3ab3
From Proteopedia
Crystal structure of p115RhoGEF RGS domain in complex with G alpha 13
Structural highlights
Function[GNAI3_MOUSE] Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems. G(k) is the stimulatory G protein of receptor-regulated K(+) channels. The active GTP-bound form prevents the association of RGS14 with centrosomes and is required for the translocation of RGS14 from the cytoplasm to the plasma membrane. May play a role in cell division. [ARHG1_HUMAN] Seems to play a role in the regulation of RhoA GTPase by guanine nucleotide-binding alpha-12 (GNA12) and alpha-13 (GNA13) subunits. Acts as GTPase-activating protein (GAP) for GNA12 and GNA13, and as guanine nucleotide exchange factor (GEF) for RhoA GTPase. Activated G alpha 13/GNA13 stimulates the RhoGEF activity through interaction with the RGS-like domain. This GEF activity is inhibited by binding to activated GNA12. Mediates angiotensin-2-induced RhoA activation.[1] [2] [3] [4] Publication Abstract from PubMedRH-RhoGEFs are a family of guanine nucleotide exchange factors that contain a regulator of G protein signaling homology (RH) domain. The heterotrimeric G protein Galpha(13) stimulates the guanine nucleotide exchange factor (GEF) activity of RH-RhoGEFs, leading to activation of RhoA. The mechanism by which Galpha(13) stimulates the GEF activity of RH-RhoGEFs, such as p115RhoGEF, has not yet been fully elucidated. Here, specific residues in Galpha(13) that mediate activation of p115RhoGEF are identified. Mutation of these residues significantly impairs binding of Galpha(13) to p115RhoGEF as well as stimulation of GEF activity. These data suggest that the exchange activity of p115RhoGEF is stimulated allosterically by Galpha(13) and not through its interaction with a secondary binding site. A crystal structure of Galpha(13) bound to the RH domain of p115RhoGEF is also presented, which differs from a previously crystallized complex with a Galpha(13)-Galpha(i1) chimera. Taken together, these data provide new insight into the mechanism by which p115RhoGEF is activated by Galpha(13). 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.,Hajicek N, Kukimoto-Niino M, Mishima-Tsumagari C, Chow CR, Shirouzu M, Terada T, Patel M, Yokoyama S, Kozasa T J Biol Chem. 2011 Jun 10;286(23):20625-36. Epub 2011 Apr 20. PMID:21507947[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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Categories: Homo sapiens | Mus musculus | Kozasa, T | Kukimoto-Niino, M | Mishima, C | Shirouzu, M | Yokoyama, S | Gtp-binding | Gtpase activation | Guanine-nucleotide releasing factor | Lipoprotein | Membrane | Nucleotide-binding | Palmitate | Phosphoprotein | Protein complex | Signal transduction | Signaling protein-membrane protein complex | Transducer
