Catalyzes the dephosphorylation and oxidation of UMP to generate 5'-dehydrouridine, the first intermediate in the biosynthesis of the liposidomycin-like A-90289 antibiotic. 2-oxoglutarate + O2 + UMP = CO2 + phosphate + succinate + uridine-5'-aldehyde Inhibited by several divalent cations, including Zn(2+). kcat is 92 min(-1) with 2-oxoglutarate as substrate. kcat is 76 min(-1) with UMP as substrate.