Glucuronoyl esterase which may play a significant role in biomass degradation, as it is considered to disconnect hemicellulose from lignin through the hydrolysis of the ester bond between 4-O-methyl-D-glucuronic acid residues of glucuronoxylans and aromatic alcohols of lignin. Can hydrolyze benzyl glucuronic acid (BnGlcA), allyl glucuronic acid (allylGlcA) and to a lower degree methyl glucuronic acid (MeGlcA) in vitro. a 4-O-methyl-alpha-D-glucuronosyl ester derivative + H2O = 4-O-methyl-alpha-D-glucuronate derivative + an alcohol + H(+) Belongs to the carbohydrate esterase 15 (CE15) family.