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2hz6

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[[Image:2hz6.gif|left|200px]]<br /><applet load="2hz6" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="2hz6, resolution 3.10&Aring;" />
 
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'''The crystal structure of human IRE1-alpha luminal domain'''<br />
 
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==Overview==
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==The crystal structure of human IRE1-alpha luminal domain==
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The unfolded protein response (UPR) is an evolutionarily conserved mechanism by which all eukaryotic cells adapt to the accumulation of unfolded proteins in the endoplasmic reticulum (ER). Inositol-requiring kinase 1 (IRE1) and PKR-related ER kinase (PERK) are two type I transmembrane ER-localized protein kinase receptors that signal the UPR through a process that involves homodimerization and autophosphorylation. To elucidate the molecular basis of the ER transmembrane signaling event, we determined the x-ray crystal structure of the luminal domain of human IRE1alpha. The monomer of the luminal domain comprises a unique fold of a triangular assembly of beta-sheet clusters. Structural analysis identified an extensive dimerization interface stabilized by hydrogen bonds and hydrophobic interactions. Dimerization creates an MHC-like groove at the interface. However, because this groove is too narrow for peptide binding and the purified luminal domain forms high-affinity dimers in vitro, peptide binding to this groove is not required for dimerization. Consistent with our structural observations, mutations that disrupt the dimerization interface produced IRE1alpha molecules that failed to either dimerize or activate the UPR upon ER stress. In addition, mutations in a structurally homologous region within PERK also prevented dimerization. Our structural, biochemical, and functional studies in vivo altogether demonstrate that IRE1 and PERK have conserved a common molecular interface necessary and sufficient for dimerization and UPR signaling.
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<StructureSection load='2hz6' size='340' side='right'caption='[[2hz6]], [[Resolution|resolution]] 3.10&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[2hz6]] 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=2HZ6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2HZ6 FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.1&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2hz6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2hz6 OCA], [https://pdbe.org/2hz6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2hz6 RCSB], [https://www.ebi.ac.uk/pdbsum/2hz6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2hz6 ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/ERN1_HUMAN ERN1_HUMAN] Senses unfolded proteins in the lumen of the endoplasmic reticulum via its N-terminal domain which leads to enzyme auto-activation. The active endoribonuclease domain splices XBP1 mRNA to generate a new C-terminus, converting it into a potent unfolded-protein response transcriptional activator and triggering growth arrest and apoptosis.<ref>PMID:9637683</ref> <ref>PMID:11175748</ref> <ref>PMID:12637535</ref> [UniProtKB:Q9EQY0]
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/hz/2hz6_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=2hz6 ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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2HZ6 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2HZ6 OCA].
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*[[Ire1|Ire1]]
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== References ==
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==Reference==
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<references/>
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The crystal structure of human IRE1 luminal domain reveals a conserved dimerization interface required for activation of the unfolded protein response., Zhou J, Liu CY, Back SH, Clark RL, Peisach D, Xu Z, Kaufman RJ, Proc Natl Acad Sci U S A. 2006 Sep 26;103(39):14343-8. Epub 2006 Sep 14. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16973740 16973740]
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Kaufman, R J.]]
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[[Category: Kaufman RJ]]
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[[Category: Xu, Z.]]
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[[Category: Xu Z]]
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[[Category: Zhou, J.]]
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[[Category: Zhou J]]
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[[Category: triangular beta-sheet cluster]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:47:22 2008''
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Current revision

The crystal structure of human IRE1-alpha luminal domain

PDB ID 2hz6

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