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DNA Damage can Stall the Cell Cycle02:37

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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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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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The Effect of Replication Protein A Inhibition and Post-Translational Modification on ATR Kinase Signaling.

Matthew R Jordan1, Greg G Oakley2, Lindsey D Mayo1

  • 1Indiana University School of Medicine.

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New chemical inhibitors targeting replication protein A (RPA) block ATR kinase signaling, crucial for cancer cell survival. These RPA inhibitors offer a promising strategy for developing novel anti-cancer therapeutics by disrupting DNA damage response pathways.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cancer Therapeutics

Background:

  • The ATR kinase pathway is vital for maintaining genome integrity by responding to DNA damage.
  • Replication protein A (RPA) is essential for sensing single-stranded DNA and activating ATR signaling.
  • ATR pathway dysregulation is a hallmark of cancer, making it a therapeutic target.

Purpose of the Study:

  • To elucidate the mechanism of action of novel chemical RPA inhibitors (RPAi).
  • To investigate the role of RPA post-translational modifications (PTMs) in ATR kinase activation and RPAi sensitivity.
  • To provide insights into the anti-cancer potential of RPAi targeting the ATR pathway.

Main Methods:

  • Biochemically reconstituted ATR kinase signaling pathway.
  • Development and application of RPA-DNA binding inhibitors (RPA-DBi) and RPA protein-protein interaction inhibitors (RPA-PPIi).
  • Analysis of RPA and TopBP1 post-translational modifications (PTMs) including phosphorylation and acetylation.

Main Results:

  • Both RPA-DBi and RPA-PPIi effectively abrogate ATR-dependent phosphorylation of downstream targets.
  • RPA32 phosphorylation and TopBP1 phosphorylation stimulate ATR kinase activation.
  • RPA70 acetylation does not affect ATR kinase activation.
  • RPA PTMs impact ATR signaling but do not alter sensitivity to RPA inhibitors.

Conclusions:

  • Chemical RPA inhibitors effectively block ATR signaling by interfering with RPA function.
  • RPA PTMs modulate ATR kinase activation, offering a layer of regulation.
  • Understanding RPAi mechanisms and RPA PTMs is crucial for developing effective ATR-targeted cancer therapies.