The European Physical Journal E

, Volume 19, Issue 3, pp 311–317 | Cite as

Probing DNA and RNA single molecules with a double optical tweezer

  • P. Mangeol
  • D. Côte
  • T. Bizebard
  • O. Legrand
  • U. Bockelmann
Focus Point

Abstract.

A double-tweezer setup is used to induce mechanical stress in systems of molecular biology. A double strand of DNA is first stretched and the data is compared to precedent experiments to check the experimental setup. Then a short foldable fragment of RNA is probed; the typical unfolding/refolding hysteresis behaviour of this kind of construction is shown and followed by a study of its elasticity and a comparison to a worm-like chain model. Eventually, we describe the unfolding of a larger RNA structure, which unfolds by multiple steps. We show that this unfolding is not reversible and that it presents numerous unfolding pathways.

PACS.

87.15.-v Biomolecules: structure and physical properties 87.15.He Dynamics and conformational changes 87.64.-t Spectroscopic and microscopic techniques in biophysics and medical physics 

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Copyright information

© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2006

Authors and Affiliations

  • P. Mangeol
    • 1
    • 2
  • D. Côte
    • 2
  • T. Bizebard
    • 3
  • O. Legrand
    • 2
  • U. Bockelmann
    • 1
    • 2
  1. 1.Laboratoire de Nanobiophysique, UMR CNRS 7083ESPCIParis Cedex 05France
  2. 2.Laboratoire Pierre AigrainEcole Normale SupérieureParis Cedex 05France
  3. 3.Institut de Biologie Physico-chimique, UPR CNRS 9073ParisFrance

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