1irf

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[[Image:1irf.gif|left|200px]]
 
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{{Structure
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==INTERFERON REGULATORY FACTOR-2 DNA BINDING DOMAIN, NMR, MINIMIZED AVERAGE STRUCTURE==
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|PDB= 1irf |SIZE=350|CAPTION= <scene name='initialview01'>1irf</scene>
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<StructureSection load='1irf' size='340' side='right'caption='[[1irf]]' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND=
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<table><tr><td colspan='2'>[[1irf]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IRF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1IRF FirstGlance]. <br>
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|ACTIVITY=
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr>
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|GENE= POTENTIAL ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 Mus musculus])
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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=1irf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1irf OCA], [https://pdbe.org/1irf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1irf RCSB], [https://www.ebi.ac.uk/pdbsum/1irf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1irf ProSAT]</span></td></tr>
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|DOMAIN=
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</table>
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|RELATEDENTRY=[[1irg|1IRG]]
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== Function ==
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1irf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1irf OCA], [http://www.ebi.ac.uk/pdbsum/1irf PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1irf RCSB]</span>
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[https://www.uniprot.org/uniprot/IRF2_MOUSE IRF2_MOUSE] Specifically binds to the upstream regulatory region of type I IFN and IFN-inducible MHC class I genes (the interferon consensus sequence (ICS)) and represses those genes. Also acts as an activator for several genes including H4 and IL7. Constitutively binds to the ISRE promoter to activate IL7. Involved in cell cycle regulation through binding the site II (HiNF-M) promoter region of H4 and activating transcription during cell growth. Antagonizes IRF1 transcriptional activation.
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}}
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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/ir/1irf_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=1irf ConSurf].
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<div style="clear:both"></div>
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'''INTERFERON REGULATORY FACTOR-2 DNA BINDING DOMAIN, NMR, MINIMIZED AVERAGE STRUCTURE'''
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==See Also==
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*[[Interferon regulatory factor|Interferon regulatory factor]]
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__TOC__
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==Overview==
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</StructureSection>
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BACKGROUND: The transcription of interferon (IFN) and IFN-inducible genes is mainly regulated by the interferon regulatory factor (IRF) family of proteins, which recognize a unique AAGTGA hexamer repeat motif in the regulatory region of IFN genes. A DNA-binding domain of approximately 100 amino acids has been commonly found in the IRF family of proteins, but it has no sequence homology to known DNA-binding motifs. Elucidation of the structures of members of the IRF family is therefore useful to the understanding of the regulation and evolution of the immune system at the structural level. RESULTS: The solution structure of the DNA-binding domain of interferon regulatory factor-2 (IRF-2) has been determined by NMR spectroscopy. It is composed of a four-stranded antiparallel beta sheet and three alpha helices, and its global fold is similar to those of the winged helix-turn-helix (wHTH) family of proteins. A long loop (Pro37-Asp51) is found immediately before the HTH motif, which is not found in other wHTH proteins. The NMR signals of residues in this long loop, as well as the second helix of the HTH motif, are strongly affected upon the addition of the hexamer repeat DNA, suggesting that these structural elements participate in DNA recognition and binding. CONCLUSIONS: The structural similarity of the DNA-binding domain of IRF-2 with those of proteins in the wHTH family shows that the IRF proteins belong to the wHTH family, even though there is no apparent sequence homology among proteins of the two families. The sequential structure alignment program (SSAP) shows that IRF-2 has a slightly different structure from typical wHTH proteins, mainly in the orientation of helix 2. The IRF family of proteins should therefore be categorized into a subfamily of the wHTH family. The evidence here implies that the evolutional pathway of the IRF family is distinct from that of the other wHTH proteins, in other words, the immune system diverged from an evolutional stem at an early stage.
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[[Category: Large Structures]]
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==About this Structure==
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1IRF is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IRF OCA].
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==Reference==
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Solution structure of the IRF-2 DNA-binding domain: a novel subgroup of the winged helix-turn-helix family., Furui J, Uegaki K, Yamazaki T, Shirakawa M, Swindells MB, Harada H, Taniguchi T, Kyogoku Y, Structure. 1998 Apr 15;6(4):491-500. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9562558 9562558]
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[[Category: Mus musculus]]
[[Category: Mus musculus]]
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[[Category: Single protein]]
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[[Category: Furui J]]
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[[Category: Furui, J.]]
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[[Category: Harada H]]
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[[Category: Harada, H.]]
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[[Category: Kyogoku Y]]
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[[Category: Kyogoku, Y.]]
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[[Category: Shirakawa M]]
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[[Category: Shirakawa, M.]]
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[[Category: Swindells MB]]
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[[Category: Swindells, M B.]]
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[[Category: Taniguchi T]]
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[[Category: Taniguchi, T.]]
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[[Category: Uegaki K]]
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[[Category: Uegaki, K.]]
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[[Category: Yamazaki T]]
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[[Category: Yamazaki, T.]]
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[[Category: transcription regulation]]
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[[Category: winged helix-turn-helix]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:23:35 2008''
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Current revision

INTERFERON REGULATORY FACTOR-2 DNA BINDING DOMAIN, NMR, MINIMIZED AVERAGE STRUCTURE

PDB ID 1irf

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