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Translesion DNA Polymerases02:10

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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
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Noncompetitive Inhibition of DNA Polymerase β by a Nonnative Nucleotide.

A Hasan Howlader1, Xuanhe Jiang1, Zehui Zhou1

  • 1Johns Hopkins University, Department of Chemistry, 3400 N. Charles St., Baltimore, Maryland 21218, United States.

The Journal of Organic Chemistry
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We identified potent, noncovalent inhibitors of DNA polymerase β (Pol β), a key enzyme in DNA repair. These novel nucleotide analogs offer a promising starting point for developing new cancer therapeutics targeting Pol β.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Medicinal Chemistry

Background:

  • Base excision repair (BER) is crucial for genomic stability.
  • DNA polymerase β (Pol β) is a key enzyme in BER, implicated in cancer and synthetic lethality with BRCA1/2 deficiency.

Purpose of the Study:

  • To discover and characterize noncovalent inhibitors of DNA polymerase β (Pol β).
  • To explore the potential of these inhibitors as tools for biochemical studies and as leads for new cancer therapies.

Main Methods:

  • Inhibitor screening and identification from a library of modified pyrimidine nucleotides.
  • Biochemical assays to determine inhibitor potency (Ki) and mechanism of action (noncompetitive inhibition).
  • Structural and kinetic analyses, including fluorescence anisotropy, to understand inhibitor binding.

Main Results:

  • Identification of potent noncovalent Pol β inhibitors with Ki values ≤ 70 nM.
  • Demonstration of noncompetitive inhibition, with the most potent inhibitor binding to the lyase domain without blocking DNA binding.
  • Limited cytotoxic synergism observed with methyl methanesulfonate, despite cellular uptake of inhibitors.

Conclusions:

  • Novel noncovalent Pol β inhibitors were developed with high potency and unique binding characteristics.
  • These inhibitors serve as valuable tools for biochemical research and potential starting points for developing targeted cancer treatments.
  • Further optimization is needed to enhance cellular activity and therapeutic efficacy.