This family, which contains bacterial and fungal glycoside hydrolases, is also known as GH125. They function as metal-independent alpha-mannosidases, with specificity for alpha-1,6-linked non-reducing terminal mannose residues[1]. Structurally this family is part of the 6 hairpin glycosidase superfamily.

1: Analysis of a new family of widely distributed metal-independent alpha-mannosidases provides unique insight into the processing of N-linked glycans. Gregg KJ, Zandberg WF, Hehemann JH, Whitworth GE, Deng L, Vocadlo DJ, Boraston AB; J Biol Chem. 2011;286:15586-15596. PMID:21388958