Abstract
Rap1 is a Ras-related GTPase that is principally involved in integrin- and E-cadherin-mediated adhesion. Rap1 is transiently activated in response to many incoming signals via a large family of guanine nucleotide exchange factors (GEFs). The lack of potent Rap1 dominant-negative mutants has limited our ability to decipher Rap1-dependent pathways; we have therefore developed a procedure to generate such mutants consisting in the oligonucleotide-mediated mutagenesis of residues 14–19, selection of mutants presenting an enhanced interaction with Epac2 by yeast two-hybrid screening and counter-screening for mutants still interacting with Rap effectors. In detail analysis of their interaction capacity with various Rap-GEFs in the yeast two-hybrid system revealed that mutants of residues 15 and 16 interacted with Epacs, C3G and CalDAG-GEFI, whereas mutants of position 17 had selectively lost their ability to bind CalDAG-GEFI as well as, for some, C3G. In cellular models where Rap1 is activated via endogenous GEFs, the Rap1[S17A] mutant inhibits both the cAMP–Epac and EGF–C3G pathways, whereas Rap1[G15D] selectively interferes with the latter. Finally, Rap1[S17A] is able to act as a bona fide dominant-negative mutant in vivo since it phenocopies the eye-reducing and lethal effects of D-Rap1 deficiency in Drosophila, effects that are overcome by the overexpression of D-Epac or D-Rap1.
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Acknowledgements
We are indebted to Drs J Flanders and J Hancock for plasmids, to Pr M Matsuda for C3G expression vectors and related antibodies, to Drs U Gaul, E Hafen and I Hariharan for Drosophila constructs and strains, to Dr F Lezoualc'h for the CHO-5HT4b cell line, and to Dr M Balakireva for Drosophila lines as well as critical reading of the manuscript. This work was funded in part by a grant from the Association pour la Recherche contre le Cancer. A Dupuy and S L'Hoste were successively supported by doctoral fellowships from the Ministère de la Recherche and the Association pour la Recherche contre le Cancer. G Gaudriault was the recipient of a postdoctoral fellowship from the Association pour la Recherche contre le Cancer.
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Dupuy, A., L'Hoste, S., Cherfils, J. et al. Novel Rap1 dominant-negative mutants interfere selectively with C3G and Epac. Oncogene 24, 4509–4520 (2005). https://doi.org/10.1038/sj.onc.1208647
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DOI: https://doi.org/10.1038/sj.onc.1208647
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