Direct demonstration of geranylgeranylation and farnesylation of Ki-Ras in vivo.

The Journal of Biological Chemistry
C A RowellA M Garcia

Abstract

It has recently been reported that Ki-Ras protein can be modified in vitro by farnesylation or geranylgeranylation. However, a previous analysis of Ki-Ras prenylation in vivo found only farnesylated Ki-Ras. In this report it is shown that under normal conditions, Ki-Ras is farnesylated in vivo and when cells are treated with the farnesyl transferase inhibitors B956 or B957, farnesylation is inhibited and Ki-Ras becomes geranylgeranylated in a dose dependent manner. These results have strong implications in the design of anticancer drugs based on inhibition of prenylation.

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