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Identification of the guanine nucleotide dissociation stimulator for Ral as a putative effector molecule of R-ras, H-ras, K-ras, and Rap.
To identify proteins that bind to the Ras-related protein R-ras we performed a yeast two-hybrid cDNA library screen. Several clones were obtained encoding the C-terminal region of the guanine nucleotide dissociation stimulator for Ral (RalGDS). The R-ras-binding domain of RalGDS (RalGDS-RBD) is dist...
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| Main Authors: | , |
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| Formato: | Artigo |
| Idioma: | en |
| Publicado em: |
1994
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| Assuntos: | |
| Acesso em linha: | https://ncbi.nlm.nih.gov/pmc/articles/PMC45488/ https://ncbi.nlm.nih.gov/pubmed/7809086 |
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| Resumo: | To identify proteins that bind to the Ras-related protein R-ras we performed a yeast two-hybrid cDNA library screen. Several clones were obtained encoding the C-terminal region of the guanine nucleotide dissociation stimulator for Ral (RalGDS). The R-ras-binding domain of RalGDS (RalGDS-RBD) is distinct from the conserved catalytic exchange factor regions. Using the two-hybrid system, we show that RalGDS-RBD interacts with H-ras, K-ras, and Rap, and with active but not with inactive point mutants of these Ras-like GTPases. Moreover, using purified proteins, we demonstrate the direct GTP-dependent interaction of the Ras-like GTPases with RalGDS-RBD and full-length RalGDS in vitro. Furthermore, we show that RalGDS-RBD and the Ras-binding domain of Raf-1 compete for binding to the Ras-like GTPases. These data indicate that RalGDS is a putative effector molecule for R-ras, H-ras, K-ras, and Rap. |
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