Xyloglucan
Structural polysaccharide in the primary cell walls of land plants / From Wikipedia, the free encyclopedia
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Xyloglucan is a hemicellulose that occurs in the primary cell wall of all vascular plants; however, all enzymes responsible for xyloglucan metabolism are found in Charophyceae algae.[1][2] In many dicotyledonous plants, it is the most abundant hemicellulose in the primary cell wall.[3] Xyloglucan binds to the surface of cellulose microfibrils and may link them together. It is the substrate of xyloglucan endotransglycosylase, which cuts and ligates xyloglucans, as a means of integrating new xyloglucans into the cell wall. It is also thought to be the substrate of alpha-expansin, which promotes cell wall enlargement.