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Determination of methionine sulfoxide in proteins: comparison of a gas-chromatographic and electrophoretic method

Authors
Journal
Journal of Biochemical and Biophysical Methods
0165-022X
Publisher
Elsevier
Publication Date
Volume
11
Identifiers
DOI: 10.1016/0165-022x(85)90006-5
Keywords
  • Protein Oxidation
  • Methionine Sulfoxide
  • Methyl Thiocyanate
  • Gas Chromatography
  • Sds-Page
Disciplines
  • Biology

Abstract

Abstract Two methods for the determination of methionine in proteins have been used to estimate the extent of methionine sulfoxide obtained upon exposure of proteins to oxidizing agents. Both methods are bases on prior treatment with cyanogen bromide, which attacks methionines (but not the sulfoxide derivative) with the resultant formation of methyl thiocyanate and peptides. The amount of methyl thiocyanate is determined quantitatively by gas chromatography, while the number of peptides is ascertained by SDS-polyacrylamide gel electrophoresis. The gas chromatographic estimate of CH 3SCN offers an accurate and precise method (down to nanogram values) for the quantitative determination of methionine sulfoxide in proteins. Due to its simplicity and the use of low-cost equipment, the electrophoretic method appears to be a valuable complement to the gas chromatographic method, and the two methods in conjunction provide novel results.

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