期刊
NATURE METHODS
卷 7, 期 12, 页码 977-U54出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMETH.1520
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资金
- Netherlands Organization for Scientific Research (Nederlandse Organisatie voor Wetenschappelijk Onderzoek)
- Delft University of Technology
- European Science Foundation
We introduce magnetic torque tweezers, which enable direct single-molecule measurements of torque. Our measurements of the effective torsional stiffness C of dsDNA indicated a substantial force dependence, with C = similar to 40 nm at low forces up to C = similar to 100 nm at high forces. The initial torsional stiffness of RecA filaments was nearly twofold larger than that for dsDNA, yet at moderate torques further build-up of torsional strain was prevented.
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