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Restarting Stalled Replication Forks02:37

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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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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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Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Trapping Poly(ADP-Ribose) Polymerase.

Yuqiao Shen1, Mika Aoyagi-Scharber2, Bing Wang2

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Poly(ADP-ribose) polymerase (PARP) inhibitors kill cancer cells by trapping PARP1 and PARP2 to DNA damage sites. This trapping mechanism, not just catalytic inhibition, is key for effective cancer therapy development.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Poly(ADP-ribose) polymerase (PARP) inhibitors are a promising cancer therapy.
  • A key mechanism of action involves trapping PARP1 and PARP2 at DNA damage sites.

Purpose of the Study:

  • To review the molecular interactions of clinical PARP inhibitors with PARP proteins.
  • To explain differences in drug efficacy through the PARP-trapping mechanism.
  • To guide future development of PARP inhibitors in cancer treatment.

Main Methods:

  • Review of existing data on molecular interactions.
  • Analysis of PARP-trapping activity of clinical-stage inhibitors.
  • Correlation of trapping ability with cancer cell killing.

Main Results:

  • PARP inhibitors exhibit varying abilities to trap PARP, differing by orders of magnitude.
  • PARP-trapping capacity strongly correlates with their efficacy in killing cancer cells.
  • Inhibitor-PARP interactions explain observed biologic differences.

Conclusions:

  • The PARP-trapping mechanism is crucial for the efficacy of PARP inhibitors.
  • Understanding these molecular interactions can optimize PARP inhibitor development.
  • PARP trapping offers a strategy for novel single-agent and combination cancer therapies.