The Cdc25 protein of Saccharomyces cerevisiae is required for normal glucose transport

Article Abstract:

Saccharomyces cerevisiae Cdc25 protein is directly involved in glucose transport, as seen through culture studies of 2 temperature-sensitive mutants cdc25-1 and cdc25-5. Inactivation of Cdc25 protein results in reduction of glucose uptake rate. However, this is independent of cAMP levels, G1 arrest, and decrease in protein synthesis in these strains. The results indicate that cdc25-c, being located in the membrane, is involved in the regulation of carbon metabolism.

Analysis, Biological transport, Glucose metabolism

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Repression of nitrogen catabolic genes by ammonia and glutamine in nitrogen-limited continuous cultures of Saccharomyces cerevisiae

Article Abstract:

The differential effects of ammonia and glutamine on the downregulation of nitrogen catabolic genes in Saccharomyces cerevisiae were investigated using a mutant yeast unable to convert ammonia to glutamine. Results reveal that the genetic repression brought about by ammonia is independent of glutamine synthesis. Further, genetic repression due to the presence of ammonia in the medium appears to be mediated by a specific signal to regulate nitrogen catabolites.

Ammonia, Genetic regulation, Glutamine

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Nitrogen-regulated transcription and enzyme activities in continuous cultures of Saccharomyces cerevisiae

Article Abstract:

Saccharomyces cerevisieae were grown in medium which was diluted at different rates and where the only nitrogen source was ammonium chloride. Glutamate dehydrogenase and glutamine synthetase increased their rate of ammonia-metabolism at increasing dilution, while glutamate degradation by glutamate dehydrogenase was slowed down during the same period. In addition, the nitrogen-limiting conditions did not affect the transcription of GAP1.

Genetic transcription, Transcription (Genetics), Yeast, Yeast (Food product)

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