1mqa

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[[Image:1mqa.jpg|left|200px]]<br /><applet load="1mqa" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1mqa, resolution 2.50&Aring;" />
 
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'''Crystal structure of high affinity alphaL I domain in the absence of ligand or metal'''<br />
 
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==Overview==
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==Crystal structure of high affinity alphaL I domain in the absence of ligand or metal==
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The structure of the I domain of integrin alpha L beta 2 bound to the Ig, superfamily ligand ICAM-1 reveals the open ligand binding conformation and, the first example of an integrin-IgSF interface. The I domain Mg2+, directly coordinates Glu-34 of ICAM-1, and a dramatic swing of I domain, residue Glu-241 enables a critical salt bridge. Liganded and unliganded, structures for both high- and intermediate-affinity mutant I domains, reveal that ligand binding can induce conformational change in the alpha L, I domain and that allosteric signals can convert the closed conformation, to intermediate or open conformations without ligand binding. Pulling down, on the C-terminal alpha 7 helix with introduced disulfide bonds ratchets, the beta 6-alpha 7 loop into three different positions in the closed, intermediate, and open conformations, with a progressive increase in, affinity.
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<StructureSection load='1mqa' size='340' side='right'caption='[[1mqa]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1mqa]] is a 1 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=1MQA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MQA FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.5&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1mqa FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mqa OCA], [https://pdbe.org/1mqa PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mqa RCSB], [https://www.ebi.ac.uk/pdbsum/1mqa PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mqa ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/ITAL_HUMAN ITAL_HUMAN] Integrin alpha-L/beta-2 is a receptor for ICAM1, ICAM2, ICAM3 and ICAM4. It is involved in a variety of immune phenomena including leukocyte-endothelial cell interaction, cytotoxic T-cell mediated killing, and antibody dependent killing by granulocytes and monocytes.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/mq/1mqa_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=1mqa ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The structure of the I domain of integrin alpha L beta 2 bound to the Ig superfamily ligand ICAM-1 reveals the open ligand binding conformation and the first example of an integrin-IgSF interface. The I domain Mg2+ directly coordinates Glu-34 of ICAM-1, and a dramatic swing of I domain residue Glu-241 enables a critical salt bridge. Liganded and unliganded structures for both high- and intermediate-affinity mutant I domains reveal that ligand binding can induce conformational change in the alpha L I domain and that allosteric signals can convert the closed conformation to intermediate or open conformations without ligand binding. Pulling down on the C-terminal alpha 7 helix with introduced disulfide bonds ratchets the beta 6-alpha 7 loop into three different positions in the closed, intermediate, and open conformations, with a progressive increase in affinity.
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==About this Structure==
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Structures of the alpha L I domain and its complex with ICAM-1 reveal a shape-shifting pathway for integrin regulation.,Shimaoka M, Xiao T, Liu JH, Yang Y, Dong Y, Jun CD, McCormack A, Zhang R, Joachimiak A, Takagi J, Wang JH, Springer TA Cell. 2003 Jan 10;112(1):99-111. PMID:12526797<ref>PMID:12526797</ref>
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1MQA is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MQA OCA].
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==Reference==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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Structures of the alpha L I domain and its complex with ICAM-1 reveal a shape-shifting pathway for integrin regulation., Shimaoka M, Xiao T, Liu JH, Yang Y, Dong Y, Jun CD, McCormack A, Zhang R, Joachimiak A, Takagi J, Wang JH, Springer TA, Cell. 2003 Jan 10;112(1):99-111. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12526797 12526797]
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</div>
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[[Category: Homo sapiens]]
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<div class="pdbe-citations 1mqa" style="background-color:#fffaf0;"></div>
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[[Category: Single protein]]
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[[Category: Dong, Y.]]
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[[Category: Jun, C.D.]]
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[[Category: Liu, J.H.]]
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[[Category: Shimaoka, T.]]
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[[Category: Springer, T.A.]]
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[[Category: Takagi, J.]]
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[[Category: Wang, J.H.]]
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[[Category: Xiao, T.]]
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[[Category: Yang, Y.]]
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[[Category: Zhang, R.]]
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[[Category: designed disulfide bridge]]
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[[Category: rossmann fold]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri Feb 15 16:25:28 2008''
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==See Also==
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*[[Integrin 3D structures|Integrin 3D structures]]
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Homo sapiens]]
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[[Category: Large Structures]]
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[[Category: Dong Y]]
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[[Category: Jun C-D]]
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[[Category: Liu J-H]]
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[[Category: Shimaoka T]]
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[[Category: Springer TA]]
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[[Category: Takagi J]]
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[[Category: Wang J-H]]
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[[Category: Xiao T]]
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[[Category: Yang Y]]
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[[Category: Zhang R]]

Current revision

Crystal structure of high affinity alphaL I domain in the absence of ligand or metal

PDB ID 1mqa

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