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We investigated the combined effect of ascorbate and copper [Asc/Cu(II)] on the integrity of bovine [Cu–Zn]-superoxide dismutase (bSOD1) as a model system to study the metal catalyzed oxidation (MCO) and fragmentation of proteins. We found Asc/Cu(II) mediates specific cleavage of bSOD1 and generates 12.5 and 3.2kDa fragments in addition to oxidation/carbonylation of the protein. The effect of other...
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