2p4r

Structural basis for a novel interaction between AIP4 and beta-PIX

spinqualitylabelsall models 2p4r, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2p4r is a 2 chain structure with sequence from Homo sapiens and Rattus norvegicus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.001Å Ligands: GOL, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ARHG7_RAT Acts as a RAC1 guanine nucleotide exchange factor (GEF) and can induce membrane ruffling. Functions in cell migration, attachment and cell spreading. Promotes targeting of RAC1 to focal adhesions. May function as a positive regulator of apoptosis. Downstream of NMDA receptors and CaMKK-CaMK1 signaling cascade, promotes the formation of spines and synapses in hippocampal neurons (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Cross-talk between G protein-coupled receptors and receptor tyrosine kinase signaling pathways is crucial to the efficient relay and integration of cellular information. Here we identify and define the novel binding interaction of the E3 ubiquitin ligase atrophin-interacting protein 4 (AIP4) with the GTP exchange factor beta-p21-activated kinase-interactive exchange factor (beta PIX). We demonstrate that this interaction is mediated in part by the beta PIX-SH3 domain binding to a proline-rich stretch of AIP4. Analysis of the interaction by isothermal calorimetry is consistent with a heterotrimeric complex with one AIP4-derived peptide binding to two beta PIX-SH3 domains. We determined the crystal structure of the beta PIX-SH3.AIP4 complex to 2.0-A resolution. In contrast to the calorimetry results, the crystal structure shows a monomeric complex in which AIP4 peptide binds the beta PIX-SH3 domain as a canonical Class I ligand with an additional type II polyproline helix that makes extensive contacts with another face of beta PIX. Taken together, the novel interaction between AIP4 and beta PIX represents a new regulatory node for G protein-coupled receptor and receptor tyrosine kinase signal integration. Our structure of the beta PIX-SH3.AIP4 complex provides important insight into the mechanistic basis for beta PIX scaffolding of signaling components, especially those involved in cross-talk. A novel interaction between atrophin-interacting protein 4 and beta-p21-activated kinase-interactive exchange factor is mediated by an SH3 domain.,Janz JM, Sakmar TP, Min KC J Biol Chem. 2007 Sep 28;282(39):28893-903. Epub 2007 Jul 25. PMID:17652093 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Rho guanine nucleotide exchange factor 3D structures

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