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Fast dynamics of supercoiled DNA revealed by single-molecule experiments.

Crut, Aurelien; Koster, Daniel A.; Seidel, Ralf; Wiggins, Chris H.; Dekker, Nynke H.

The dynamics of supercoiled DNA play an important role in various cellular processes such as transcription and replication that involve DNA supercoiling. We present experiments that enhance our understanding of these dynamics by measuring the intrinsic response of single DNA molecules to sudden changes in tension or torsion. The observed dynamics can be accurately described by quasistatic models, independent of the degree of supercoiling initially present in the molecules. In particular, the dynamics are not affected by the continuous removal of the plectonemes. These results set an upper bound on the hydrodynamic drag opposing plectoneme removal, and thus provide a quantitative baseline for the dynamics of bare DNA.

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Title
Proceedings of the National Academy of Sciences
DOI
https://doi.org/10.1073/pnas.0700333104

More About This Work

Academic Units
Applied Physics and Applied Mathematics
Publisher
National Academy of Sciences
Published Here
September 20, 2014