Unfolding and melting of DNA (RNA) hairpins: The concept of structure-specific 2D dynamic landscapes

Milo M. Lin, Lars Meinhold, Dmitry Shorokhov, Ahmed H. Zewail

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

A 2D free-energy landscape model is presented to describe the (un)folding transition of DNA/RNA hairpins, together with molecular dynamics simulations and experimental findings. The dependence of the (un)folding transition on the stem sequence and the loop length is shown in the enthalpic and entropic contributions to the free energy. Intermediate structures are well defined by the two coordinates of the landscape during (un)zipping. Both the free-energy landscape model and the extensive molecular dynamics simulations totaling over 10 μs predict the existence of temperature-dependent kinetic intermediate states during hairpin (un)zipping and provide the theoretical description of recent ultrafast temperature-jump studies which indicate that hairpin (un)zipping is, in general, not a two-state process. The model allows for lucid prediction of the collapsed state(s) in simple 2D space and we term it the kinetic intermediate structure (KIS) model.

Original languageEnglish (US)
Pages (from-to)4227-4239
Number of pages13
JournalPhysical Chemistry Chemical Physics
Volume10
Issue number29
DOIs
StatePublished - Jul 25 2008

ASJC Scopus subject areas

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

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