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Abstract
We report a class of interfering mutants of the human H-ras gene capable of inhibiting phenotypes arising from the expression of the activated RAS2 gene, RAS2val19, in the yeast Saccharomyces cerevisiae. All these mutants encode unprocessed H-ras proteins that remain in the cytoplasm. One of the mutants, H-rasarg186, was examined in detail. H-rasarg186 protein is a competitive inhibitor of RAS2val19 protein. It does not interfere with processing and membrane localization of RAS2val19, nor does it appear to compete with RAS protein for its proposed regulator, the CDC25 protein. By several criteria the RAS2val19 adenylate cyclase interaction is unaffected by H-rasarg186. We infer from our results that H-rasarg186 protein interferes with an alternative function of RAS2val19.
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