolases.
extracellular protein. Original assignment of this protein family as cysteinyl-tRNA synthetase is controversial, supported by but challenged by and by subsequent discovery of the actual mechanism for synthesizing Cys-tRNA in species where a direct Cys--tRNA ligase was not found. Lingering legacy annotations of members of this family probably should be removed. Evidence against the role includes a signal peptide. This family as been renamed "extracellular protein" to facilitate correction. Members of this family occur in Deinococcus radiodurans (bacterial) and Methanococcus jannaschii (archaeal). A number of homologous but more distantly related proteins are annotated as alpha-1,4 polygalactosaminidases. The function remains unknown. [Unknown function, General]
Glycoside Hydrolase Family 66. Glycoside Hydrolase Family 66 contains proteins characterized as cycloisomaltooligosaccharide glucanotransferase (CITase) and dextranases from a variety of bacteria. CITase cyclizes part of a (1-6)-alpha-D-glucan (dextrans) chain by formation of a (1-6)-alpha-D-glucosidic bond. Dextranases catalyze the endohydrolysis of (1-6)-alpha-D-glucosidic linkages in dextran. Some members contain Carbohydrate Binding Module 35 (CBM35) domains, either C-terminal or inserted in the domain or both.