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Assembly of Nucleosomal Arrays from Recombinant Core Histones and Nucleosome Positioning DNA
10:40

Assembly of Nucleosomal Arrays from Recombinant Core Histones and Nucleosome Positioning DNA

Published on: September 10, 2013

Platinum drug adduct formation in the nucleosome core alters nucleosome mobility but not positioning

Bin Wu1, Curt A Davey

  • 1Division of Structural and Computational Biology, School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore.

Chemistry & Biology
|October 23, 2008
PubMed

Insights

Platinum anticancer drugs form DNA adducts that alter nucleosome positioning and inhibit chromatin remodeling. This finding offers insights into drug resistance and toxicity, aiding the development of improved cancer therapies.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Biochemistry

Background:

  • Nucleosome positioning regulates DNA accessibility in chromatin.
  • Platinum anticancer agents form DNA adducts, disrupting nuclear functions and inducing apoptosis.
  • Understanding these mechanisms is crucial for developing better cancer treatments with reduced toxicity and resistance.

Purpose of the Study:

  • To investigate the impact of platinum adducts on nucleosome positioning and dynamics.
  • To elucidate the mechanistic basis for platinum drug-mediated inhibition of chromatin remodeling.
  • To provide insights for improving platinum-based cancer therapies.

Main Methods:

  • Studying the effects of cisplatin and oxaliplatin on nucleosome core particles.
  • Analyzing histone octamer-DNA sliding and nucleosome positioning after platinum adduct formation.

Main Results:

  • Platinum adducts inhibit histone octamer-DNA sliding within nucleosomes.
  • Adduct formation reinforces intrinsic DNA sequence-based positioning preferences.
  • Significant alterations in overall nucleosome positioning were not observed.

Conclusions:

  • Platinum adducts modulate nucleosome dynamics by inhibiting sliding, reinforcing DNA sequence-dependent positioning.
  • This modulation impacts chromatin remodeling in vivo and may shield adducts from repair.
  • Findings suggest a link between nucleosome-specific DNA properties and platinum drug selectivity, offering avenues for therapeutic improvement.

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