Protein geranylgeranylation, not farnesylation, is required for the G1 to S phase transition in mouse fibroblasts - PubMed (original) (raw)
Comparative Study
. 1996 Nov 7;13(9):1991-9.
Affiliations
- PMID: 8934546
Comparative Study
Protein geranylgeranylation, not farnesylation, is required for the G1 to S phase transition in mouse fibroblasts
A Vogt et al. Oncogene. 1996.
Abstract
In order to assess the relative contributions of farnesylated and/or geranylgeranylated proteins on cell cycle progression from G1 to S phase we designed potent and selective farnesyltransferase (FTI-277) and geranylgeranyltransferase-I (GGTI-298) inhibitors. Flow cytometry studies showed that treatment of NIH3T3 cells with GGTI-298 or lovastatin, which inhibits both protein farnesylation and geranylgeranylation, arrested cells in G0/G1 whereas cells treated with FTI-277 progressed normally through the cell cycle. [3H]thymidine incorporation studies showed that mevalonate and geranylgeraniol, but not farnesol, released the lovastatin G1 block. Furthermore, mevalonate release of the lovastatin G1 block was inhibited by GGTI-298 but not by FTI-277. These results demonstrate that geranylgeranylated proteins are required for cells to proceed from G1 to S phase, and that farnesylated proteins do not play an essential role in the G1 to S phase transition
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