View source for 2df6


==Crystal Structure of the SH3 Domain of betaPIX in Complex with a High Affinity Peptide from PAK2==
<StructureSection load='2df6' size='340' side='right'caption='[[2df6]], [[Resolution|resolution]] 1.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2df6]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2DF6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2DF6 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.3&#8491;</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2df6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2df6 OCA], [https://pdbe.org/2df6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2df6 RCSB], [https://www.ebi.ac.uk/pdbsum/2df6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2df6 ProSAT]</span></td></tr>
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== Function ==
[https://www.uniprot.org/uniprot/ARHG7_RAT 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 ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
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    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/df/2df6_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2df6 ConSurf].
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== Publication Abstract from PubMed ==
The p21-activated kinases (PAKs) are important effector proteins of the small GTPases Cdc42 and Rac and control cytoskeletal rearrangements and cell proliferation. The direct interaction of PAKs with guanine nucleotide exchange factors from the PIX/Cool family, which is responsible for the localization of PAK kinases to focal complexes in the cell, is mediated by a 24-residue peptide segment in PAKs and an N-terminal src homology 3 (SH3) domain in PIX/Cool. The SH3-binding segment of PAK contains the atypical consensus-binding motif PxxxPR, which is required for unusually high affinity binding. In order to understand the structural basis for the high affinity and specificity of the PIX-PAK interaction, we solved crystal structures for the N-terminal SH3 domain of betaPIX and for the complex of the atypical binding segment of PAK2 with the N-terminal SH3 domain of betaPIX at 0.92 A and 1.3A resolution, respectively. The asymmetric unit of the crystal contains two SH3 domains and two peptide ligands. The bound peptide adopts a conformation that allows for intimate contacts with three grooves on the surface of the SH3 domain that lie between the n-Src and RT-loops. Most notably, the arginine residue of the PxxxPR motif forms a salt-bridge and is tightly coordinated by a number of residues in the SH3 domain. This arginine-specific interaction appears to be the key determinant for the high affinity binding of PAK peptides. Furthermore, C-terminal residues of the peptide engage in additional interactions with the surface of the RT-loop, which significantly increases binding specificity. Compared to a recent NMR structure of a similar complex, our crystal structure reveals an alternate binding mode. Finally, we compare our crystal structure with the recently published betaPIX/Cbl-b complex structure, and suggest the existence of a molecular switch.

Crystal structure of the SH3 domain of betaPIX in complex with a high affinity peptide from PAK2.,Hoelz A, Janz JM, Lawrie SD, Corwin B, Lee A, Sakmar TP J Mol Biol. 2006 Apr 28;358(2):509-22. Epub 2006 Feb 28. PMID:16527308<ref>PMID:16527308</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Rho guanine nucleotide exchange factor 3D structures|Rho guanine nucleotide exchange factor 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Rattus norvegicus]]
[[Category: Hoelz A]]