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Proteins

Discovery of Small Molecule Inhibitors for Replication Protein A (RPA)

Strategic Insights

— 1 min read

Researchers from Vanderbilt University have successfully designed and crystallized a small molecule inhibitor of the Replication Protein A (RPA) interaction motif, a critical component of the DNA damage response and repair pathway. This innovation holds promise for the development of cancer treatments that target the upregulation of DNA damage response and repair associated with radiation or DNA-damaging agents. The study, published in Biochemistry, 2013;52(37):6515-24, details the surface reengineering of RPA70N, a subunit of the RPA protein, to facilitate the crystallization of protein-ligand complexes.

Key Takeaways:

  • The RPA70N subunit of the RPA protein plays a crucial role in DNA processing and damage response.
  • Small molecule inhibitors that disrupt the interaction between RPA70N and DNA processing proteins are of interest for cancer treatment.
  • Surface reengineering of RPA70N enabled the crystallization of protein-ligand complexes, allowing for the determination of three-dimensional structures.
  • The E7R, E100R, and E7R/E100R mutants of RPA70N were designed to alter key crystal lattice contacts, resulting in significant solvent channels open to the critical basic cleft.
  • Analysis of X-ray crystal structures, target peptide binding affinities, and (15)N-(1)H heteronuclear single-quantum coherence nuclear magnetic resonance spectra showed that the mutations do not result in perturbations of the RPA70N ligand-binding surface.
  • A fluorescence anisotropy competition binding assay revealed that the compound could inhibit the interaction of RPA70N with the peptide binding motif from the DNA damage response protein ATRIP.
  • The design of RPA70N inhibitors has significant implications for ongoing efforts to design small molecule inhibitors for cancer treatment.

M.D. Feldkamp, Vanderbilt University, designed the study and Crystallized the RPA70N-E7R complex. A.O. Frank, J.P. Kennedy, J.D. Patrone, B. Vangamudi, A.G. Waterson, S.W. Fesik, and W.J Chazin contributed to the research.

Statistics:

  • 37 number of the issue in which the study was published.
  • 52 number of the volume in which the study was published.
  • 6515 and 24 page numbers of the study in the Biochemistry journal.
  • 5 authors contributed to the research, including M.D. Feldkamp and A.O. Frank.

Sources:

  • Biochemistry, 2013;52(37):6515-24.
  • Vanderbilt University, Nashville, Tennessee, USA.
  • Springer, 233 Spring Street, New York, NY 10013, USA.

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