View source for 3q2c


==Binding properties to HLA class I molecules and the structure of the leukocyte Ig-like receptor A3 (LILRA3/ILT6/LIR4/CD85e)==
<StructureSection load='3q2c' size='340' side='right'caption='[[3q2c]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3q2c]] 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=3Q2C OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3Q2C 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]] 2.5&#8491;</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=3q2c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3q2c OCA], [https://pdbe.org/3q2c PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3q2c RCSB], [https://www.ebi.ac.uk/pdbsum/3q2c PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3q2c ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/LIRA3_HUMAN LIRA3_HUMAN] Acts as soluble receptor for class I MHC antigens. Binds both classical and non-classical HLA class I molecules but with reduced affinities compared to LILRB1 or LILRB2. Binds with high affinity to the surface of monocytes, leading to abolish LPS-induced TNF-alpha production by monocytes.<ref>PMID:21559424</ref> <ref>PMID:24085305</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Structurally, Group 1 LILR (Leukocyte Immunoglobulin (Ig)-Like Receptor, also known as Ig-like transcripts, ILT; Leukocyte Ig-like receptor, LIR; and CD85) members are very similar in terms of the HLAIs (human leukocyte antigen class I molecules) binding region and were hypothesized that they all bind to HLAIs. As one of the Group 1 LILRs, LILRA3 is the only secretory LILR and may greatly control the inhibitory immune response induced by LILRB1, LILRB2, and other HLA-binding LILR molecules like LILRA1. Nevertheless, little was known about the binding of LILRA3 to HLAIs. In this report, we present the crystal structure of the LILRA3 domain 1 (D1) and evaluate the D1 and D1D2 (domain 1 and domain 2) binding to classical and non-classical HLAIs using BIAcore(R) surface plasmon resonance analysis (SPR). We found that LILRA3 binds both classical HLA-A*0201 and non-classical HLA-G1 but with reduced affinities compared to either LILRB1 or LILRB2. The polymorphic amino acids and the LILRA3 D1 structure support this notion.

LILRA3 binds both classical and non-classical HLA class I molecules but with reduced affinities compared to LILRB1/LILRB2: structural evidence.,Ryu M, Chen Y, Qi J, Liu J, Fan Z, Nam G, Shi Y, Cheng H, Gao GF PLoS One. 2011 Apr 29;6(4):e19245. PMID:21559424<ref>PMID:21559424</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3q2c" style="background-color:#fffaf0;"></div>

==See Also==
*[[Leukocyte immunoglobulin-like receptor|Leukocyte immunoglobulin-like receptor]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Chen Y]]
[[Category: Cheng H]]
[[Category: Gao GF]]
[[Category: Liu J]]
[[Category: Qi JX]]
[[Category: Ryu M]]
[[Category: Shi Y]]