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Free-energy calculations - Theoretical Biophysics Group

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<strong>Free</strong>-<strong>energy</strong> perturbation <strong>calculations</strong> Improving the efficiency of FEP <strong>calculations</strong><br />

This is tantamount to calculating<br />

1 + exp[β(∆Ui,i+1 − C)] −1 <br />

exp(−β∆Ai,i+1) = <br />

i<br />

{1 + exp[−β(∆Ui,i+1 − C)]} −1<br />

i+1<br />

× exp(−βC)<br />

C is a constant that determines the position of the additional<br />

intermediate,<br />

C = ∆Ai,i+1 + 1 ni<br />

ln<br />

β ni+1<br />

C cannot be accessed directly because it involves the<br />

unknown value of ∆Ai,i+1. Instead, the equations for<br />

exp(−β∆Ai,i+1) and C are solved iteratively at a post–<br />

processing stage.<br />

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

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