Jamming proteins with slipknots and their free energy landscape

Details Jamming proteins with slipknots and their free energy landscape Jamming proteins with slipknots and their free energy landscape

2009-12-30

arxiv.org/abs/1001.0009v1

Phys. Rev. Lett. 103, 268103 (2009)

Biology

Quantitative Biology

Biomolecules

5 pages

Scientific paper

10.1103/PhysRevLett.103.268103

Theoretical studies of stretching proteins with slipknots reveal a surprising growth of their unfolding times when the stretching force crosses an intermediate threshold. This behavior arises as a consequence of the existence of alternative unfolding routes that are dominant at different force ranges. Responsible for longer unfolding times at higher forces is the existence of an intermediate, metastable configuration where the slipknot is jammed. Simulations are performed with a coarsed grained model with further quantification using a refined description of the geometry of the slipknots. The simulation data is used to determine the free energy landscape (FEL) of the protein, which supports recent analytical predictions.

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