Protein Domain Specific Covalent Inhibition of Human DNA Polymerase β |
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Authors: | Dr Shelby C Yuhas Dr Ananya Majumdar Prof Dr Marc M Greenberg |
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Affiliation: | 1. Department of Chemistry, Johns Hopkins University, 3400N. Charles St., Baltimore, MD 21218 USA;2. Biomolecular NMR Center, Johns Hopkins University, Baltimore, MD 21218 USA |
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Abstract: | DNA polymerase β (Pol β) is a frequently overexpressed and/or mutated bifunctional repair enzyme. Pol β possesses polymerase and lyase active sites, that are employed in two steps of base excision repair. Pol β is an attractive therapeutic target for which there is a need for inhibitors. Two mechanistically inspired covalent inhibitors ( 1 , IC50=21.0 μM; 9 , IC50=18.7 μM) that modify lysine residues in different Pol β active sites are characterized. Despite modifying lysine residues in different active sites, 1 and 9 inactivate the polymerase and lyase activities of Pol β. Fluorescence anisotropy experiments indicate that they do so by preventing DNA binding. Inhibitors 1 and 9 provide the basis for a general approach to preparing domain selective inhibitors of bifunctional polymerases. Such molecules could prove to be useful tools for studying the role of wild type and mutant forms of Pol β and other polymerases in DNA repair. |
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Keywords: | covalent inhibitors DNA damage DNA polymerases DNA repair enzyme inhibition |
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