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Related Concept Videos

Translesion DNA Polymerases02:10

Translesion DNA Polymerases

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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Errors During Replication are Corrected by the DNA Polymerase Enzyme
Proofreading01:43

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Interaction between DNA Polymerase lambda and anticancer nucleoside analogs.

Miguel Garcia-Diaz1, Michael S Murray, Thomas A Kunkel

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Proofreading and DNA Repair Assay Using Single Nucleotide Extension and MALDI-TOF Mass Spectrometry Analysis
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Proofreading and DNA Repair Assay Using Single Nucleotide Extension and MALDI-TOF Mass Spectrometry Analysis

Published on: June 19, 2018

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Cancer Therapeutics

Background:

  • Anticancer drugs cytarabine (AraC) and gemcitabine (dFdC) exhibit cytotoxicity through DNA chain termination.
  • Understanding the precise mechanism of their incorporation into DNA is crucial for optimizing cancer treatment strategies.

Purpose of the Study:

  • To elucidate the atomic-level interactions of AraC and dFdC during DNA incorporation.
  • To investigate the role of human DNA polymerase lambda (Pol lambda) in the processing of these nucleoside analogs.

Main Methods:

  • X-ray crystallography was employed to determine the structures of Pol lambda complexed with gapped DNA containing AraC or dFdC opposite a template dG.
  • Structural analysis focused on the binding of the analogs within the polymerase active site and their conformational properties.

Main Results:

  • Crystal structures revealed that both AraC and dFdC can bind to the Pol lambda active site.
  • The ribose conformation of AraCTP is similar to dCTP, while dFdCTP exhibits a significantly altered ribose conformation.
  • Pol lambda efficiently incorporated AraCTP into DNA but showed no incorporation of dFdCTP.

Conclusions:

  • The distinct conformational properties of dFdCTP hinder its incorporation by Pol lambda.
  • Pol lambda's differential incorporation of AraC and dFdC suggests it may modulate the cytotoxic effects of AraC.
  • These findings provide atomic-level insights into the mechanism of action for AraC and dFdC in cancer therapy.