Kinetics of conformational fluctuations in DNA hairpin-loops

Grégoire Bonnet, Oleg Krichevsky, Albert Libchaber

Research output: Contribution to journalArticlepeer-review

473 Scopus citations

Abstract

The kinetics of DNA hairpin-loop fluctuations has been investigated by using a combination of fluorescence energy transfer and fluorescence correlation spectroscopy. We measure the chemical rates and the activation energies associated with the opening and the closing of the hairpin for different sizes and sequences of the loop and for various salt concentrations. The rate of unzipping of the hairpin stem is essentially independent of the characteristics of the loop, whereas the rate of closing varies greatly with the loop length and sequence. The closing rate scales with the loop length, with an exponent 2.6 ± 0.3. The closing rate is increased at higher salt concentrations. For hairpin closing, a loop of adenosine repeats leads to smaller rates and higher activation energies than a loop with thymine repeats.

Original languageEnglish
Pages (from-to)8602-8606
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume95
Issue number15
DOIs
StatePublished - 21 Jul 1998
Externally publishedYes

Keywords

  • Fluorescence correlation spectroscopy
  • Fluorescence energy transfer
  • Folding kinetics
  • Molecular beacons
  • Polymer conformation

ASJC Scopus subject areas

  • General

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