Curvature of the energy landscape and folding of model proteins

Details Curvature of the energy landscape and folding of model proteins Curvature of the energy landscape and folding of model proteins

2006-03-15

arxiv.org/abs/cond-mat/0603409v2

Phys. Rev. Lett. 97, 218104 (2006)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 1 figure. Revised version accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.97.218104

We study the geometric properties of the energy landscape of coarse-grained, off-lattice models of polymers by endowing the configuration space with a suitable metric, depending on the potential energy function, such that the dynamical trajectories are the geodesics of the metric. Using numerical simulations, we show that the fluctuations of the curvature clearly mark the folding transition, and that this quantity allows to distinguish between polymers having a protein-like behavior (i.e., that fold to a unique configuration) and polymers which undergo a hydrophobic collapse but do not have a folding transition. These geometrical properties are defined by the potential energy without requiring any prior knowledge of the native configuration.

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