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==Rational drug design of phenazopyridine derivatives as novel inhibitors of Rev1-CT==
<StructureSection load='6ws5' size='340' side='right'caption='[[6ws5]], [[Resolution|resolution]] 2.47&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6ws5]] 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=6WS5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6WS5 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]] 2.472&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=U8M:3-[(Z)-(2,3-difluorophenyl)diazenyl]pyridine-2,6-diamine'>U8M</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=6ws5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ws5 OCA], [https://pdbe.org/6ws5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6ws5 RCSB], [https://www.ebi.ac.uk/pdbsum/6ws5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6ws5 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/REV1_HUMAN REV1_HUMAN] Deoxycytidyl transferase involved in DNA repair. Transfers a dCMP residue from dCTP to the 3'-end of a DNA primer in a template-dependent reaction. May assist in the first step in the bypass of abasic lesions by the insertion of a nucleotide opposite the lesion. Required for normal induction of mutations by physical and chemical agents.<ref>PMID:10536157</ref> <ref>PMID:10760286</ref> <ref>PMID:11278384</ref> <ref>PMID:11485998</ref> <ref>PMID:22266823</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Rev1 is a protein scaffold of the translesion synthesis (TLS) pathway, which employs low-fidelity DNA polymerases for replication of damaged DNA. The TLS pathway helps cancers tolerate DNA damage induced by genotoxic chemotherapy, and increases mutagenesis in tumors, thus accelerating the onset of chemoresistance. TLS inhibitors have emerged as potential adjuvant drugs to enhance the efficacy of first-line chemotherapy, with the majority of reported inhibitors targeting protein-protein interactions (PPIs) of the Rev1 C-terminal domain (Rev1-CT). We previously identified phenazopyridine (PAP) as a scaffold to disrupt Rev1-CT PPIs with Rev1-interacting regions (RIRs) of TLS polymerases. To explore the structure-activity relationships for this scaffold, we developed a protocol for co-crystallization of compounds that target the RIR binding site on Rev1-CT with a triple Rev1-CT/Rev7(R124A) /Rev3-RBM1 complex, and solved an X-ray crystal structure of Rev1-CT bound to the most potent PAP analogue. The structure revealed an unexpected binding pose of the compound and informed changes to the scaffold to improve its affinity for Rev1-CT. We synthesized eight additional PAP derivatives, with modifications to the scaffold driven by the structure, and evaluated their binding to Rev1-CT by microscale thermophoresis (MST). Several second-generation PAP derivatives showed an affinity for Rev1-CT that was improved by over an order of magnitude, thereby validating the structure-based assumptions that went into the compound design.

Structure-Based Drug Design of Phenazopyridine Derivatives as Inhibitors of Rev1 Interactions in Translesion Synthesis.,McPherson KS, Zaino AM, Dash RC, Rizzo AA, Li Y, Hao B, Bezsonova I, Hadden MK, Korzhnev DM ChemMedChem. 2021 Apr 8;16(7):1126-1132. doi: 10.1002/cmdc.202000893. Epub 2021 , Jan 28. PMID:33314657<ref>PMID:33314657</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6ws5" style="background-color:#fffaf0;"></div>

==See Also==
*[[DNA polymerase 3D structures|DNA polymerase 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Korzhnev DM]]
[[Category: McPherson KS]]