The GTPase-activating Protein RGS4 Stabilizes the Transition State for Nucleotide Hydrolysis

RGS proteins constitute a newly appreciated group of negative regulators of G protein signaling. Discovered by genetic screens in yeast, worms, and other organisms, two mammalian RGS proteins, RGS4 and GAIP, act as GTPase-activating proteins for members of the Gi family of G protein α subunits. We h...

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Veröffentlicht in:The Journal of biological chemistry 1996-11, Vol.271 (44), p.27209-27212
Hauptverfasser: Berman, David M., Kozasa, Tohru, Gilman, Alfred G.
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container_end_page 27212
container_issue 44
container_start_page 27209
container_title The Journal of biological chemistry
container_volume 271
creator Berman, David M.
Kozasa, Tohru
Gilman, Alfred G.
description RGS proteins constitute a newly appreciated group of negative regulators of G protein signaling. Discovered by genetic screens in yeast, worms, and other organisms, two mammalian RGS proteins, RGS4 and GAIP, act as GTPase-activating proteins for members of the Gi family of G protein α subunits. We have purified recombinant RGS4 to homogeneity and demonstrate that it acts catalytically to stimulate GTP hydrolysis by Gi proteins. Furthermore, RGS4 stabilizes the transition state for GTP hydrolysis, as evidenced by its high affinity for the GDP-AlF4−-bound forms of Goα and Giα and its relatively low affinity for the GTPγS- and GDP-bound forms of these proteins. Consequently, RGS4 is most likely not a downstream effector for activated Gα subunits. All members of the Gi subfamily of proteins tested are substrates for RGS4 (including Gtα and Gzα); the protein has lower affinity for Gqα, and it does not stimulate the GTPase activity of Gsα or G12α.
doi_str_mv 10.1074/jbc.271.44.27209
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subjects Aluminum Compounds - metabolism
Animals
Fluorides - metabolism
GTP Phosphohydrolases - metabolism
GTP-Binding Proteins - metabolism
GTPase-Activating Proteins
Guanine Nucleotides - metabolism
Guanosine 5'-O-(3-Thiotriphosphate) - metabolism
Guanosine Diphosphate - metabolism
Guanosine Triphosphate - metabolism
Hydrolysis
Kinetics
Mammals
Proteins - isolation & purification
Proteins - metabolism
Recombinant Proteins - isolation & purification
Recombinant Proteins - metabolism
RGS Proteins
title The GTPase-activating Protein RGS4 Stabilizes the Transition State for Nucleotide Hydrolysis
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