Enables racemase and epimerase activity, acting on carbohydrates and derivatives. Involved in heparan sulfate proteoglycan biosynthetic process and heparin biosynthetic process. Located in Golgi apparatus. Is expressed in several structures, including alimentary system; central nervous system; eye; genitourinary system; and integumental system. Orthologous to human GLCE (glucuronic acid epimerase). [provided by Alliance of Genome Resources, Apr 2022]