Free-energy calculations - Theoretical Biophysics Group
Free-energy calculations - Theoretical Biophysics Group
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>