This domain is found at the C-terminus of glycosyl hydrolase family 115 proteins [1]. This domain has a beta-sandwich fold [1].

1: Evidence that GH115 alpha-glucuronidase activity, which is required to degrade plant biomass, is dependent on conformational flexibility. Rogowski A, Basle A, Farinas CS, Solovyova A, Mortimer JC, Dupree P, Gilbert HJ, Bolam DN; J Biol Chem. 2014;289:53-64. PMID:24214982