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Science 28 May 1993:
Vol. 260. no. 5112, pp. 1338 - 1343
DOI: 10.1126/science.8493579

Articles

Science, Vol 260, Issue 5112, 1338-1343
Copyright © 1993 by American Association for the Advancement of Science


articles

Human Sos1: a guanine nucleotide exchange factor for Ras that binds to GRB2

P Chardin, JH Camonis, NW Gale, L van Aelst, J Schlessinger, MH Wigler, and D Bar-Sagi

Institut de Pharmacologie Moleculaire et Cellulaire, CNRS, Valbonne, France.

A human complementary DNA was isolated that encodes a widely expressed protein, hSos1, that is closely related to Sos, the product of the Drosophila son of sevenless gene. The hSos1 protein contains a region of significant sequence similarity to CDC25, a guanine nucleotide exchange factor for Ras from yeast. A fragment of hSos1 encoding the CDC25-related domain complemented loss of CDC25 function in yeast. This hSos1 domain specifically stimulated guanine nucleotide exchange on mammalian Ras proteins in vitro. Mammalian cells overexpressing full-length hSos1 had increased guanine nucleotide exchange activity. Thus hSos1 is a guanine nucleotide exchange factor for Ras. The hSos1 interacted with growth factor receptor-bound protein 2 (GRB2) in vivo and in vitro. This interaction was mediated by the carboxyl-terminal domain of hSos1 and the Src homology 3 (SH3) domains of GRB2. These results suggest that the coupling of receptor tyrosine kinases to Ras signaling is mediated by a molecular complex consisting of GRB2 and hSos1.


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Grb2 Interaction with MEK-Kinase 1 Is Involved in Regulation of Jun-Kinase Activities in Response to Epidermal Growth Factor.
M. Pomerance, M.-C. Multon, F. Parker, C. Venot, J.-P. Blondeau, B. Tocque, and F. Schweighoffer (1998)
J. Biol. Chem. 273, 24301-24304
   Abstract »    Full Text »    PDF »
Structural Requirements for Function of the Crkl Adapter Protein in Fibroblasts and Hematopoietic Cells.
K. Senechal, C. Heaney, B. Druker, and C. L. Sawyers (1998)
Mol. Cell. Biol. 18, 5082-5090
   Abstract »    Full Text »
Ras-GAP Controls Rho-Mediated Cytoskeletal Reorganization through Its SH3 Domain.
V. Leblanc, B. Tocque, and I. Delumeau (1998)
Mol. Cell. Biol. 18, 5567-5578
   Abstract »    Full Text »
Mutation of a Shc Binding Site Tyrosine Residue in ErbB3/HER3 Blocks Heregulin-dependent Activation of Mitogen-activated Protein Kinase.
U. Vijapurkar, K. Cheng, and J. G. Koland (1998)
J. Biol. Chem. 273, 20996-21002
   Abstract »    Full Text »    PDF »
Disabled Is a Putative Adaptor Protein That Functions during Signaling by the Sevenless Receptor Tyrosine Kinase.
N. Le and M. A. Simon (1998)
Mol. Cell. Biol. 18, 4844-4854
   Abstract »    Full Text »
A New Tyrosine-phosphorylated 97-kDa Adaptor Protein Mediates Interleukin-2-induced Association of SHP-2 with p85-Phosphatidylinositol 3-Kinase in Human T Lymphocytes.
F. Gesbert, C. Guenzi, and J. Bertoglio (1998)
J. Biol. Chem. 273, 18273-18281
   Abstract »    Full Text »    PDF »
Growth Factor Receptor-Bound Protein 2 (Grb2) Association with Hemopoietic Specific Protein 1: Linkage Between Lck and Grb2.
Y. Takemoto, M. Furuta, M. Sato, P. R. Findell, W. Ramble, and Y. Hashimoto (1998)
J. Immunol. 161, 625-630
   Abstract »    Full Text »    PDF »
RhoG GTPase Controls a Pathway That Independently Activates Rac1 and Cdc42Hs.
C. Gauthier-Rouvière, E. Vignal, M. Mériane, P. Roux, P. Montcourier, and P. Fort (1998)
Mol. Biol. Cell 9, 1379-1394
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Insulin Receptor-mediated Dissociation of Grb2 from Sos Involves Phosphorylation of Sos by Kinase(s) Other than Extracellular Signal-regulated Kinase.
H. Zhao, S. Okada, J. E. Pessin, and G. A. Koretzky (1998)
J. Biol. Chem. 273, 12061-12067
   Abstract »    Full Text »    PDF »
RasGRP, a Ras Guanyl Nucleotide- Releasing Protein with Calcium- and Diacylglycerol-Binding Motifs.
J. O. Ebinu, D. A. Bottorff, E. Y. Chan, S. L. Stang, R. J. Dunn, and J. C. Stone (1998)
Science 280, 1082-1086
   Abstract »    Full Text »
Diversity of HIV-1 Vpr Interactions Involves Usage of the WXXF Motif of Host Cell Proteins.
M. BouHamdan, Y. Xue, Y. Baudat, B. Hu, J. Sire, R. J. Pomerantz, and L.-X. Duan (1998)
J. Biol. Chem. 273, 8009-8016
   Abstract »    Full Text »    PDF »
Grb2 and Its Apoptotic Isoform Grb3-3 Associate with Heterogeneous Nuclear Ribonucleoprotein C, and These Interactions Are Modulated by Poly(U) RNA.
F. Romero, F. Ramos-Morales, A. Dominguez, R. M. Rios, F. Schweighoffer, B. Tocque, J. A. Pintor-Toro, S. Fischer, and M. Tortolero (1998)
J. Biol. Chem. 273, 7776-7781
   Abstract »    Full Text »    PDF »
Antagonism of glucocorticoid receptor transcriptional activation by the c-Jun N-terminal kinase.
I. Rogatsky, S. K. Logan, and M. J. Garabedian (1998)
PNAS 95, 2050-2055
   Abstract »    Full Text »    PDF »
Differential Coupling of Membrane Ig and CD40 to the Extracellularly Regulated Kinase Signaling Pathway.
J. M. Purkerson and D. C. Parker (1998)
J. Immunol. 160, 2121-2129
   Abstract »    Full Text »    PDF »
N Terminus of Sos1 Ras Exchange Factor: Critical Roles for the Dbl and Pleckstrin Homology Domains.
X. Qian, W. C. Vass, A. G. Papageorge, P. H. Anborgh, and D. R. Lowy (1998)
Mol. Cell. Biol. 18, 771-778
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Regulation of Sos Activity by Intramolecular Interactions.
S. Corbalan-Garcia, S. M. Margarit, D. Galron, S.-s. Yang, and D. Bar-Sagi (1998)
Mol. Cell. Biol. 18, 880-886
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Epidermal Growth Factor Induction of the c-jun Promoter by a Rac Pathway.
N. Clarke, N. Arenzana, T. Hai, A. Minden, and R. Prywes (1998)
Mol. Cell. Biol. 18, 1065-1073
   Abstract »    Full Text »
Ras-GRF Activates Ha-Ras, but Not N-Ras or K-Ras 4B, Protein in Vivo.
M. K. Jones and J. H. Jackson (1998)
J. Biol. Chem. 273, 1782-1787
   Abstract »    Full Text »    PDF »
Effects of Mechanical Forces on Signal Transduction and Gene Expression in Endothelial Cells.
S. Chien, S. Li, and J. Y-J. Shyy (1998)
Hypertension 31, 162-169
   Abstract »    Full Text »    PDF »



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