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Science 26 June 1998:
Vol. 280. no. 5372, pp. 2109 - 2111
DOI: 10.1126/science.280.5372.2109

Reports

p115 RhoGEF, a GTPase Activating Protein for Galpha 12 and Galpha 13

Tohru Kozasa, * Xuejun Jiang, Matthew J. Hart, Pamela M. Sternweis, William D. Singer, Alfred G. Gilman, Gideon Bollag, * Paul C. Sternweis *

Members of the regulators of G protein signaling (RGS) family stimulate the intrinsic guanosine triphosphatase (GTPase) activity of the alpha  subunits of certain heterotrimeric guanine nucleotide-binding proteins (G proteins). The guanine nucleotide exchange factor (GEF) for Rho, p115 RhoGEF, has an amino-terminal region with similarity to RGS proteins. Recombinant p115 RhoGEF and a fusion protein containing the amino terminus of p115 had specific activity as GTPase activating proteins toward the alpha  subunits of the G proteins G12 and G13, but not toward members of the Gs, Gi, or Gq subfamilies of Galpha proteins. This GEF may act as an intermediary in the regulation of Rho proteins by G13 and G12.

T. Kozasa, X. Jiang, P. M. Sternweis, W. D. Singer, A. G. Gilman, P. C. Sternweis, Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX 75235, USA.
M. J. Hart and G. Bollag, Onyx Pharmaceuticals, 3031 Research Drive, Richmond, CA 94806, USA.
*   To whom correspondence should be addressed. E-mail: tohru.kozasa{at}email.swmed.edu (T.K.), bollag{at}onyx-pharm.com (G.B.), and sternwei{at}utsw.swmed.edu (P.C.S.).


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Thermodynamic Characterization of the Binding of Activator of G Protein Signaling 3 (AGS3) and Peptides Derived from AGS3 with G{alpha}i1.
A. Adhikari and S. R. Sprang (2003)
J. Biol. Chem. 278, 51825-51832
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Molecular Basis of Constitutive Production of Basement Membrane Components: GENE EXPRESSION PROFILES OF ENGELBRETH-HOLM-SWARM TUMOR AND F9 EMBRYONAL CARCINOMA CELLS.
S. Futaki, Y. Hayashi, M. Yamashita, K. Yagi, H. Bono, Y. Hayashizaki, Y. Okazaki, and K. Sekiguchi (2003)
J. Biol. Chem. 278, 50691-50701
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