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Plant Physiology 100:529-532 (1992) © 1992 American Society of Plant Biologists A New Method of Measuring Protein-Methionine-S-Oxide Reductase Activity 1U.S. Department of Agriculture, Route 3, Box 215, Lubbock, Texas 79401, Plant Stress and Water Conservation Research Unit, Route 3, Box 215, Lubbock, Texas 79401
A new assay for measuring protein-methionine-S-oxide reductase is reported. The assay measures the conversion of N-(9-fluorenylmethoxycarbonyl)-methionine sulfoxide to N-(9-fluorenylmethoxycarbonyl)-methionine using fluorescence detection after high-performance liquid chromatography separation. Enzyme activity is linear over a 60-min period and the assay is sensitive enough to detect the consumption of only 1% of available substrate. Protein-methionine-S-oxide reductase activity was demonstrated in pea (Pisum sativum L.) chloroplasts, and enzyme levels in leaves of etiolated and light-grown seedlings were compared.
1 This work was supported by grant 90-37280-5462 from the National Research Institute Competitive Grants Program/U.S. Department of Agriculture. This article has been cited by other articles:
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