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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A new RAS mutation that suppresses the CDC25 gene requirement for growth of Saccharomyces cerevisiae.

In the yeast Saccharomyces cerevisiae, the activation of adenylate cyclase requires the products of the RAS genes and of CDC25. We isolated several dominant extragenic suppressors of the yeast cdc25 mutation. They did not suppress a thermosensitive allele of the adenylate cyclase gene (CDC35). One of these suppressors was a mutated RAS2 gene in which the transition C/G----T/A at position 455 resulted in replacement of threonine 152 by isoleucine in the protein. The same mutation in a v-Ha-ras gene reduces the affinity of p21 for guanine nucleotides (L.A. Feig, B. Pan, T.M. Roberts, and G.M. Cooper, Proc. Natl. Acad. Sci. USA 83:4607-4611, 1986). These results support a model in which the CDC25 gene product is the GDP-GTP exchange factor regulating the activity of the RAS gene product.[1]


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