Enzymes which deacetylate the main component of plane cell wall hemicelluloses (xylan). Xylan is composed of a linear chain of beta(1-4)glycosidic-linked xylopyranoses, having various substitutions at carbon 2 and 3 positions (including acetyl groups). Biodegradation of xylan is a complex process catalysed by several fungal and bacterial enzymes. Although the linear chain is cleaved by endoxylanases and beta-xylosidases, acetylxylan esterases (AXE)1 hydrolyse O-acetyl substitutions of-xylopyranose moieties.
Defined by 5 residues: THR:A-13SER:A-90GLN:A-91ASP:A-175HIS:A-187