Figure 3

Substrates used to assay glucuronoyl esterase activity of BeCE15A: (a) benzyl glucuronoate, (b) allyl glucuronoate, (c) methyl glucuronoate, and (d) methyl galacturonoate. (e) The suggested target of the full-length BeCE15A-Rex8A enzyme, consists of a xylooligosaccharide (or longer xylan chain as indicated by the small arrow) decorated with GlcA, which is further ester-linked to lignin or lignin fragments.