Catalyzes the interconversion between UDP-glucose and UDP-galactose. UDP-alpha-D-glucose = UDP-alpha-D-galactose Enhanced activity by NaCl. Inhibited by UDP. Optimum pH is 7.0-9.0. Optimum temperature is 35 degrees Celsius. Carbohydrate metabolism; galactose metabolism. Forms homodimers and heterodimers. Widely expressed. No visible phenotype under normal growht conditions. Belongs to the NAD(P)-dependent epimerase/dehydratase family. Truncated N-terminus. Truncated N-terminus.