Extending fragment-based free energy calculations with library Monte Carlo simulation: annealing in interaction space.

Extending fragment-based free energy calculations with library Monte Carlo simulation: annealing in interaction space.
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DOI:
10.1002/jcc.21695
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发表时间:
2011-04-30
影响因子:
3
通讯作者:
Zuckerman, Daniel M.
Zuckerman, Daniel M.
中科院分区:
化学3区
文献类型:
--
作者:
Lettieri, Steven;Mamonov, Artem B.;Zuckerman, Daniel M.

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Pre-calculated libraries of molecular fragment configurations have previously been used as a basis for both equilibrium sampling (via library-based Monte Carlo) and for obtaining absolute free energies using a polymer-growth formalism. Here, we combine the two approaches to extend the size of systems for which free energies can be calculated. We study a series of all-atom poly-alanine systems in a simple dielectric solvent and find that precise free energies can be obtained rapidly. For instance, for 12 residues, less than an hour of single-processor is required. The combined approach is formally equivalent to the annealed importance sampling algorithm; instead of annealing by decreasing temperature, however, interactions among fragments are gradually added as the molecule is grown. We discuss implications for future binding affinity calculations in which a ligand is grown into a binding site.
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