3AB3 image
Deposition Date 2009-11-30
Release Date 2010-12-29
Last Version Date 2023-11-01
Entry Detail
PDB ID:
3AB3
Title:
Crystal structure of p115RhoGEF RGS domain in complex with G alpha 13
Biological Source:
Source Organism:
Mus musculus (Taxon ID: 10090)
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.40 Å
R-Value Free:
0.28
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Guanine nucleotide-binding protein G(k) subunit alpha, Guanine nucleotide-binding protein subunit alpha-13
Gene (Uniprot):Gna13
Chain IDs:A, C
Chain Length:362
Number of Molecules:2
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:Rho guanine nucleotide exchange factor 1
Gene (Uniprot):ARHGEF1
Chain IDs:B, D
Chain Length:246
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Identification of critical residues in G(alpha)13 for stimulation of p115RhoGEF activity and the structure of the G(alpha)13-p115RhoGEF regulator of G protein signaling homology (RH) domain complex.
J.Biol.Chem. 286 20625 20636 (2011)
PMID: 21507947 DOI: 10.1074/jbc.M110.201392

Abstact

RH-RhoGEFs are a family of guanine nucleotide exchange factors that contain a regulator of G protein signaling homology (RH) domain. The heterotrimeric G protein Gα(13) stimulates the guanine nucleotide exchange factor (GEF) activity of RH-RhoGEFs, leading to activation of RhoA. The mechanism by which Gα(13) stimulates the GEF activity of RH-RhoGEFs, such as p115RhoGEF, has not yet been fully elucidated. Here, specific residues in Gα(13) that mediate activation of p115RhoGEF are identified. Mutation of these residues significantly impairs binding of Gα(13) to p115RhoGEF as well as stimulation of GEF activity. These data suggest that the exchange activity of p115RhoGEF is stimulated allosterically by Gα(13) and not through its interaction with a secondary binding site. A crystal structure of Gα(13) bound to the RH domain of p115RhoGEF is also presented, which differs from a previously crystallized complex with a Gα(13)-Gα(i1) chimera. Taken together, these data provide new insight into the mechanism by which p115RhoGEF is activated by Gα(13).

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Primary Citation of related structures