View source for 1zsg


==beta PIX-SH3 complexed with an atypical peptide from alpha-PAK==
<StructureSection load='1zsg' size='340' side='right'caption='[[1zsg]], [[NMR_Ensembles_of_Models | 30 NMR models]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1zsg]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Human Human]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZSG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ZSG FirstGlance]. <br>
</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ARHGEF7, COOL1, KIAA0142, P85SPR, PAK3BP, PIXB ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Transferase Transferase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.11.1, 2.7.11.8, 2.7.11.9, 2.7.11.10, 2.7.11.11, 2.7.11.12, 2.7.11.13, 2.7.11.21, 2.7.11.22, 2.7.11.24, 2.7.11.25, 2.7.11.30 and 2.7.12.1 2.7.11.1, 2.7.11.8, 2.7.11.9, 2.7.11.10, 2.7.11.11, 2.7.11.12, 2.7.11.13, 2.7.11.21, 2.7.11.22, 2.7.11.24, 2.7.11.25, 2.7.11.30 and 2.7.12.1] </span></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=1zsg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1zsg OCA], [https://pdbe.org/1zsg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1zsg RCSB], [https://www.ebi.ac.uk/pdbsum/1zsg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1zsg ProSAT]</span></td></tr>
</table>
== Function ==
[[https://www.uniprot.org/uniprot/ARHG7_HUMAN ARHG7_HUMAN]] 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 (By similarity). 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.<ref>PMID:19041750</ref> <ref>PMID:18716323</ref> <ref>PMID:18184567</ref>  [[https://www.uniprot.org/uniprot/PAK1_HUMAN PAK1_HUMAN]] Protein kinase involved in intracellular signaling pathways downstream of integrins and receptor-type kinases that plays an important role in cytoskeleton dynamics, in cell adhesion, migration, proliferation, apoptosis, mitosis, and in vesicle-mediated transport processes. Can directly phosphorylate BAD and protects cells against apoptosis. Activated by interaction with CDC42 and RAC1. Functions as GTPase effector that links the Rho-related GTPases CDC42 and RAC1 to the JNK MAP kinase pathway. Phosphorylates and activates MAP2K1, and thereby mediates activation of downstream MAP kinases. Involved in the reorganization of the actin cytoskeleton, actin stress fibers and of focal adhesion complexes. Phosphorylates the tubulin chaperone TBCB and thereby plays a role in the regulation of microtubule biogenesis and organization of the tubulin cytoskeleton. Plays a role in the regulation of insulin secretion in response to elevated glucose levels. Part of a ternary complex that contains PAK1, DVL1 and MUSK that is important for MUSK-dependent regulation of AChR clustering during the formation of the neuromuscular junction (NMJ). Activity is inhibited in cells undergoing apoptosis, potentially due to binding of CDC2L1 and CDC2L2. Phosphorylates MYL9/MLC2. Phosphorylates RAF1 at 'Ser-338' and 'Ser-339' resulting in: activation of RAF1, stimulation of RAF1 translocation to mitochondria, phosphorylation of BAD by RAF1, and RAF1 binding to BCL2.<ref>PMID:8805275</ref> <ref>PMID:9395435</ref> <ref>PMID:9032240</ref> <ref>PMID:9528787</ref> <ref>PMID:10551809</ref> <ref>PMID:11733498</ref> <ref>PMID:12624090</ref> <ref>PMID:12876277</ref> <ref>PMID:14585966</ref> <ref>PMID:15611088</ref> <ref>PMID:15831477</ref> <ref>PMID:16278681</ref> <ref>PMID:17726028</ref> <ref>PMID:17989089</ref> <ref>PMID:22669945</ref>  
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/zs/1zsg_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=1zsg ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The PAK Ser/Thr kinases are important downstream effectors of the Rho family GTPases Cdc42 and Rac, partly mediating the role of these G proteins in cell proliferation and cytoskeletal rearrangements. As well as small G proteins, PAK interacts with the Cdc42/Rac exchange factor beta-PIX via the PIX SH3 domain and a nontypical Pro-rich region in PAK. This interaction is thought to affect the localization of PAK, as well as increased GTP/GDP exchange of Rac and Cdc42. We have determined the structure of the PIX-SH3/PAK peptide complex and shown that it differs from typical Src-like SH3/peptide complexes. The peptide makes contacts through the Pro-rich sequence in a similar way to standard SH3/peptide complexes, even though the Pro residue positions are not conserved. In addition, there are interactions with a Pro and Lys in the PAK, which are C-terminal to the conserved Arg found in all SH3-binding sequences. These contact a fourth binding pocket on the SH3 domain. We have measured the affinity of PIX-SH3 for the PAK peptide and found that it is of intermediate affinity. When PAK is activated, Ser-199 in the PIX-binding site is phosphorylated. This phosphorylation is sufficient to reduce the affinity for PIX 6-fold.

Structural analysis of the SH3 domain of beta-PIX and its interaction with alpha-p21 activated kinase (PAK).,Mott HR, Nietlispach D, Evetts KA, Owen D Biochemistry. 2005 Aug 23;44(33):10977-83. PMID:16101281<ref>PMID:16101281</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1zsg" style="background-color:#fffaf0;"></div>

==See Also==
*[[Rho guanine nucleotide exchange factor 3D structures|Rho guanine nucleotide exchange factor 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Human]]
[[Category: Large Structures]]
[[Category: Transferase]]
[[Category: Evetts, K A]]
[[Category: Mott, H R]]
[[Category: Nietlispach, D]]
[[Category: Owen, D]]
[[Category: Sh3-peptide complex]]