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How Does Thymine DNA Survive Ultrafast Dimerization Damage?

Hongjuan Wang1,2, Xuebo Chen1

  • 1Key Laboratory of Theoretical and Computational Photochemistry of Ministry of Education, Department of Chemistry, Beijing Normal University, Xin-wai-da-jie No. 19, Beijing 100875, China. xuebochen@bnu.edu.cn.

Molecules (Basel, Switzerland)
|January 3, 2017
PubMed
Summary
This summary is machine-generated.

Thymine bases in DNA can avoid photodimerization damage through a monomer-like decay pathway. This rapid relaxation, involving methyl group twisting, protects DNA from ultrafast dimerization, preventing mutagenesis.

Keywords:
ab initio calculationdimerizationphotostabilitythymine DNA

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Area of Science:

  • Photochemistry
  • Molecular Biophysics
  • DNA Damage and Repair

Background:

  • Adjacent thymine bases in DNA can undergo photodimerization, a reaction linked to DNA mutagenesis and skin cancer.
  • This photoreaction occurs rapidly on a picosecond timescale via low-barrier pathways.
  • Observed dimerization quantum yields are unexpectedly low, suggesting protective mechanisms exist.

Purpose of the Study:

  • To investigate the excited state relaxation pathways of thymine in aqueous solution and DNA oligomers.
  • To understand the mechanism behind thymine's photostability despite rapid dimerization potential.
  • To explain the low observed dimerization quantum yield in thymine multimers.

Main Methods:

  • Accurate quantum calculations using the CASPT2//CASSCF/AMBER method.
  • Mapping excited state relaxation pathways for thymine monomer and oligomers.
  • Analyzing conical intersections between excited and ground states.

Main Results:

  • A monomer-like decay pathway was identified in single-stranded thymine oligomers.
  • Methyl group twisting was found to induce this rapid relaxation pathway.
  • This pathway facilitates efficient ground-state recovery by dissipating excitation energy.

Conclusions:

  • Thymine's photostability in DNA is ensured by a methyl group twisting-induced bypass channel.
  • Conical intersections effectively regulate this fast relaxation, preventing dimerization.
  • This mechanism explains thymine's ability to survive ultrafast dimerization damage.