Alpha-glucuronidases, components of an ensemble of enzymes central to the recycling of photosynthetic biomass, remove the alpha-1,2 linked 4-O-methyl glucuronic acid from xylans. This family represents the C terminal region of alpha-glucuronidase which is mainly alpha-helical. It wraps around the catalytic domain (Pfam:PF07488), making additional interactions both with the N-terminal domain (Pfam:PF03648) of its parent monomer and also forming the majority of the dimer-surface with the equivalent C-terminal domain of the other monomer of the dimer [1].

1: The structural basis for catalysis and specificity of the Pseudomonas cellulosa alpha-glucuronidase, GlcA67A. Nurizzo D, Nagy T, Gilbert HJ, Davies GJ; Structure (Camb) 2002;10:547-556. PMID:11937059