The effect of thiols onSaccharomyces fragilis |
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Authors: | R Davies Frances J Wayman |
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Institution: | (1) Medical Research Council, University of Cambridge, CB2 1QW Cambridge, England;(2) Department of Biochemistry, University of Cambridge, CB2 1QW Cambridge, England |
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Abstract: | Treatment of cell suspensions ofSaccharomyces fragilis with 0.01m β-mercaptoethanol or dithiothreitol released a variety of substances of high and low molecular weight. Twenty-two high-molecular-weight
glycoproteins were separated by a combination of chromatography on DEAE cellulose and polyacrylamide gel electrophoresis in
presence of sodium dodecylsulphate. The carbohydrate components consisted of at least 95% mannose and the protein components
had threonine and serine as the major amino acids. Only very small amounts of phosphorus were associated with the high-molecular-weight
components. The low-molecular-weight substances were probably released from the internal cell pool and uracil and hypoxanthine
were identified as components of this fraction. It is suggested that in addition to breaking disulphide bridges in the cell
wall the thiols may also render the plasmalemma permeable to certain low-molecular-weight substances. Such effects are not
lethal since the yeast can be trained to grow in presence of 0.01m mercaptoethanol. |
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