Trefoil knotting revealed by molecular dynamics simulations of supercoiled DNA

Tamar Schlick, Wilma K. Olson

Research output: Contribution to journalArticle

Abstract

Computer simulations of the supercoiling of DNA, largely limited to stochastic search techniques, can offer important information to complement analytical models and experimental data. Through association of an energy function, minimum-energy supercoiled conformations, fluctuations about these states, and interconversions among forms may be sought. In theory, the observation of such large-scale conformational changes is possible, but modeling and numerical considerations limit the picture obtained in practice. A new computational approach is reported that combines an idealized elastic energy model, a compact B-spline representation of circular duplex DNA, and deterministic minimization and molecular dynamics algorithms. A trefoil knotting result, made possible by a large time-step dynamics scheme, is described. The simulated strand passage supports and details a supercoiled-directed knotting mechanism. This process may be associated with collective bending and twisting motions involved in supercoiling propagation and interwound branching. The results also demonstrate the potential effectiveness of the Langevin/implicit- Euler dynamics scheme for studying biomolecular folding and reactions over biologically interesting time scales.

Original languageEnglish (US)
Pages (from-to)1110-1115
Number of pages6
JournalScience
Volume257
Issue number5073
DOIs
StatePublished - 1992

ASJC Scopus subject areas

  • General

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