View source for 7mm8


==Crystal structure of HCV NS3/4A protease in complex with NR02-08==
<StructureSection load='7mm8' size='340' side='right'caption='[[7mm8]], [[Resolution|resolution]] 1.43&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7mm8]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Hepacivirus_C Hepacivirus C]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7MM8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7MM8 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]] 1.43&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=ZJM:(1R,2R)-2-fluorocyclopentyl+{(2R,4S,6S,12Z,13aS,14aR,16aS)-2-[(7-methoxy-3-methylquinoxalin-2-yl)oxy]-14a-[(1-methylcyclopropane-1-sulfonyl)carbamoyl]-5,16-dioxo-1,2,3,5,6,7,8,9,10,11,13a,14,14a,15,16,16a-hexadecahydrocyclopropa[e]pyrrolo[1,2-a][1,4]diazacyclopentadecin-6-yl}carbamate'>ZJM</scene>, <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=7mm8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7mm8 OCA], [https://pdbe.org/7mm8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7mm8 RCSB], [https://www.ebi.ac.uk/pdbsum/7mm8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7mm8 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A0B4WYC6_9HEPC A0A0B4WYC6_9HEPC] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Third generation Hepatitis C virus (HCV) NS3/4A protease inhibitors (PIs), glecaprevir and voxilaprevir, are highly effective across genotypes and against many resistant variants. Unlike earlier PIs, these compounds have fluorine substitutions on the P2-P4 macrocycle and P1 moieties. Fluorination has long been used in medicinal chemistry as a strategy to improve physicochemical properties and potency. However, the molecular basis by which fluorination improves potency and resistance profile of HCV NS3/4A PIs is not well understood. To systematically analyze the contribution of fluorine substitutions to inhibitor potency and resistance profile, we used a multi-disciplinary approach involving inhibitor design and synthesis, enzyme inhibition assays, co-crystallography, and structural analysis. A panel of inhibitors in matched pairs were designed with and without P4 cap fluorination, tested against WT protease and the D168A resistant variant, and a total of 22 high-resolution co-crystal structures were determined. While fluorination did not significantly improve potency against the WT protease, PIs with fluorinated P4 caps retained much better potency against the D168A protease variant. Detailed analysis of the co-crystal structures revealed that PIs with fluorinated P4 caps can sample alternate binding conformations that enable adapting to structural changes induced by the D168A substitution. Our results elucidate molecular mechanisms of fluorine-specific inhibitor interactions that can be leveraged in avoiding drug resistance.

Deciphering the Molecular Mechanism of HCV Protease Inhibitor Fluorination as a General Approach to Avoid Drug Resistance.,Zephyr J, Nageswara Rao D, Vo SV, Henes M, Kosovrasti K, Matthew AN, Hedger AK, Timm J, Chan ET, Ali A, Kurt Yilmaz N, Schiffer CA J Mol Biol. 2022 Feb 17:167503. doi: 10.1016/j.jmb.2022.167503. PMID:35183560<ref>PMID:35183560</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7mm8" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Hepacivirus C]]
[[Category: Large Structures]]
[[Category: Schiffer CA]]
[[Category: Zephyr J]]