Abstract
The importance of the post-translational lipid modifications farnesylation and geranylgeranylation in protein localization and function coupled with the critical role of prenylated proteins in malignant transformation has prompted interest in their biology and the development of farnesyl transferase and geranylgeranyl transferase inhibitors (FTIs and GGTIs) as chemical probes and anticancer agents. The ability to measure protein prenylation before and after FTI and GGTI treatment is important to understanding and interpreting the effects of these agents on signal transduction pathways and cellular phenotypes, as well as to the use of prenylation as a biomarker. Here we describe protocols to measure the degree of protein prenylation by farnesyl transferase or geranylgeranyl transferase in vitro, in cultured cells and in tumors from animals and humans. The assays use [3H]farnesyl diphosphate and [3H]geranylgeranyl diphosphate, electrophoretic mobility shift, membrane association using subcellular fractionation or immunofluorescence of intact cells, [3H]mevalonic acid labeling, followed by immunoprecipitation and SDS-PAGE, and in vitro transcription, translation and prenylation in reticulocyte lysates. These protocols require from 1 d (enzyme assays) to up to 3 months (autoradiography of [3H]-labeled proteins).
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Acknowledgements
This work was supported by grants from the NIH CA067771 (S.M.S) and CA098473 (S.M.S.). We thank A.D. Hamilton and his group for a wonderful and highly productive collaboration and M.A. Blaskovich and A. Kazi for their excellent suggestions. We also thank the past and present members of the Sebti lab for their contributions to this work, particularly J. Adnane, M.E. Balasis, M.A. Blaskovich, C. Bucher, P.M. Campbell, A.E. Carie, Z. Chen, N.C.Crespo, F. Delarue, S.C. Falsetti, K. Forinash, K. Jiang, A. Kazi, E.C. Lerner, T.F. McGuire, M. Nigam, S. Paquette, R. Patel, J. Sun, Y. Sun, V. Thai, A. Vogt, D. Wang, A. Tecleab, H. Yang and K. Zhu.
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Berndt, N., Sebti, S. Measurement of protein farnesylation and geranylgeranylation in vitro, in cultured cells and in biopsies, and the effects of prenyl transferase inhibitors. Nat Protoc 6, 1775–1791 (2011). https://doi.org/10.1038/nprot.2011.387
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DOI: https://doi.org/10.1038/nprot.2011.387
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