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== | ==I DOMAIN FROM INTEGRIN ALPHA2-BETA1== | ||
We have determined the high resolution crystal structure of the I domain | <StructureSection load='1aox' size='340' side='right'caption='[[1aox]], [[Resolution|resolution]] 2.10Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1aox]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AOX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1AOX 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]] 2.1Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></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=1aox FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1aox OCA], [https://pdbe.org/1aox PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1aox RCSB], [https://www.ebi.ac.uk/pdbsum/1aox PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1aox ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/ITA2_HUMAN ITA2_HUMAN] Integrin alpha-2/beta-1 is a receptor for laminin, collagen, collagen C-propeptides, fibronectin and E-cadherin. It recognizes the proline-hydroxylated sequence G-F-P-G-E-R in collagen. It is responsible for adhesion of platelets and other cells to collagens, modulation of collagen and collagenase gene expression, force generation and organization of newly synthesized extracellular matrix. | |||
== 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/ao/1aox_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1aox ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
We have determined the high resolution crystal structure of the I domain from the alpha-subunit of the integrin alpha2beta1, a cell surface adhesion receptor for collagen and the human pathogen echovirus-1. The domain, as expected, adopts the dinucleotide-binding fold, and contains a metal ion-dependent adhesion site motif with bound Mg2+ at the top of the beta-sheet. Comparison with the crystal structures of the leukocyte integrin I domains reveals a new helix (the C-helix) protruding from the metal ion-dependent adhesion site face of the domain which creates a groove centered on the magnesium ion. Modeling of a collagen triple helix into the groove suggests that a glutamic acid side chain from collagen can coordinate the metal ion, and that the C-helix insert is a major determinant of binding specificity. The binding site for echovirus-1 maps to a distinct surface of the alpha2-I domain (one edge of the beta-sheet), consistent with data showing that virus and collagen binding occur by different mechanisms. Comparison with the homologous von Willebrand factor A3 domain, which also binds collagen, suggests that the two domains bind collagen in different ways. | |||
Crystal structure of the I domain from integrin alpha2beta1.,Emsley J, King SL, Bergelson JM, Liddington RC J Biol Chem. 1997 Nov 7;272(45):28512-7. PMID:9353312<ref>PMID:9353312</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1aox" style="background-color:#fffaf0;"></div> | |||
== | ==See Also== | ||
*[[Integrin 3D structures|Integrin 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Bergelson | [[Category: Bergelson JM]] | ||
[[Category: Emsley | [[Category: Emsley J]] | ||
[[Category: King | [[Category: King SL]] | ||
[[Category: Liddington | [[Category: Liddington RC]] | ||
Latest revision as of 09:23, 30 October 2024
I DOMAIN FROM INTEGRIN ALPHA2-BETA1I DOMAIN FROM INTEGRIN ALPHA2-BETA1
Structural highlights
FunctionITA2_HUMAN Integrin alpha-2/beta-1 is a receptor for laminin, collagen, collagen C-propeptides, fibronectin and E-cadherin. It recognizes the proline-hydroxylated sequence G-F-P-G-E-R in collagen. It is responsible for adhesion of platelets and other cells to collagens, modulation of collagen and collagenase gene expression, force generation and organization of newly synthesized extracellular matrix. 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 PubMedWe have determined the high resolution crystal structure of the I domain from the alpha-subunit of the integrin alpha2beta1, a cell surface adhesion receptor for collagen and the human pathogen echovirus-1. The domain, as expected, adopts the dinucleotide-binding fold, and contains a metal ion-dependent adhesion site motif with bound Mg2+ at the top of the beta-sheet. Comparison with the crystal structures of the leukocyte integrin I domains reveals a new helix (the C-helix) protruding from the metal ion-dependent adhesion site face of the domain which creates a groove centered on the magnesium ion. Modeling of a collagen triple helix into the groove suggests that a glutamic acid side chain from collagen can coordinate the metal ion, and that the C-helix insert is a major determinant of binding specificity. The binding site for echovirus-1 maps to a distinct surface of the alpha2-I domain (one edge of the beta-sheet), consistent with data showing that virus and collagen binding occur by different mechanisms. Comparison with the homologous von Willebrand factor A3 domain, which also binds collagen, suggests that the two domains bind collagen in different ways. Crystal structure of the I domain from integrin alpha2beta1.,Emsley J, King SL, Bergelson JM, Liddington RC J Biol Chem. 1997 Nov 7;272(45):28512-7. PMID:9353312[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences |
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