UDP-arabinopyranose mutase  UDP-arabinopyranose mutase (, "Os03g40270 protein", "UAM1", "UAM3", "RGP1", "RGP3", "OsUAM1", "OsUAM2", "Os07g41360 protein") is an enzyme with systematic name "UDP-arabinopyranose pyranomutase". This enzyme catalyses the following chemical reaction  The reaction is reversible.