Probable UDP-L-arabinose mutase involved in the biosynthesis of cell wall non-cellulosic polysaccharides. UDP-beta-L-arabinofuranose = UDP-beta-L-arabinopyranose Homopentamer or homohexamer. Cell wall-associated, with highest concentrations on plasmodesmata. Also located in the Golgi apparatus (By similarity). Causes an allergic reaction in human. Binds to IgE. On the 2D-gel the determined pI of this protein is: 6.24, its MW is: 20 kDa. Belongs to the RGP family.