Reference: Hansen RJ, et al. (1977) Effects of glucose and nitrogen source on the levels of proteinases, peptidases, and proteinase inhibitors in yeast. Biochim Biophys Acta 496(1):103-14

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Abstract


In Saccharomyces cerevisiae harvested from early exponential growth on glucose-containing media, the specifc activities of proteinases A and B, carboxypeptidase Y, and the inhibitors IA, IB, IC of these three proteinases, respectively, are found to be 10-30% of the specific activities observed in media without glucose, containing acetate as a carbon source; the activities of two aminopeptidases in glucose-grown cells were 30-50% of those in acetate-grown cells. In contrast to fructose-biphosphatase, phosoenolpyruvate carboxykinase, and cytoplasmic malate dehydrogenase, which are inactivated after the addition of glucose to derepressed cells, the proteinases and inhibitors are not inactivated after glucose addition, but appear to be repressed. Growth of the yeast on poor nitrogen sources or starvation for nitrogen results in 2-3 fold increases in the levels of most proteinases and peptidases, but this effect is not observed with glucose as the carbon source.

Reference Type
Journal Article | Research Support, U.S. Gov't, P.H.S.
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Hansen RJ, Switzer RL, Hinze H, Holzer H
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