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  • Title: SDC25, a CDC25-like gene which contains a RAS-activating domain and is a dispensable gene of Saccharomyces cerevisiae.
    Author: Damak F, Boy-Marcotte E, Le-Roscouet D, Guilbaud R, Jacquet M.
    Journal: Mol Cell Biol; 1991 Jan; 11(1):202-12. PubMed ID: 1986220.
    Abstract:
    In the yeast Saccharomyces cerevisiae, the CDC25 gene product activates adenylate cyclase through RAS1 and RAS2 gene products. We have recently described the cloning of a DNA fragment which suppresses the cdc25 mutation but not ras1, ras2, or cdc35 mutations. This fragment contains a 5'-truncated open reading frame which shares 47% identity with the C-terminal part of the CDC25 gene. We named the entire gene SDC25. In this paper, we report the cloning, sequencing, and characterization of the complete SDC25 gene. The SDC25 gene is located on the chromosome XII close to the centromere. It is transcribed into a 4-kb-long mRNA that contains an open reading frame of 1,251 codons. Homology with the CDC25 gene extends in the N-terminal part, although the degree of similarity is lower than in the C-terminal part. In contrast with the C-terminal part, the complete SDC25 gene was found not to suppress the CDC25 gene defect. A deletion in the N-terminal part restored the suppressing activity, a result which suggests the existence of a regulatory domain. The SDC25 gene was found to be dispensable for cell growth under usual conditions. No noticeable phenotype was found in the deleted strain.
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