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[[Image:2be1.gif|left|200px]]<br /><applet load="2be1" size="350" color="white" frame="true" align="right" spinBox="true"
caption="2be1, resolution 2.983&Aring;" />
'''Structure of the compact lumenal domain of yeast Ire1'''<br />


==Overview==
==Structure of the compact lumenal domain of yeast Ire1==
Unfolded proteins in the endoplasmic reticulum (ER) activate the ER transmembrane sensor Ire1 to trigger the unfolded protein response (UPR), a homeostatic signaling pathway that adjusts ER protein folding capacity according to need. Ire1 is a bifunctional enzyme, containing cytoplasmic kinase and RNase domains whose roles in signal transduction downstream of Ire1 are understood in some detail. By contrast, the question of how its ER-luminal domain (LD) senses unfolded proteins has remained an enigma. The 3.0-A crystal structure and consequent structure-guided functional analyses of the conserved core region of the LD (cLD) leads us to a proposal for the mechanism of response. cLD exhibits a unique protein fold and is sufficient to control Ire1 activation by unfolded proteins. Dimerization of cLD monomers across a large interface creates a shared central groove formed by alpha-helices that are situated on a beta-sheet floor. This groove is reminiscent of the peptide binding domains of major histocompatibility complexes (MHCs) in its gross architecture. Conserved amino acid side chains in Ire1 that face into the groove are shown to be important for UPR activation in that their mutation reduces the response. Mutational analyses suggest that further interaction between cLD dimers is required to form higher-order oligomers necessary for UPR activation. We propose that cLD directly binds unfolded proteins, which changes the quaternary association of the monomers in the membrane plane. The changes in the ER lumen in turn position Ire1 kinase domains in the cytoplasm optimally for autophosphorylation to initiate the UPR.
<StructureSection load='2be1' size='340' side='right'caption='[[2be1]], [[Resolution|resolution]] 2.98&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2be1]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2BE1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2BE1 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]] 2.983&#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=2be1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2be1 OCA], [https://pdbe.org/2be1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2be1 RCSB], [https://www.ebi.ac.uk/pdbsum/2be1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2be1 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/IRE1_YEAST IRE1_YEAST] 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 HAC1 precursor mRNA to produce the mature form which then induces transcription of UPR target genes.<ref>PMID:8663458</ref> <ref>PMID:8670804</ref> <ref>PMID:9323131</ref>
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/be/2be1_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</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=2be1 ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
2BE1 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2BE1 OCA].
*[[Ire1|Ire1]]
 
== References ==
==Reference==
<references/>
On the mechanism of sensing unfolded protein in the endoplasmic reticulum., Credle JJ, Finer-Moore JS, Papa FR, Stroud RM, Walter P, Proc Natl Acad Sci U S A. 2005 Dec 27;102(52):18773-84. Epub 2005 Dec 19. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16365312 16365312]
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Single protein]]
[[Category: Credle JJ]]
[[Category: Credle, J J.]]
[[Category: Finer-Moore JS]]
[[Category: Finer-Moore, J S.]]
[[Category: Papa FR]]
[[Category: Papa, F R.]]
[[Category: Stroud RM]]
[[Category: Stroud, R M.]]
[[Category: Walter P]]
[[Category: Walter, P.]]
[[Category: peptide-binding groove peptide-mediated oligomerization beta-propeller]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:36:50 2008''

Latest revision as of 12:17, 14 February 2024

Structure of the compact lumenal domain of yeast Ire1Structure of the compact lumenal domain of yeast Ire1

Structural highlights

2be1 is a 3 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.983Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

IRE1_YEAST 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 HAC1 precursor mRNA to produce the mature form which then induces transcription of UPR target genes.[1] [2] [3]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

References

  1. ↑ Welihinda AA, Kaufman RJ. The unfolded protein response pathway in Saccharomyces cerevisiae. Oligomerization and trans-phosphorylation of Ire1p (Ern1p) are required for kinase activation. J Biol Chem. 1996 Jul 26;271(30):18181-7. PMID:8663458
  2. ↑ Shamu CE, Walter P. Oligomerization and phosphorylation of the Ire1p kinase during intracellular signaling from the endoplasmic reticulum to the nucleus. EMBO J. 1996 Jun 17;15(12):3028-39. PMID:8670804
  3. ↑ Sidrauski C, Walter P. The transmembrane kinase Ire1p is a site-specific endonuclease that initiates mRNA splicing in the unfolded protein response. Cell. 1997 Sep 19;90(6):1031-9. PMID:9323131

2be1, resolution 2.98Å

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