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  • Title: [Functional groups involved in the nitrate reductase activity of milk xanthine oxidase].
    Author: Ananiadi LI, Sergeev NS, Kil'dibekov NA, L'vov NP, Kretovich VL.
    Journal: Biokhimiia; 1983 Jun; 48(6):932-6. PubMed ID: 6688366.
    Abstract:
    Milk xanthine oxidase possesses the nitrate reductase activity at pH 5.2; the pH optimum of the xanthine oxidase activity for the enzyme lies at 9.6. After removal of FAD and binding of Mo and Fe with a simultaneous measurement at the pH optima of the above activities it was found that only the Mo-containing site is necessary for the nitrate reductase activity. The switch-over of the enzyme from the xanthine oxidase to the nitrate reductase activity is associated with considerable conformational changes of the enzyme molecule.
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