Protein Structure
The protein is large, having a molecular weight of 270 kDa, and has 2 flavin molecules (bound as FAD), 2 molybdenum atoms, and 8 iron atoms bound per enzymatic unit. The molybdenum atoms are contained as molybdopterin cofactors and are the active sites of the enzyme. The iron atoms are part of ferredoxin iron-sulfur clusters and participate in electron transfer reactions.
Read more about this topic: Xanthine Oxidase
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—Donald Davidson (b. 1917)