1qwt

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(New page: 200px<br /> <applet load="1qwt" size="450" color="white" frame="true" align="right" spinBox="true" caption="1qwt, resolution 2.1&Aring;" /> '''Auto-inhibitory inte...)
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[[Image:1qwt.gif|left|200px]]<br />
 
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<applet load="1qwt" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1qwt, resolution 2.1&Aring;" />
 
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'''Auto-inhibitory interferon regulation factor-3 (IRF3) transactivation domain'''<br />
 
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==Overview==
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==Auto-inhibitory interferon regulation factor-3 (IRF3) transactivation domain==
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IRF-3, a member of the interferon regulatory factor (IRF) family of, transcription factors, functions as a molecular switch for antiviral, activity. IRF-3 uses an autoinhibitory mechanism to suppress its, transactivation potential in uninfected cells, and virus infection induces, phosphorylation and activation of IRF-3 to initiate the antiviral, responses. The crystal structure of the IRF-3 transactivation domain, reveals a unique autoinhibitory mechanism, whereby the IRF association, domain and the flanking autoinhibitory elements condense to form a, hydrophobic core. The structure suggests that phosphorylation reorganizes, the autoinhibitory elements, leading to unmasking of a hydrophobic active, site and realignment of the DNA binding domain for transcriptional, activation. IRF-3 exhibits marked structural and surface electrostatic, potential similarity to the MH2 domain of the Smad protein family and the, FHA domain, suggesting a common molecular mechanism of action among this, superfamily of signaling mediators.
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<StructureSection load='1qwt' size='340' side='right'caption='[[1qwt]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1qwt]] is a 2 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=1QWT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QWT 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]] 2.1&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></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=1qwt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qwt OCA], [https://pdbe.org/1qwt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qwt RCSB], [https://www.ebi.ac.uk/pdbsum/1qwt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qwt ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/IRF3_HUMAN IRF3_HUMAN] Key transcriptional regulator of type I interferon (IFN)-dependent immune responses and plays a critical role in the innate immune response against DNA and RNA viruses. Regulates the transcription of type I IFN genes (IFN-alpha and IFN-beta) and IFN-stimulated genes (ISG) by binding to an interferon-stimulated response element (ISRE) in their promoters. Acts as a more potent activator of the IFN-beta (IFNB) gene than the IFN-alpha (IFNA) gene and plays a critical role in both the early and late phases of the IFNA/B gene induction. Found in an inactive form in the cytoplasm of uninfected cells and following viral infection, double-stranded RNA (dsRNA), or toll-like receptor (TLR) signaling, becomes phosphorylated by IKBKE and TBK1 kinases. This induces a conformational change, leading to its dimerization and nuclear localization and association with CREB binding protein (CREBBP) to form dsRNA-activated factor 1 (DRAF1), a complex which activates the transcription of the type I IFN and ISG genes. Can activate distinct gene expression programs in macrophages and can induce significant apoptosis in primary macrophages.
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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/qw/1qwt_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1qwt ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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IRF-3, a member of the interferon regulatory factor (IRF) family of transcription factors, functions as a molecular switch for antiviral activity. IRF-3 uses an autoinhibitory mechanism to suppress its transactivation potential in uninfected cells, and virus infection induces phosphorylation and activation of IRF-3 to initiate the antiviral responses. The crystal structure of the IRF-3 transactivation domain reveals a unique autoinhibitory mechanism, whereby the IRF association domain and the flanking autoinhibitory elements condense to form a hydrophobic core. The structure suggests that phosphorylation reorganizes the autoinhibitory elements, leading to unmasking of a hydrophobic active site and realignment of the DNA binding domain for transcriptional activation. IRF-3 exhibits marked structural and surface electrostatic potential similarity to the MH2 domain of the Smad protein family and the FHA domain, suggesting a common molecular mechanism of action among this superfamily of signaling mediators.
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==About this Structure==
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Crystal structure of IRF-3 reveals mechanism of autoinhibition and virus-induced phosphoactivation.,Qin BY, Liu C, Lam SS, Srinath H, Delston R, Correia JJ, Derynck R, Lin K Nat Struct Biol. 2003 Nov;10(11):913-21. Epub 2003 Oct 12. PMID:14555996<ref>PMID:14555996</ref>
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1QWT is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with PO4 as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1QWT OCA].
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==Reference==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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Crystal structure of IRF-3 reveals mechanism of autoinhibition and virus-induced phosphoactivation., Qin BY, Liu C, Lam SS, Srinath H, Delston R, Correia JJ, Derynck R, Lin K, Nat Struct Biol. 2003 Nov;10(11):913-21. Epub 2003 Oct 12. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=14555996 14555996]
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</div>
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[[Category: Homo sapiens]]
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<div class="pdbe-citations 1qwt" style="background-color:#fffaf0;"></div>
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[[Category: Single protein]]
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[[Category: Qin, B.Y.]]
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[[Category: PO4]]
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[[Category: dna binding protein]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 12 18:57:12 2007''
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==See Also==
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*[[Interferon regulatory factor|Interferon regulatory factor]]
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Homo sapiens]]
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[[Category: Large Structures]]
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[[Category: Qin BY]]

Current revision

Auto-inhibitory interferon regulation factor-3 (IRF3) transactivation domain

PDB ID 1qwt

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