Correlating fluorescence microscopy, optical and magnetic tweezers to study single chiral biopolymers such as DNA

Author:

Shepherd Jack W.,Guilbaud Sebastien,Zhou Zhaokun,Howard Jamieson A. L.,Burman Matthew,Schaefer CharleyORCID,Kerrigan AdamORCID,Steele-King Clare,Noy AgnesORCID,Leake Mark C.ORCID

Abstract

AbstractBiopolymer topology is critical for determining interactions inside cell environments, exemplified by DNA where its response to mechanical perturbation is as important as biochemical properties to its cellular roles. The dynamic structures of chiral biopolymers exhibit complex dependence with extension and torsion, however the physical mechanisms underpinning the emergence of structural motifs upon physiological twisting and stretching are poorly understood due to technological limitations in correlating force, torque and spatial localization information. We present COMBI-Tweez (Combined Optical and Magnetic BIomolecule TWEEZers), a transformative tool that overcomes these challenges by integrating optical trapping, time-resolved electromagnetic tweezers, and fluorescence microscopy, demonstrated on single DNA molecules, that can controllably form and visualise higher order structural motifs including plectonemes. This technology combined with cutting-edge MD simulations provides quantitative insight into complex dynamic structures relevant to DNA cellular processes and can be adapted to study a range of filamentous biopolymers.

Funder

Leverhulme Trust

RCUK | Biotechnology and Biological Sciences Research Council

RCUK | Engineering and Physical Sciences Research Council

Publisher

Springer Science and Business Media LLC

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