View source for 1vtn


==CO-CRYSTAL STRUCTURE OF THE HNF-3/FORK HEAD DNA-RECOGNITION MOTIF RESEMBLES HISTONE H5==
<StructureSection load='1vtn' size='340' side='right'caption='[[1vtn]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1vtn]] is a 3 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=1VTN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1VTN 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]] 2.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=1vtn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1vtn OCA], [https://pdbe.org/1vtn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1vtn RCSB], [https://www.ebi.ac.uk/pdbsum/1vtn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1vtn ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/FOXA3_HUMAN FOXA3_HUMAN] Transcription factor that is thought to act as a 'pioneer' factor opening the compacted chromatin for other proteins through interactions with nucleosomal core histones and thereby replacing linker histones at target enhancer and/or promoter sites (By similarity). Originally described as a transcription activator for a number of liver genes such as AFP, albumin, tyrosine aminotransferase, PEPCK, etc. Interacts with the cis-acting regulatory regions of these genes. Involved in glucose homeostasis; binds to and activates transcription from the G6PC promoter. Binds to the CYP3A4 promoter and activates its transcription in cooperation with CEBPA. Binds to the CYP3A7 promoter together with members of the CTF/NF-I family. Involved in regulation of neuronal-specific transcription. May be involved in regulation of spermatogenesis.<ref>PMID:12695546</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The three-dimensional structure of an HNF-3/fork head DNA-recognition motif complexed with DNA has been determined by X-ray crystallography at 2.5 A resolution. This alpha/beta protein binds B-DNA as a monomer, through interactions with the DNA backbone and through both direct and water-mediated major and minor groove base contacts, inducing a 13 degrees bend. The transcription factor fold is very similar to the structure of histone H5. In its amino-terminal half, three alpha-helices adopt a compact structure that presents the third helix to the major groove. The remainder of the protein includes a twisted, antiparallel beta-structure and random coil that interacts with the minor groove.

Co-crystal structure of the HNF-3/fork head DNA-recognition motif resembles histone H5.,Clark KL, Halay ED, Lai E, Burley SK Nature. 1993 Jul 29;364(6436):412-20. PMID:8332212<ref>PMID:8332212</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1vtn" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Burley SK]]
[[Category: Clark KL]]
[[Category: Halay ED]]
[[Category: Lai E]]