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MOLpull: A tool for molecular free energy reconstruction along a pulling coordinate
Estimates the force required for stretching a molecule and determines the potential of mean force along the extension coordinate.
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This tool performs a Weighted Histogram Analysis (WHAM) using molecular dynamics (MD) for statistical sampling along an unfolding pathway. TINKER 4.2  and the MM3 force field  are used for the MD propagation. The tool is useful in computing the PMF of arbitrary molecules.
A schematic representation of the computations and the system that they model can be described as follows: a molecule is attached to a surface and an AFM tip. The distance between the surface and the cantilever (L) is controlled while the force exerted, F, fluctuates. The instantaneous applied force is measured by determining the deflection of the cantilever from its equilibrium position and is given by:
F(t) = -k(ξ(t) – L)
where k is the cantilever force constant and ξ(t) is the fluctuating molecular end-to-end distance.
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