1nwq
From Proteopedia
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| - | [[Image:1nwq.gif|left|200px]] | ||
| - | + | ==CRYSTAL STRUCTURE OF C/EBPALPHA-DNA COMPLEX== | |
| - | + | <StructureSection load='1nwq' size='340' side='right'caption='[[1nwq]], [[Resolution|resolution]] 2.80Å' scene=''> | |
| - | + | == Structural highlights == | |
| - | + | <table><tr><td colspan='2'>[[1nwq]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NWQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1NWQ 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]] 2.8Å</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=1nwq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1nwq OCA], [https://pdbe.org/1nwq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1nwq RCSB], [https://www.ebi.ac.uk/pdbsum/1nwq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1nwq ProSAT]</span></td></tr> |
| - | + | </table> | |
| + | == Function == | ||
| + | [https://www.uniprot.org/uniprot/CEBPA_RAT CEBPA_RAT] C/EBP is a DNA-binding protein that recognizes two different motifs: the CCAAT homology common to many promoters and the enhanced core homology common to many enhancers. | ||
| + | == 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/nw/1nwq_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=1nwq ConSurf]. | ||
| + | <div style="clear:both"></div> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | CCAAT/enhancer-binding proteins (C/EBPs) are basic region leucine zipper (bZIP) transcription factors that regulate cell differentiation, growth, survival, and inflammation. To understand the molecular basis of DNA recognition by the C/EBP family we determined the x-ray structure of a C/EBPalpha bZIP polypeptide bound to its cognate DNA site (A(-5)T(-4)T(-3)G(-2)C(-1)G(1)C(2)A(3)A(4)T(5)) and characterized several basic region mutants. Binding specificity is provided by interactions of basic region residues Arg(289), Asn(292), Ala(295), Val(296), Ser(299), and Arg(300) with DNA bases. A striking feature of the C/EBPalpha protein-DNA interface that distinguishes it from known bZIP-DNA complexes is the central role of Arg(289), which is hydrogen-bonded to base A(3), phosphate, Asn(292) (invariant in bZIPs), and Asn(293). The conformation of Arg(289) is also restricted by Tyr(285). In accordance with the structural model, mutation of Arg(289) or a pair of its interacting partners (Tyr(285) and Asn(293)) abolished C/EBPalpha binding activity. Val(296) (Ala in most other bZIPs) contributes to C/EBPalpha specificity by discriminating against purines at position -3 and imposing steric restraints on the invariant Arg(300). Mutating Val(296) to Ala strongly enhanced C/EBPalpha binding to cAMP response element (CRE) sites while retaining affinity for C/EBP sites. Thus, Arg(289) is essential for formation of the complementary protein-DNA interface, whereas Val(296) functions primarily to restrict interactions with related sequences such as CRE sites rather than specifying binding to C/EBP sites. Our studies also help to explain the phenotypes of mice carrying targeted mutations in the C/EBPalpha bZIP region. | ||
| - | + | Structural basis for DNA recognition by the basic region leucine zipper transcription factor CCAAT/enhancer-binding protein alpha.,Miller M, Shuman JD, Sebastian T, Dauter Z, Johnson PF J Biol Chem. 2003 Apr 25;278(17):15178-84. Epub 2003 Feb 10. PMID:12578822<ref>PMID:12578822</ref> | |
| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
| + | <div class="pdbe-citations 1nwq" style="background-color:#fffaf0;"></div> | ||
| - | == | + | ==See Also== |
| - | + | *[[Tomato aspermy virus protein 2b Suppression of RNA Silencing|Tomato aspermy virus protein 2b Suppression of RNA Silencing]] | |
| - | + | == References == | |
| - | == | + | <references/> |
| - | + | __TOC__ | |
| - | + | </StructureSection> | |
| - | + | [[Category: Large Structures]] | |
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[[Category: Rattus norvegicus]] | [[Category: Rattus norvegicus]] | ||
| - | + | [[Category: Dauter Z]] | |
| - | [[Category: Dauter | + | [[Category: Johnson PF]] |
| - | [[Category: Johnson | + | [[Category: Miller M]] |
| - | [[Category: Miller | + | [[Category: Sebastian T]] |
| - | [[Category: Sebastian | + | [[Category: Shuman JD]] |
| - | [[Category: Shuman | + | |
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Current revision
CRYSTAL STRUCTURE OF C/EBPALPHA-DNA COMPLEX
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