The mechanism of deuterium oxide-induced protein degradation in Lemna minor |
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| Authors: | R. J. Cooke S. Grego K. Roberts D. D. Davies |
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| Affiliation: | (1) School of Biological Sciences, University of East Anglia, NR4 7TJ Norwich, UK;(2) Laboratory of Plant Radiobiochemistry and Ecophysiology, Consiglio Nazionale della Richerche, Area della Ricerca, Montelibretti, Rome, Italy;(3) John Innes Institute, Colney Lane, NR4 7UH Norwich, UK |
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| Abstract: | Transfer of Lemna minor fronds to culture medium containing 50% (v/v) deuterium oxide induces a large increase in the rate of protein breakdown, which is not due to an increase in the activity of acidic or neutral proteolytic enzymes or peptidases. Biochemical and ultrastructural evidence indicates that deuterium oxide affects the properties of certain membranes, particularly the tonoplast, and allows vacuolar proteolytic enzymes to pass into the cytoplasm and cause the increased protein breakdown.Abbreviations BAPA benzylarginine-p-nitroanilide - LPA leucine-p-nitroanilide - TCA trichloroacetic acid |
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| Keywords: | Deuterium oxide Lemna Protein degradation Stress (D2O) Tonoplast properties |
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