A Xyloglucan Backbone 6-O-Acetyltransferase from Brachypodium distachyon Modulates Xyloglucan Xylosylation

Dear Editor,Plant cells are surrounded and protected by cell walls, which consist primarily of polymers such as cellulose, hemicelluloses, pectic polysaccharides, and the polyphenol lignin. One of the ma- jor hemicelluloses in the primary cell wall is xyloglucan （XyG）, which consists of a β-1,4-glucan backbone containing xylosyl substituents. XyG attaches and partially covers the surface of cellulose microfibrils and is therefore thought to act as a spacer between microfibrils, reducing cellulose aggregation （Pauly et al., 2013）.