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==Crystal Structure of the Heterodimeric HIF-2a:ARNT Complex with HRE DNA==
<StructureSection load='4zpk' size='340' side='right'caption='[[4zpk]], [[Resolution|resolution]] 3.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4zpk]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4ZPK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4ZPK FirstGlance]. <br>
</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=4zpk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4zpk OCA], [https://pdbe.org/4zpk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4zpk RCSB], [https://www.ebi.ac.uk/pdbsum/4zpk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4zpk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ARNT_MOUSE ARNT_MOUSE] Required for activity of the Ah (dioxin) receptor. This protein is required for the ligand-binding subunit to translocate from the cytosol to the nucleus after ligand binding. The complex then initiates transcription of genes involved in the activation of PAH procarcinogens. The heterodimer with HIF1A or EPAS1/HIF2A functions as a transcriptional regulator of the adaptive response to hypoxia (By similarity).
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== Publication Abstract from PubMed ==
The hypoxia-inducible factors (HIFs) coordinate cellular adaptations to low oxygen stress by regulating transcriptional programs in erythropoiesis, angiogenesis and metabolism. These programs promote the growth and progression of many tumours, making HIFs attractive anticancer targets. Transcriptionally active HIFs consist of HIF-alpha and ARNT (also called HIF-1beta) subunits. Here we describe crystal structures for each of mouse HIF-2alpha-ARNT and HIF-1alpha-ARNT heterodimers in states that include bound small molecules and their hypoxia response element. A highly integrated quaternary architecture is shared by HIF-2alpha-ARNT and HIF-1alpha-ARNT, wherein ARNT spirals around the outside of each HIF-alpha subunit. Five distinct pockets are observed that permit small-molecule binding, including PAS domain encapsulated sites and an interfacial cavity formed through subunit heterodimerization. The DNA-reading head rotates, extends and cooperates with a distal PAS domain to bind hypoxia response elements. HIF-alpha mutations linked to human cancers map to sensitive sites that establish DNA binding and the stability of PAS domains and pockets.

Structural integration in hypoxia-inducible factors.,Wu D, Potluri N, Lu J, Kim Y, Rastinejad F Nature. 2015 Aug 5. doi: 10.1038/nature14883. PMID:26245371<ref>PMID:26245371</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 4zpk" style="background-color:#fffaf0;"></div>

==See Also==
*[[3D structures of hypoxia-inducible factor|3D structures of hypoxia-inducible factor]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Kim Y]]
[[Category: Lu J]]
[[Category: Potluri N]]
[[Category: Rastinejad F]]
[[Category: Wu D]]