GGTI-286, a potent and cell-permeable GGTase I inhibitor, is 25-fold more potent (IC50=2 μM) than the corresponding methyl ester of FTI-276 . GGTI-286 selectively inhibits geranylgeranylation of Rap1A over farnesylation of H-Ras in NIH3T3 cells (IC50s =2 and >30 μM, respectively). GGTI-286 also potently inhibits oncogenic K-Ras4B stimulation with an IC50 of 1 μM[1].
[1]. E C Lerner, et al. Disruption of oncogenic K-Ras4B processing and signaling by a potent geranylgeranyltransferase I inhibitor. J Biol Chem. 1995 Nov 10;270(45):26770-3. [2]. Naoyuki Nishiya, et al. A zebrafish chemical suppressor screening identifies small molecule inhibitors of the Wnt/β-catenin pathway. Chem Biol. 2014 Apr 24;21(4):530-540.