Temperature dependence of interaction between double stranded DNA and Cy3 or Cy5

Xun Li, Yandong Yin, Xinxing Yang, Zeyong Zhi, Xin Sheng Zhao

Research output: Contribution to journalArticle

Abstract

Fluorescence resonance energy transfer (FRET) has been widely used as molecular rulers to measure the distance in biomolecules. In this Letter, double stranded DNA (dsDNA) with Cy3 and Cy5 labeled on the 5′-terminals of each strand is used to investigate how temperature influences the interaction between dsDNA and Cy3/Cy5. By applying the orientation-dependent model to fit our FRET data, we found that the interaction between dsDNA and Cy3/Cy5 is so strong that Cy3 and Cy5 are mostly capped on the end of dsDNA duplex in temperature range of 4-50 °C. So, the orientation factor has to be cautiously considered when using FRET to measure distance. Meanwhile, with the increase of temperature, the orientational randomization of the dyes becomes more prominent.

Original languageEnglish (US)
Pages (from-to)271-275
Number of pages5
JournalChemical Physics Letters
Volume513
Issue number4-6
DOIs
StatePublished - Sep 15 2011
Externally publishedYes

Fingerprint

resonance fluorescence
deoxyribonucleic acid
energy transfer
temperature dependence
DNA
interactions
strands
Temperature
temperature
Biomolecules
dyes
Coloring Agents
cyanine dye 5
Fluorescence Resonance Energy Transfer

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Temperature dependence of interaction between double stranded DNA and Cy3 or Cy5. / Li, Xun; Yin, Yandong; Yang, Xinxing; Zhi, Zeyong; Zhao, Xin Sheng.

In: Chemical Physics Letters, Vol. 513, No. 4-6, 15.09.2011, p. 271-275.

Research output: Contribution to journalArticle

Li, Xun ; Yin, Yandong ; Yang, Xinxing ; Zhi, Zeyong ; Zhao, Xin Sheng. / Temperature dependence of interaction between double stranded DNA and Cy3 or Cy5. In: Chemical Physics Letters. 2011 ; Vol. 513, No. 4-6. pp. 271-275.
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