View source for 1iie


==HLA-DR ANTIGENS ASSOCIATED INVARIANT CHAIN==
<StructureSection load='1iie' size='340' side='right' caption='[[1iie]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1iie]] is a 3 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IIE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1IIE FirstGlance]. <br>
</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=1iie FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1iie OCA], [http://pdbe.org/1iie PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1iie RCSB], [http://www.ebi.ac.uk/pdbsum/1iie PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1iie ProSAT]</span></td></tr>
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== Disease ==
[[http://www.uniprot.org/uniprot/HG2A_HUMAN HG2A_HUMAN]] Note=A chromosomal aberration involving CD74 is found in a non-small cell lung tumor. Results in the formation of a CD74-ROS1 chimeric protein.<ref>PMID:12661006</ref>  
== Function ==
[[http://www.uniprot.org/uniprot/HG2A_HUMAN HG2A_HUMAN]] Plays a critical role in MHC class II antigen processing by stabilizing peptide-free class II alpha/beta heterodimers in a complex soon after their synthesis and directing transport of the complex from the endoplasmic reticulum to the endosomal/lysosomal system where the antigen processing and binding of antigenic peptides to MHC class II takes place. Serves as cell surface receptor for the cytokine MIF. 
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== Publication Abstract from PubMed ==
The invariant chain (Ii) plays a critical role in MHC class II antigen processing by stabilizing peptide-free class II alphabeta heterodimers in a nonameric (alphabetaIi)3 complex soon after their synthesis and directing transport of the complex from the endoplasmic reticulum to compartments where peptide loading of class II takes place. Loading progresses following Ii proteolysis and via an intermediate complex of MHC class II with an Ii-derived peptide, CLIP. CLIP is substituted by exogenous peptidic fragments in an exchange reaction catalyzed by HLA-DM. The CLIP region of Ii, roughly residues 81-104, is one of two segments shown to interact with class II HLA-DR molecules. The other segment, Ii 118-216, is C-terminal to CLIP, mediates trimerization of the ectodomain of Ii and interferes with DM/class II binding. Here we report the three-dimensional structure of this trimeric domain, determined by nuclear magnetic resonance (NMR) studies of a 27 kDa trimer of human Ii 118-192. The cylindrical shape of the molecule and the mapping of conserved residues delimit surfaces which may be important for interactions between Ii and class II molecules.

Structure of a trimeric domain of the MHC class II-associated chaperonin and targeting protein Ii.,Jasanoff A, Wagner G, Wiley DC EMBO J. 1998 Dec 1;17(23):6812-8. PMID:9843486<ref>PMID:9843486</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
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</StructureSection>
[[Category: Jasanoff, A]]
[[Category: Wagner, G]]
[[Category: Wiley, D C]]
[[Category: Antigen processing]]
[[Category: Chaperonin]]
[[Category: Major histocompatibility complex]]
[[Category: Oligomerization]]