Protein prenylation, involving the alkylation of a specific C-terminal cysteine with a C15 or C20 isoprenoid unit, is an essential posttranslational modification required by most GTP- binding proteins for normal biological activity. Despite the ubiquitous nature of this modification and numerous efforts aimed at inhibiting prenylating enzymes for therapeutic purposes, the function of prenylation remains unclear. To explore the role the isoprenoid ...