A protein containing a flavin entity and at least one metal ion.
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Xanthine oxidase (XO, EC: is a complex metalloflavoprotein. This enzyme catalyzes the oxidation of hypoxanthine to xanthine and produces uric acid which leads to many diseases like gout and hyperuricemia [30].
XOR is a dimeric metalloflavoprotein comprising two identical subunits of approximately 145 kDa each, including one molybdenum-containing molybdopterin cofactor (Moco) and one flavin adenine dinucleotide (FAD) cofactor, as well as two nonidentical iron-sulfur redox centers.
The only justification may be the involvement of iron as a component of various flavoproteins (Metalloflavoproteins) active in biological oxidation (Devlin and Witham, 1983), which may increase as result of inoculation with the pathogen/ULCV (Ashfaq et al., 2010).