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キーワード:
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要旨:
Organisms amenable to easy genetic analysis should prove helpful in assessing the function of at least those proto-oncogene products which are highly conserved in different eukaryotic cells. One obvious possibility is to pursue the matter in Drosophila melanogaster DNA, which has sequences homologous to several vertebrate oncogenes1–3. Another is to turn to the yeast Saccharomyces cerevisiae, if it contains proto-oncogene sequences. Here we report the identification of a gene in S. cerevisiae which codes for a 206 amino acid protein (YP2) that exhibits striking homology to the p21 products of the human c-has/bas proto-oncogenes4,5 and the transforming p21 proteins of the Harvey (v-rasH)6 and Kirsten (v-rasK)7 murine sarcoma viral oncogenes. The YP2 gene is located between the actin8,9 and the tubulin gene10 on chromosome VI11 and is expressed in growing cells. The protein it encodes might share the nucleotide-binding capacity of p21 proteins22–24.
