This family consists of uncharacterised proteins around 200 residues in length and is mainly found in various Bacteroides and Capnocytophaga species. The function of this family is unknown. Distant homology analysis suggests a possible similarity of proteins from this family to TIM barrel glycoside hydrolases and, subsequently its involvement in carbohydrate metabolism.The domain lies downstream of glycosyl hydrolases 42 suggesting that as a domain it might represent the carbohydrate-binding region of the enzyme.