Optimal flexibility for conformational transitions in macromolecules

Details Optimal flexibility for conformational transitions in macromolecules Optimal flexibility for conformational transitions in macromolecules

2007-04-12

arxiv.org/abs/0704.1546v1

Biology

Quantitative Biology

Biomolecules

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.178101

Conformational transitions in macromolecular complexes often involve the reorientation of lever-like structures. Using a simple theoretical model, we show that the rate of such transitions is drastically enhanced if the lever is bendable, e.g. at a localized "hinge''. Surprisingly, the transition is fastest with an intermediate flexibility of the hinge. In this intermediate regime, the transition rate is also least sensitive to the amount of "cargo'' attached to the lever arm, which could be exploited by molecular motors. To explain this effect, we generalize the Kramers-Langer theory for multi-dimensional barrier crossing to configuration dependent mobility matrices.

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