Alchemical free energy calculations via metadynamics: Application to the theophylline‐RNA aptamer complex
Alchemical free energy calculations via metadynamics: Application to the theophylline‐RNA aptamer complex
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通过元动力学计算炼金术自由能:在茶碱-RNA适体复合物中的应用
DOI:
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发表时间:
2020
影响因子:
3
通讯作者:
A. Matsuura
中科院分区:
文献类型:
--
作者:
Y. Tanida;A. Matsuura
We propose a computational workflow for robust and accurate prediction of both binding poses and their affinities at early stage in designing drug candidates. Small, rigid ligands with few intramolecular degrees of freedom, for example, fragment‐like molecules, have multiple binding poses, even at a single binding site, and their affinities are often close to each other. We explore various structures of ligand binding to a target through metadynamics using a small number of collective variables, followed by reweighting to obtain the atomic coordinates. After identifying each binding pose by cluster analysis, we perform alchemical free energy calculations on each structure to obtain the overall value. We applied this protocol in computing free energy of binding for the theophylline‐RNA aptamer complex. Of the six (meta)stable structures found, the most favorable binding structure is consistent with the structure obtained by NMR. The overall free energy of binding reproduces the experimental values very well.
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