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Diphenylpyrazoles as replication protein a inhibitors
Alex G Waterson1, J Phillip Kennedy1, James D Patrone1
1Department of Biochemistry, Department of Pharmacology, Vanderbilt University School of Medicine, and Department of Chemistry, Vanderbilt University , Nashville, Tennessee 37232, United States.
ACS Medicinal Chemistry Letters
|February 21, 2015
Summary
Researchers developed new inhibitors targeting Replication Protein A (RPA) interactions crucial for DNA damage response. These diphenylpyrazole carboxylic acid compounds effectively block RPA70N protein-protein interactions at submicromolar concentrations.
Area of Science:
- Molecular Biology
- Biochemistry
- Drug Discovery
Background:
- Replication Protein A (RPA) is essential for eukaryotic DNA repair.
- RPA binds single-stranded DNA (ssDNA) and mediates DNA damage response.
- The RPA70N domain facilitates interactions with other proteins at DNA damage sites.
Purpose of the Study:
- To optimize a series of diphenylpyrazole carboxylic acid inhibitors.
- To develop potent inhibitors of RPA-protein interactions mediated by RPA70N.
- To identify chemical modifications enhancing inhibitory activity.
Main Methods:
- Structure-activity relationship (SAR) studies of diphenylpyrazole carboxylic acid derivatives.
- Systematic evaluation of substituents on aromatic rings.
- Optimization of linker type and geometry for fragment combination.
Main Results:
- Identification of a diphenylpyrazole carboxylic acid series as inhibitors of RPA-protein interactions.
- Optimization led to compounds with improved potency.
- Achieved submicromolar inhibitory activity against RPA70N protein-protein interactions.
Conclusions:
- Diphenylpyrazole carboxylic acid derivatives are effective inhibitors of RPA70N-mediated interactions.
- Chemical optimization significantly enhanced inhibitor potency.
- These optimized inhibitors represent potential tools for studying DNA repair pathways.
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