View source for 9xs5


==Factor inhibiting HIF-1 alpha in complex with Mn(II) and morin==
<StructureSection load='9xs5' size='340' side='right'caption='[[9xs5]], [[Resolution|resolution]] 2.33&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9xs5]] is a 1 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=9XS5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9XS5 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]] 2.33&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=MRI:2-[2,4-BIS(OXIDANYL)PHENYL]-3,5,7-TRIS(OXIDANYL)CHROMEN-4-ONE'>MRI</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=9xs5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9xs5 OCA], [https://pdbe.org/9xs5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9xs5 RCSB], [https://www.ebi.ac.uk/pdbsum/9xs5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9xs5 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/HIF1N_HUMAN HIF1N_HUMAN] Hydroxylates HIF-1 alpha at 'Asp-803' in the C-terminal transactivation domain (CAD). Functions as an oxygen sensor and, under normoxic conditions, the hydroxylation prevents interaction of HIF-1 with transcriptional coactivators including Cbp/p300-interacting transactivator. Involved in transcriptional repression through interaction with HIF1A, VHL and histone deacetylases. Hydroxylates specific Asn residues within ankyrin repeat domains (ARD) of NFKB1, NFKBIA, NOTCH1, ASB4, PPP1R12A and several other ARD-containing proteins. Also hydroxylates Asp and His residues within ARDs of ANK1 and TNKS2, respectively. Negatively regulates NOTCH1 activity, accelerating myogenic differentiation. Positively regulates ASB4 activity, promoting vascular differentiation.<ref>PMID:12080085</ref> <ref>PMID:12042299</ref> <ref>PMID:17003112</ref> <ref>PMID:18299578</ref> <ref>PMID:19245366</ref> <ref>PMID:17573339</ref> <ref>PMID:21251231</ref> <ref>PMID:21177872</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Factor inhibiting HIF-1alpha (FIH) is a 2-oxoglutarate-dependent oxygenase that controls hypoxia signaling and metabolic homeostasis by hydroxylating HIF-1alpha. Although selective pharmacological inhibition of FIH represents an emerging therapeutic strategy for metabolic disorders, structurally diverse natural inhibitors remain largely unexplored. Here, we identified five natural FIH inhibitors spanning distinct phytochemical classes, including three flavonoids (wogonin, luteolin, morin), a coumarin (isofraxidin), and an anthraquinone (rhein). Co-crystal structures revealed that structurally diverse natural products converge on a common bidentate metal-chelation geometry within the FIH active site despite substantial differences in scaffold architecture. Among these inhibitors, wogonin most closely mimicked the orientation of the HIF-1alpha Asn803 side chain within the substrate-binding cleft, resulting in inhibitory potency comparable to that of the 2-oxoglutarate analog N-oxalylglycine. These findings establish the first structural framework for natural-product-based FIH inhibition and demonstrate that structurally distinct natural inhibitors adopt a conserved metal-chelation geometry within the FIH active site. This framework provides a basis for the future development of metabolically oriented FIH inhibitors.

Structural Insights into Metal-Chelating Natural Inhibitors of Factor Inhibiting HIF-1alpha.,Akhsanitaqwim Y, Nakashima Y, Ikumi N, Morita H J Nat Prod. 2026 Jul 15. doi: 10.1021/acs.jnatprod.6c00734. PMID:42455177<ref>PMID:42455177</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 9xs5" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Akhsanitaqwim Y]]
[[Category: Morita H]]
[[Category: Nakashima Y]]