Probable xylan acetyltransferase that plays a role in xylan acetylation and normal deposition of secondary cell walls (PubMed:26745802). Required for 2-O-monoacetylation, 3-O-monoacetylation and 2,3-O-diacetylation of xylosyl residues in xylan (PubMed:26745802). Required for the formation of 3-O-acetylated, 2-O-glucoronic acid-substituted xylosyl residues (PubMed:26745802). May act as a bridging protein that binds pectin and other cell wall polysaccharides. Probably involved in maintaining esterification of pectins (By similarity). Contains 2 motifs that are conserved in esterases, but it is unlikely that this protein belongs to the catalytically active pectin esterases. Belongs to the PC-esterase family. TBL subfamily.