3lb6

<StructureSection load='3lb6' size='340' side='right' caption='[[3lb6]], [[Resolution|resolution]] 3.05&Aring;' scene=''>

<table><tr><td colspan='2'>[[3lb6]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3LB6 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3LB6 FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>

<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MLY:N-DIMETHYL-LYSINE'>MLY</scene></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">IL13, NC30 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3lb6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3lb6 OCA], [http://pdbe.org/3lb6 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3lb6 RCSB], [http://www.ebi.ac.uk/pdbsum/3lb6 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3lb6 ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/IL13_HUMAN IL13_HUMAN]] Defects in IL13 may be a cause of susceptibility to allergic rhinitis (ALRH) [MIM:[http://omim.org/entry/607154 607154]]. Allergic rhinitis is a common disease of complex inheritance and is characterized by mucosal inflammation caused by allergen exposure.

[[http://www.uniprot.org/uniprot/I13R2_HUMAN I13R2_HUMAN]] Binds as a monomer with high affinity to interleukin-13 (IL13), but not to interleukin-4 (IL4).<ref>PMID:20223216</ref> [[http://www.uniprot.org/uniprot/IL13_HUMAN IL13_HUMAN]] Cytokine. Inhibits inflammatory cytokine production. Synergizes with IL2 in regulating interferon-gamma synthesis. May be critical in regulating inflammatory and immune responses.

<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/lb/3lb6_consurf.spt"</scriptWhenChecked>

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== Publication Abstract from PubMed ==

Interleukin-13 is a cytokine important for development of T helper cell type 2 (Th2) responses and plays a critical role in asthma and allergy. The IL-13 Receptor alpha2 (IL-13Ralpha2) is a receptor for IL-13 lacking canonical Jak/STAT signaling functions. Here we present the crystal structure along with a mutational and biophysical analysis of the IL-13/IL-13Ralpha2 complex. While retaining a similar mode of IL-13 binding to its related signaling receptor, IL-13Ralpha1, IL-13Ralpha2 uses peripheral receptor residues unused in the IL-13/IL-13Ralpha1 complex to generate a larger and more complementary interface for IL-13. This results in a four orders of magnitude increase in affinity, to the femtomolar level, compared to IL-13Ralpha1. Alanine scanning mutagenesis of the IL-13 interface reveals several common "hotspot" residues important for binding to both receptors, but also identifies a prominent IL-13Ralpha2-specific contact. These results provide a framework for development of receptor subtype-selective IL-13 antagonists and indicate a decoy function for IL-13Ralpha2.

Molecular basis for shared cytokine recognition revealed in the structure of an unusually high affinity complex between IL-13 and IL-13Ralpha2.,Lupardus PJ, Birnbaum ME, Garcia KC Structure. 2010 Mar 10;18(3):332-42. PMID:20223216<ref>PMID:20223216</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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<div class="pdbe-citations 3lb6" style="background-color:#fffaf0;"></div>

*[[Interleukin|Interleukin]]

*[[Interleukin receptor|Interleukin receptor]]

[[Category: Human]]

[[Category: Birnbaum, M E]]

[[Category: Garcia, K C]]

[[Category: Lupardus, P J]]

[[Category: Cytokine]]

[[Category: Signaling protein-signaling protein complex]]