Farnesyltransferase as a target for anticancer drug design

Biopolymers
Y QianA D Hamilton

Abstract

The currently understood function for Ras in signal transduction is in mediating the transmission of signals from external growth factors to the cell nucleus. Mutated forms of this GTP-binding protein are found in 30% of human cancers with particularly high prevalence in colon and pancreatic carcinomas. These mutations destroy the GTPase activity of Ras and cause the protein to be locked in its active, GTP bound form. As a result, the signaling pathways are activated, leading to uncontrolled tumor growth. Ras function in signaling requires its association with the plasma membrane. This is achieved by posttranslational farnesylation of a cysteine residue present as part of the CA1A2X carboxyl terminal tetrapeptide of all Ras proteins. The enzyme that recognizes and farnesylates the CA1A2X sequence, Ras farnesyltransferase (FTase), has become an important target for the design of inhibitors that might be interesting as antitumor agents. Several approaches have been taken in the search for in vivo active inhibitors of farnesyltransferase. These include the identification of natural products such as the chaetomellic and zaragozic acids that mimic farnesylpyrophosphate, bisubstrate transition state analogs combining elements of the ...Continue Reading

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