View source for 3znf


==HIGH-RESOLUTION THREE-DIMENSIONAL STRUCTURE OF A SINGLE ZINC FINGER FROM A HUMAN ENHANCER BINDING PROTEIN IN SOLUTION==
<StructureSection load='3znf' size='340' side='right'caption='[[3znf]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3znf]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3ZNF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3ZNF FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></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=3znf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3znf OCA], [https://pdbe.org/3znf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3znf RCSB], [https://www.ebi.ac.uk/pdbsum/3znf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3znf ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ZEP1_HUMAN ZEP1_HUMAN] This protein specifically binds to the DNA sequence 5'-GGGACTTTCC-3' which is found in the enhancer elements of numerous viral promoters such as those of SV40, CMV, or HIV-1. In addition, related sequences are found in the enhancer elements of a number of cellular promoters, including those of the class I MHC, interleukin-2 receptor, and interferon-beta genes. It may act in T-cell activation. Involved in activating HIV-1 gene expression. Isoform 2 and isoform 3 also bind to the IPCS (IRF1 and p53 common sequence) DNA sequence in the promoter region of interferon regulatory factor 1 and p53 genes and are involved in transcription regulation of these genes. Isoform 2 does not activate HIV-1 gene expression. Isoform 2 and isoform 3 may be involved in apoptosis.[:]<ref>PMID:1727488</ref> <ref>PMID:8289330</ref> <ref>PMID:11818340</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/zn/3znf_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=3znf ConSurf].
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== Publication Abstract from PubMed ==
The three-dimensional structure of a 30-residue synthetic peptide containing the carboxy-terminal "zinc finger" motif of a human enhancer binding protein has been determined by two-dimensional nuclear magnetic resonance (2D NMR) spectroscopy and hybrid distance geometry-dynamical simulated annealing calculations. The structure determination is based on 487 approximate interproton distance and 63 torsion angle (phi, psi, and chi 1) restraints. A total of 40 simulated annealing structures were calculated, and the atomic rms distribution about the mean coordinate positions (excluding residues 29 and 30 which are ill-defined) is 0.4 A for the backbone atoms, 0.8 A for all atoms, and 0.41 A for all atoms excluding the lysine and arginine side chains, which are disordered. The solution structure of the zinc finger consists of two irregular antiparallel beta-strands connected by an atypical turn (residues 3-12) and a classical alpha-helix (residues 14-24). The zinc is tetrahedrally coordinated to the sulfur atoms of two cysteines (Cys-5 and Cys-8) and to the N epsilon 2 atoms of two histidines (His-21 and His-27). The two cysteine residues are located in the turn connecting the two beta-strands (residues 5-8); one of the histidine ligands (His-21) is in the alpha-helix, while the second histidine (His-27) is at the end of a looplike structure (formed by the end of the alpha-helix and a turn). The general architecture is qualitatively similar to two previously determined low-resolution Cys2-His2 zinc finger structures, although distinct differences can be observed in the beta-strands and turn and in the region around the two histidines coordinated to zinc. Comparison of the overall polypeptide fold of the enhancer binding protein zinc finger with known structures in the crystallographic data base reveals a striking similarity to one region (residues 23-44) of the X-ray structure of proteinase inhibitor domain III of Japanese quail ovomucoid [Papamokos, E., Weber, E., Bode, W., Huber, R., Empie, M. W., Kato, I., &amp; Laskowski, M. (1982) J. Mol. Biol. 158, 515-537], which could be superimposed with a backbone atomic rms difference of 0.95 A on residues 3-25 (excluding residue 6) of the zinc finger from the enhancer binding protein. The presence of structural homology between two proteins of very different function may indicate that the so-called zinc finger motif is not unique for a class of DNA binding proteins but may represent a general folding motif found in a variety of proteins irrespective of their function.

High-resolution three-dimensional structure of a single zinc finger from a human enhancer binding protein in solution.,Omichinski JG, Clore GM, Appella E, Sakaguchi K, Gronenborn AM Biochemistry. 1990 Oct 9;29(40):9324-34. PMID:2248949<ref>PMID:2248949</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3znf" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Clore GM]]
[[Category: Gronenborn AM]]
[[Category: Omichinski JG]]