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==Crystal structure of potent human Dihydroorotate Dehydrogenase inhibitors based on hydroxylated azole scaffolds==
<StructureSection load='5mvd' size='340' side='right'caption='[[5mvd]], [[Resolution|resolution]] 1.95&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5mvd]] 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=5MVD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5MVD 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]] 1.95&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=FMN:FLAVIN+MONONUCLEOTIDE'>FMN</scene>, <scene name='pdbligand=ORO:OROTIC+ACID'>ORO</scene>, <scene name='pdbligand=U91:1,5-DIMETHYL-3-OXIDANYL-~{N}-[2,3,5,6-TETRAKIS(FLUORANYL)-4-PHENYL-PHENYL]PYRAZOLE-4-CARBOXAMIDE'>U91</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=5mvd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5mvd OCA], [https://pdbe.org/5mvd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5mvd RCSB], [https://www.ebi.ac.uk/pdbsum/5mvd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5mvd ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/PYRD_HUMAN PYRD_HUMAN] Defects in DHODH are the cause of postaxial acrofacial dysostosis (POADS) [MIM:[https://omim.org/entry/263750 263750]; also known as Miller syndrome. POADS is characterized by severe micrognathia, cleft lip and/or palate, hypoplasia or aplasia of the posterior elements of the limbs, coloboma of the eyelids and supernumerary nipples. POADS is a very rare disorder: only 2 multiplex families, each consisting of 2 affected siblings born to unaffected, nonconsanguineous parents, have been described among a total of around 30 reported cases.<ref>PMID:19915526</ref> 
== Function ==
[https://www.uniprot.org/uniprot/PYRD_HUMAN PYRD_HUMAN] Catalyzes the conversion of dihydroorotate to orotate with quinone as electron acceptor.
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== Publication Abstract from PubMed ==
A new generation of potent hDHODH inhibitors designed by a scaffold-hopping replacement of the quinolinecarboxylate moiety of brequinar, one of the most potent known hDHODH inhibitors, is presented here. Their general structure is characterized by a biphenyl moiety joined through an amide bridge with an acidic hydroxyazole scaffold (hydroxylated thiadiazole, pyrazole and triazole). Molecular modelling suggested that these structures should adopt a brequinar-like binding mode involving interactions with subsites 1, 2 and 4 of the hDHODH binding site. Initially, the inhibitory activity of the compounds was studied on recombinant hDHODH. The most potent compound of the series in the enzymatic assays was the thiadiazole analogue 4 (IC50 16 nM). The activity was found to be dependent on the fluoro substitution pattern at the biphenyl moiety as well as on the choice/substitution of the heterocyclic ring. Structure determination of hDHODH co-crystallized with one representative compound from each series (4, 5 and 6) confirmed the brequinar-like binding mode as suggested by modelling. The specificity of the observed effects of the compound series was tested in cell-based assays for antiproliferation activity using Jurkat cells and PHA-stimulated PBMC. These tests were also verified by addition of exogenous uridine to the culture medium. In particular, the triazole analogue 6 (IC50 against hDHODH: 45 nM) exerted potent in vitro antiproliferative and immunosuppressive activity without affecting cell survival.

Design, synthesis, biological evaluation and X-ray structural studies of potent human dihydroorotate dehydrogenase inhibitors based on hydroxylated azole scaffolds.,Sainas S, Pippione AC, Giorgis M, Lupino E, Goyal P, Ramondetti C, Buccinna B, Piccinini M, Braga RC, Andrade CH, Andersson M, Moritzer AC, Friemann R, Mensa S, Al-Kadaraghi S, Boschi D, Lolli ML Eur J Med Chem. 2017 Mar 31;129:287-302. doi: 10.1016/j.ejmech.2017.02.017. Epub , 2017 Feb 14. PMID:28235702<ref>PMID:28235702</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5mvd" style="background-color:#fffaf0;"></div>

==See Also==
*[[Dihydroorotate dehydrogenase 3D structures|Dihydroorotate dehydrogenase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Al-Kadaraghi S]]
[[Category: Andersson M]]
[[Category: Boschi D]]
[[Category: Friemann R]]
[[Category: Goyal P]]
[[Category: Lolli M]]
[[Category: Moritzer AC]]
[[Category: Pippione AC]]
[[Category: Sainas S]]