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[[Image:1lek.jpg|left|200px]]<br /><applet load="1lek" size="350" color="white" frame="true" align="right" spinBox="true"
caption="1lek, resolution 2.15&Aring;" />
'''Crystal Structure of H-2Kbm3 bound to dEV8'''<br />


==Overview==
==Crystal Structure of H-2Kbm3 bound to dEV8==
The crystal structures of the 2C/H-2K(bm3)-dEV8 allogeneic complex at 2.4 A and H-2K(bm3)-dEV8 at 2.15 A, when compared with their syngeneic counterparts, elucidate structural changes that induce an alloresponse. The Asp77Ser mutation that imbues H-2K(bm3)-dEV8 with its alloreactive properties is located beneath the peptide and does not directly contact the T cell receptor (TCR). However, the buried mutation induces local rearrangement of the peptide itself to preserve hydrogen bonding interactions between the peptide and the alpha(1) 77 residue. The COOH terminus of the peptide main chain is tugged toward the alpha(1)-helix such that its presentation to the TCR is altered. These changes increase the stability of the allogeneic peptide-major histocompatibility complex (pMHC) complex and increase complementarity in the TCR-pMHC interface, placing greater emphasis on recognition of the pMHC by the TCR beta-chain, evinced by an increase in shape complementarity, buried surface area, and number of TCR-pMHC contacting residues. A nearly fourfold increase in the number of beta-chain-pMHC contacts is accompanied by a concomitant 64% increase in beta-chain-pMHC shape complementarity. Thus, the allogeneic mutation causes the same peptide to be presented differently, temporally and spatially, by the allogeneic and syngeneic MHCs.
<StructureSection load='1lek' size='340' side='right'caption='[[1lek]], [[Resolution|resolution]] 2.15&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1lek]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LEK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1LEK 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]] 2.15&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CSO:S-HYDROXYCYSTEINE'>CSO</scene>, <scene name='pdbligand=FUC:ALPHA-L-FUCOSE'>FUC</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</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=1lek FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1lek OCA], [https://pdbe.org/1lek PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1lek RCSB], [https://www.ebi.ac.uk/pdbsum/1lek PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1lek ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/HA1B_MOUSE HA1B_MOUSE] Involved in the presentation of foreign antigens to the immune system.
== 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/le/1lek_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=1lek ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1LEK is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus] with <scene name='pdbligand=NAG:'>NAG</scene> and <scene name='pdbligand=PO4:'>PO4</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LEK OCA].
*[[Beta-2 microglobulin 3D structures|Beta-2 microglobulin 3D structures]]
 
*[[MHC 3D structures|MHC 3D structures]]
==Reference==
*[[MHC I 3D structures|MHC I 3D structures]]
Structural comparison of allogeneic and syngeneic T cell receptor-peptide-major histocompatibility complex complexes: a buried alloreactive mutation subtly alters peptide presentation substantially increasing V(beta) Interactions., Luz JG, Huang M, Garcia KC, Rudolph MG, Apostolopoulos V, Teyton L, Wilson IA, J Exp Med. 2002 May 6;195(9):1175-86. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11994422 11994422]
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Mus musculus]]
[[Category: Protein complex]]
[[Category: Apostolopoulos V]]
[[Category: Apostolopoulos, V.]]
[[Category: Garcia KC]]
[[Category: Garcia, K C.]]
[[Category: Huang M]]
[[Category: Huang, M.]]
[[Category: Luz JG]]
[[Category: Luz, J G.]]
[[Category: Rudolph MG]]
[[Category: Rudolph, M G.]]
[[Category: Teyton L]]
[[Category: Teyton, L.]]
[[Category: Wilson IA]]
[[Category: Wilson, I A.]]
[[Category: NAG]]
[[Category: PO4]]
[[Category: mhc class i allogeneic complex with peptide]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:44:21 2008''
Retrieved from "https://proteopedia.org/1lek"