catalytic activity:Hypoxanthine + NAD(+) + H(2)O = xanthine + NADH.,catalytic activity:Xanthine + H(2)O + O(2) = urate + H(2)O(2).,catalytic activity:Xanthine + NAD(+) + H(2)O = urate + NADH.,cofactor:Binds 2 2Fe-2S clusters.,cofactor:FAD.,cofactor:Molybdopterin.,disease:Defects in XDH are the cause of xanthinuria type 1 (XU1) [MIM:278300]. Xanthinuria is characterized by excretion of very large amounts of xanthine in the urine and a tendency to form xanthine stones. Uric acid is strikingly diminished in serum and urine. XU1 is due to isolated xanthine dehydrogenase. XU1 patients can metabolize allopurinol.,disease:May contribute to adult respiratory stress syndrome (ARDS) and may potentiate influenza infection through an oxygen metabolite-dependent mechanism.,function:This enzyme can be converted from the dehydrogenase form (D) to the oxidase form (O) irreversibly by proteolysis or reversibly through the oxidation of sulfhydryl groups.,similarity:Belongs to the xanthine dehydrogenase family.,similarity:Contains 1 2Fe-2S ferredoxin-type domain.,similarity:Contains 1 FAD-binding PCMH-type domain.,subunit:Homodimer. Interacts with BTN1A1.,
Cytoplasm . Peroxisome . Secreted.
Detected in milk (at protein level).