This domain has been suggested to participate in carbohydrate metabolism [1]. Structural evidence indicates that it might be a carbohydrate binding domain, with or without enzymatic activity. In particular, it has been hypothesised that it might act as a glycoside hydrolase [1].

1: Structure of Bacteroides thetaiotaomicron BT2081 at 2.05 A resolution: the first structural representative of a new protein family that may play a role in carbohydrate metabolism. Yeh AP, Abdubek P, Astakhova T, Axelrod HL, Bakolitsa C, Cai X, Carlton D, Chen C, Chiu HJ, Chiu M, Clayton T, Das D, Deller MC, Duan L, Ellrott K, Farr CL, Feuerhelm J, Grant JC, Grzechnik A, Han GW, Jaroszewski L, Jin KK, Klock HE, Knuth MW, Kozbial P, Krishna SS, Kumar A, Lam WW, Marciano D, McMullan D, Miller MD, Morse AT, Nigoghossian E, Nopakun A, Okach L, Puckett C, Reyes R, Tien HJ, Trame CB, van den Bedem H, Weekes D, Wooten T, Xu Q, Hodgson KO, Wooley J, Elsliger MA, Deacon AM, Godzik A, Lesley SA, Wilson IA; Acta Crystallogr Sect F Struct Biol Cryst Commun. 2010;66:1287-1296. PMID:20944224