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| | ==The second SH3 domain from Ponsin in complex with the paxillin proline rich region== | | ==The second SH3 domain from Ponsin in complex with the paxillin proline rich region== |
| - | <StructureSection load='2o9v' size='340' side='right' caption='[[2o9v]], [[Resolution|resolution]] 1.63Å' scene=''> | + | <StructureSection load='2o9v' size='340' side='right'caption='[[2o9v]], [[Resolution|resolution]] 1.63Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2o9v]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2O9V OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2O9V FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2o9v]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2O9V OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2O9V FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2o2w|2o2w]], [[2o9s|2o9s]]</td></tr> | + | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[2o2w|2o2w]], [[2o9s|2o9s]]</div></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">SORBS1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr> | + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">SORBS1 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2o9v FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2o9v OCA], [http://pdbe.org/2o9v PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2o9v RCSB], [http://www.ebi.ac.uk/pdbsum/2o9v PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2o9v ProSAT]</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=2o9v FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2o9v OCA], [https://pdbe.org/2o9v PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2o9v RCSB], [https://www.ebi.ac.uk/pdbsum/2o9v PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2o9v ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/SRBS1_HUMAN SRBS1_HUMAN]] Plays a role in tyrosine phosphorylation of CBL by linking CBL to the insulin receptor. Required for insulin-stimulated glucose transport. Involved in formation of actin stress fibers and focal adhesions (By similarity).[UniProtKB:Q62417] [[http://www.uniprot.org/uniprot/PAXI_HUMAN PAXI_HUMAN]] Cytoskeletal protein involved in actin-membrane attachment at sites of cell adhesion to the extracellular matrix (focal adhesion). | + | [[https://www.uniprot.org/uniprot/SRBS1_HUMAN SRBS1_HUMAN]] Plays a role in tyrosine phosphorylation of CBL by linking CBL to the insulin receptor. Required for insulin-stimulated glucose transport. Involved in formation of actin stress fibers and focal adhesions (By similarity).[UniProtKB:Q62417] [[https://www.uniprot.org/uniprot/PAXI_HUMAN PAXI_HUMAN]] Cytoskeletal protein involved in actin-membrane attachment at sites of cell adhesion to the extracellular matrix (focal adhesion). |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
| | Check<jmol> | | Check<jmol> |
| | <jmolCheckbox> | | <jmolCheckbox> |
| - | <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/o9/2o9v_consurf.spt"</scriptWhenChecked> | + | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/o9/2o9v_consurf.spt"</scriptWhenChecked> |
| | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> |
| | <text>to colour the structure by Evolutionary Conservation</text> | | <text>to colour the structure by Evolutionary Conservation</text> |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Human]] | | [[Category: Human]] |
| | + | [[Category: Large Structures]] |
| | [[Category: Pinotsis, N]] | | [[Category: Pinotsis, N]] |
| | [[Category: Wilmanns, M]] | | [[Category: Wilmanns, M]] |
| Structural highlights
Function
[SRBS1_HUMAN] Plays a role in tyrosine phosphorylation of CBL by linking CBL to the insulin receptor. Required for insulin-stimulated glucose transport. Involved in formation of actin stress fibers and focal adhesions (By similarity).[UniProtKB:Q62417] [PAXI_HUMAN] Cytoskeletal protein involved in actin-membrane attachment at sites of cell adhesion to the extracellular matrix (focal adhesion).
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
Muscle differentiation requires the transition from motile myoblasts to sessile myotubes and the assembly of a highly regular contractile apparatus. This striking cytoskeletal remodelling is coordinated with a transformation of focal adhesion-like cell-matrix contacts into costameres. To assess mechanisms underlying this differentiation process, we searched for muscle specific-binding partners of paxillin. We identified an interaction of paxillin with the vinexin adaptor protein family member ponsin in nascent costameres during muscle differentiation, which is mediated by an interaction of the second src homology domain 3 (SH3) domain of ponsin with the proline-rich region of paxillin. To understand the molecular basis of this interaction, we determined the structure of this SH3 domain at 0.83 A resolution, as well as its complex with the paxillin binding peptide at 1.63 A resolution. Upon binding, the paxillin peptide adopts a polyproline-II helix conformation in the complex. Contrary to the charged SH3 binding interface, the peptide contains only non-polar residues and for the first time such an interaction was observed structurally in SH3 domains. Fluorescence titration confirmed the ponsin/paxillin interaction, characterising it further by a weak binding affinity. Transfection experiments revealed further characteristics of ponsin functions in muscle cells: All three SH3 domains in the C terminus of ponsin appeared to synergise in targeting the protein to force-transducing structures. The overexpression of ponsin resulted in altered muscle cell-matrix contact morphology, suggesting its involvement in the establishment of mature costameres. Further evidence for the role of ponsin in the maintenance of mature mechanotransduction sites in cardiomyocytes comes from the observation that ponsin expression was down-regulated in end-stage failing hearts, and that this effect was reverted upon mechanical unloading. These results provide new insights in how low affinity protein-protein interactions may contribute to a fine tuning of cytoskeletal remodelling processes during muscle differentiation and in adult cardiomyocytes.
Paxillin and ponsin interact in nascent costameres of muscle cells.,Gehmlich K, Pinotsis N, Hayess K, van der Ven PF, Milting H, El Banayosy A, Korfer R, Wilmanns M, Ehler E, Furst DO J Mol Biol. 2007 Jun 8;369(3):665-82. Epub 2007 Mar 24. PMID:17462669[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Gehmlich K, Pinotsis N, Hayess K, van der Ven PF, Milting H, El Banayosy A, Korfer R, Wilmanns M, Ehler E, Furst DO. Paxillin and ponsin interact in nascent costameres of muscle cells. J Mol Biol. 2007 Jun 8;369(3):665-82. Epub 2007 Mar 24. PMID:17462669 doi:10.1016/j.jmb.2007.03.050
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