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Free-energy calculations - Theoretical Biophysics Group

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<strong>Free</strong>-<strong>energy</strong> perturbation <strong>calculations</strong> A pictorial representation of free-<strong>energy</strong> perturbation<br />

In FEP <strong>calculations</strong>, configurations are sampled according to the probability, P0(U),<br />

of finding the reference system in a state corresponding to the potential <strong>energy</strong> U.<br />

Does it guarantee that the key quantity for calculating ∆A, i.e. P0(∆U), is estimated<br />

accurately?<br />

Unfortunately, this does not have to be the case.<br />

FEP will only provide accurate estimates of free <strong>energy</strong> differences under the sine<br />

qua non condition that the target system be sufficiently similar to the reference system.<br />

Chris Chipot <strong>Free</strong>-<strong>energy</strong> <strong>calculations</strong>

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