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• W2018930462 abstract "The three-dimensional structures of the carboxyl-terminal regions of the P21 protein products of the human Harvey (Ha), Kirsten (KiA and KiB), and neuroblastoma (N) RAS oncogenes and various mutants have been determined by using conformational energy analysis. The carboxyl-terminal region of P21 has been strongly implicated in the binding of the protein to the inner surface of the plasma membrane without which the protein is inactive. The only invariant residue in this region is Cys-186, which is necessary for the post-translational addition of palmitic acid. The surrounding sequences of the active native proteins differ considerably. Nevertheless, certain amino acid substitutions in this region are known to eliminate membrane binding and protein activity, suggesting that there is a conserved common structural feature in this region in the native proteins that is disrupted in the mutant proteins. Conformational energy analysis shows that the four native P21 proteins have a common structure in the form of an alpha-helix for the terminal pentapeptide. A mutant, pBW277, that fails to bind to the membrane and is inactive cannot adopt an alpha-helical structure in this region because of a proline at position 188. Another mutant, pBW766, that retains membrane binding and activity, on the other hand, retains the preference for an alpha-helical conformation in the terminal pentapeptide. These findings suggest that, despite various amino acid sequences in this region, the carboxyl-terminal pentapeptides of the P21 proteins form a distinctive structural domain that must have an alpha-helical structure for membrane binding and intracellular activity." @default.
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• W2018930462 date "1988-08-01" @default.
• W2018930462 modified "2023-10-13" @default.
• W2018930462 title "Structure of the carboxyl terminus of the RAS gene-encoded P21 proteins." @default.
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• W2018930462 doi "https://doi.org/10.1073/pnas.85.16.5869" @default.
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