Enzymatic Kinetic Isotope Effects from Path-Integral Free Energy Perturbation Theory.

Enzymatic Kinetic Isotope Effects from Path-Integral Free Energy Perturbation Theory.
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DOI:
10.1016/bs.mie.2016.05.057
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发表时间:
2016
影响因子:
--
通讯作者:
Gao J
Gao J
中科院分区:
生物学4区
文献类型:
--
作者:
Gao J

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Path-integral free energy perturbation (PI-FEP) theory is presented to directly determine the ratio of quantum mechanical partition functions of different isotopologs in a single simulation. Furthermore, a double averaging strategy is used to carry out the practical simulation, separating the quantum mechanical path integral exactly into two separate calculations, one corresponding to a classical molecular dynamics simulation of the centroid coordinates, and another involving free-particle path-integral sampling over the classical, centroid positions. An integrated centroid path-integral free energy perturbation and umbrella sampling (PI-FEP/UM, or simply, PI-FEP) method along with bisection sampling was summarized, which provides an accurate and fast convergent method for computing kinetic isotope effects for chemical reactions in solution and in enzymes. The PI-FEP method is illustrated by a number of applications, to highlight the computational precision and accuracy, the rule of geometrical mean in kinetic isotope effects, enhanced nuclear quantum effects in enzyme catalysis, and protein dynamics on temperature dependence of kinetic isotope effects.
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