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The DNA sequence specificity of bleomycin cleavage in a systematically altered DNA sequence

Shweta D Gautam1, Jon K Chen1, Vincent Murray2

  • 1School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW, 2052, Australia.

Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry
|May 17, 2017
PubMed

Insights

Bleomycin, an anti-cancer drug, preferentially cleaves DNA at specific sequences. This study identified a refined consensus DNA sequence (5'-YYGT*AW) for bleomycin cleavage in plasmid DNA, differing from genome-wide findings.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Bleomycin is a clinically utilized anti-tumour agent for cancer treatment.
  • Bleomycin functions by cleaving DNA at specific recognition sequences.
  • Previous genome-wide studies identified a general bleomycin cleavage preference of 5"-RTGT*AY in human cells.

Purpose of the Study:

  • To precisely determine the optimal DNA sequence for bleomycin cleavage.
  • To investigate the impact of individual nucleotide variations on bleomycin's DNA cleavage efficiency.
  • To compare sequence specificity in a controlled plasmid system versus genome-wide data.

Main Methods:

  • Construction of a plasmid clone containing the 5"-RTGT*AY sequence.
  • Systematic single-nucleotide variations within the 5"-RTGT*AY sequence.
  • Analysis of bleomycin cleavage efficiency at varied sequences.

Main Results:

  • The preferred consensus DNA sequence for bleomycin cleavage in the plasmid clone was determined to be 5"-YYGT*AW.
  • The most efficiently cleaved sequence identified was 5"-TCGT*AT.
  • The seven most highly cleaved sequences all conformed to the 5"-YYGT*AW consensus.
  • Comparison with genome-wide data revealed similarities in the core sequence but differences in surrounding nucleotides.

Conclusions:

  • The plasmid-based system refines the consensus DNA sequence for bleomycin cleavage to 5 ahydrogen-YYGT*AW.
  • Nucleotide context significantly influences bleomycin's DNA cleavage activity.
  • Understanding sequence specificity aids in optimizing bleomycin's therapeutic application and developing targeted drug delivery systems.
Keywords:
BleomycinCleavage sitesConsensus sequenceDNA damageDNA sequence specificityPlasmid vs genome-wide

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