Evidence for an S-farnesylcysteine methyl ester at the carboxyl terminus of the Saccharomyces cerevisiae RAS2 protein
- PMID: 2271607
- DOI: 10.1021/bi00493a021
Evidence for an S-farnesylcysteine methyl ester at the carboxyl terminus of the Saccharomyces cerevisiae RAS2 protein
Abstract
The protein products of yeast and mammalian ras genes are posttranslationally modified to give mature forms that are localized to the inner surface of the plasma membrane. We have previously demonstrated that the mature form of the Saccharomyces cerevisiae RAS2 gene product is methyl esterified at a modified C-terminal cysteine residue. Here we provide evidence that this residue is an S-farnesylcysteine alpha-carboxyl methyl ester. This result establishes common posttranslational modifications for RAS proteins and fungal sex factors. These polypeptides exhibit sequence similarities at their C-termini that appear to be the critical recognition elements for a common set of modification enzymes. In mammalian cells, proteins with analogous C-terminal sequences appear to be prenylated and carboxyl methylated by a similar mechanism.
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