Ethidium bromide–DNA complex: Wavelength dependence of pyrimidine dimer inhibition and sensitized fluorescence as probes of excited states

J. C. Sutherland, B. M. Sutherland

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Ethidium bromide inhibits the formation of ultraviolet‐induced pyrimidine dimers in DNA. The efficiency of dimer inhibition increases with increasing energy of the exciting photons. The efficiency of energy transfer from the DNA singlet to the dye singlet, as monitored by sensitized fluorescence, is independent of wavelength. The efficiency of singlet–singlet transfer agrees with that for dimer inhibition at photon energies corresponding to excitation of the lowest singlet state of DNA. Our results support a model in which dimers are formed both directly from the singlet state and also from the triplet state, with triplets arising from higher vibrational levels of the singlet.

Original languageEnglish (US)
Pages (from-to)639-653
Number of pages15
JournalBiopolymers
Volume9
Issue number6
DOIs
StatePublished - Jan 1 1970
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Biomaterials
  • Organic Chemistry

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