View source for 4gs7


==Structure of the Interleukin-15 quaternary complex==
<StructureSection load='4gs7' size='340' side='right'caption='[[4gs7]], [[Resolution|resolution]] 2.35&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4gs7]] is a 4 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=4GS7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4GS7 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=MLY:N-DIMETHYL-LYSINE'>MLY</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</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=4gs7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4gs7 OCA], [https://pdbe.org/4gs7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4gs7 RCSB], [https://www.ebi.ac.uk/pdbsum/4gs7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4gs7 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/IL15_HUMAN IL15_HUMAN] Cytokine that stimulates the proliferation of T-lymphocytes. Stimulation by IL-15 requires interaction of IL-15 with components of IL-2R, including IL-2R beta and probably IL-2R gamma but not IL-2R alpha.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Interleukin 15 (IL-15) and IL-2 have distinct immunological functions even though both signal through the receptor subunit IL-2Rbeta and the common gamma-chain (gamma(c)). Here we found that in the structure of the IL-15-IL-15Ralpha-IL-2Rbeta-gamma(c) quaternary complex, IL-15 binds to IL-2Rbeta and gamma(c) in a heterodimer nearly indistinguishable from that of the IL-2-IL-2Ralpha-IL-2Rbeta-gamma(c) complex, despite their different receptor-binding chemistries. IL-15Ralpha substantially increased the affinity of IL-15 for IL-2Rbeta, and this allostery was required for IL-15 trans signaling. Consistent with their identical IL-2Rbeta-gamma(c) dimer geometries, IL-2 and IL-15 showed similar signaling properties in lymphocytes, with any differences resulting from disparate receptor affinities. Thus, IL-15 and IL-2 induced similar signals, and the cytokine specificity of IL-2Ralpha versus IL-15Ralpha determined cellular responsiveness. Our results provide new insights for the development of specific immunotherapeutics based on IL-15 or IL-2.

Mechanistic and structural insight into the functional dichotomy between IL-2 and IL-15.,Ring AM, Lin JX, Feng D, Mitra S, Rickert M, Bowman GR, Pande VS, Li P, Moraga I, Spolski R, Ozkan E, Leonard WJ, Garcia KC Nat Immunol. 2012 Oct 28. doi: 10.1038/ni.2449. PMID:23104097<ref>PMID:23104097</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4gs7" style="background-color:#fffaf0;"></div>

==See Also==
*[[Interleukin 3D structures|Interleukin 3D structures]]
*[[Interleukin receptor 3D structures|Interleukin receptor 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Feng D]]
[[Category: Garcia KC]]
[[Category: Ozkan E]]
[[Category: Ring AM]]