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==Crystal Structure of Leukocyte Ig-like Receptor A5 (LILRA5/LIR9/ILT11)== | |||
<StructureSection load='2d3v' size='340' side='right'caption='[[2d3v]], [[Resolution|resolution]] 1.85Å' scene=''> | |||
| | == Structural highlights == | ||
| | <table><tr><td colspan='2'>[[2d3v]] 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=2D3V OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2D3V 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]] 1.85Å</td></tr> | ||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</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=2d3v FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2d3v OCA], [https://pdbe.org/2d3v PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2d3v RCSB], [https://www.ebi.ac.uk/pdbsum/2d3v PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2d3v ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/LIRA5_HUMAN LIRA5_HUMAN] May play a role in triggering innate immune responses. Does not seem to play a role for any class I MHC antigen recognition.<ref>PMID:16675463</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/d3/2d3v_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=2d3v ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Human leukocyte Ig-like receptor B1 (LILRB1) and B2 (LILRB2) belong to "Group 1" receptors and recognize a broad range of major histocompatibility complex class I molecules (MHCIs). In contrast, "Group 2" receptors show low similarity with LILRB1/B2, and their ligands remain to be identified. To date, the structural and functional characteristics of Group 2 LILRs are poorly understood. Here we report the crystal structure of the extracellular domain of LILRA5, which is an activating Group 2 LILR expressed on monocytes and neutrophils. Unexpectedly, the structure showed large changes in structural conformation and charge distribution in the region corresponding to the MHCI binding site of LILRB1/B2, which are also distinct from killer cell Ig-like receptors and Fc alpha receptors. These changes probably confer the structural hindrance for the MHCI binding, and their key amino acid substitutions are well conserved in Group 2 LILRs. Consistently, the surface plasmon resonance and flow cytometric analyses demonstrated that LILRA5 exhibited no affinities to all tested MHCIs. These results raised the possibility that LILRA5 as well as Group 2 LILRs do not play a role in any MHCI recognition but could possibly bind to non-MHCI ligand(s) on the target cells to provide a novel immune regulation mechanism. | |||
Crystal structure of the human monocyte-activating receptor, "Group 2" leukocyte Ig-like receptor A5 (LILRA5/LIR9/ILT11).,Shiroishi M, Kajikawa M, Kuroki K, Ose T, Kohda D, Maenaka K J Biol Chem. 2006 Jul 14;281(28):19536-44. Epub 2006 May 3. PMID:16675463<ref>PMID:16675463</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 2d3v" style="background-color:#fffaf0;"></div> | |||
== | ==See Also== | ||
*[[Leukocyte immunoglobulin-like receptor|Leukocyte immunoglobulin-like receptor]] | |||
== References == | |||
== | <references/> | ||
__TOC__ | |||
</StructureSection> | |||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Kajikawa | [[Category: Kajikawa M]] | ||
[[Category: Kohda | [[Category: Kohda D]] | ||
[[Category: Kuroki | [[Category: Kuroki K]] | ||
[[Category: Maenaka | [[Category: Maenaka K]] | ||
[[Category: Ose | [[Category: Ose T]] | ||
[[Category: Shiroishi | [[Category: Shiroishi M]] | ||
Latest revision as of 10:54, 30 October 2024
Crystal Structure of Leukocyte Ig-like Receptor A5 (LILRA5/LIR9/ILT11)Crystal Structure of Leukocyte Ig-like Receptor A5 (LILRA5/LIR9/ILT11)
Structural highlights
FunctionLIRA5_HUMAN May play a role in triggering innate immune responses. Does not seem to play a role for any class I MHC antigen recognition.[1] 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 PubMedHuman leukocyte Ig-like receptor B1 (LILRB1) and B2 (LILRB2) belong to "Group 1" receptors and recognize a broad range of major histocompatibility complex class I molecules (MHCIs). In contrast, "Group 2" receptors show low similarity with LILRB1/B2, and their ligands remain to be identified. To date, the structural and functional characteristics of Group 2 LILRs are poorly understood. Here we report the crystal structure of the extracellular domain of LILRA5, which is an activating Group 2 LILR expressed on monocytes and neutrophils. Unexpectedly, the structure showed large changes in structural conformation and charge distribution in the region corresponding to the MHCI binding site of LILRB1/B2, which are also distinct from killer cell Ig-like receptors and Fc alpha receptors. These changes probably confer the structural hindrance for the MHCI binding, and their key amino acid substitutions are well conserved in Group 2 LILRs. Consistently, the surface plasmon resonance and flow cytometric analyses demonstrated that LILRA5 exhibited no affinities to all tested MHCIs. These results raised the possibility that LILRA5 as well as Group 2 LILRs do not play a role in any MHCI recognition but could possibly bind to non-MHCI ligand(s) on the target cells to provide a novel immune regulation mechanism. Crystal structure of the human monocyte-activating receptor, "Group 2" leukocyte Ig-like receptor A5 (LILRA5/LIR9/ILT11).,Shiroishi M, Kajikawa M, Kuroki K, Ose T, Kohda D, Maenaka K J Biol Chem. 2006 Jul 14;281(28):19536-44. Epub 2006 May 3. PMID:16675463[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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