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13C NMR analysis of methionine sulfoxide in protein
Journal of Biochemical and Biophysical Methods
|July 1, 1979
Abstract:
The 13C epsilon NMR signal of methionine sulfoxide is 22.6 ppm downfield from that of methionine. This affords a method by which the extent of methionine oxidation can be determined in intact protein. We demonstrate the utility of this approach with beta-galactosidase enriched with 13C in its methionine methyls.