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- W2058046100 abstract "Density functional theory (DFT) based quantum mechanical/molecular mechanical (QM/MM) calculations have provided valuable insight into the reactivity of the cytochrome P450 family of enzymes (P450s). A failure of commonly used DFT methods, such as B3LYP, is the neglect of dispersion interactions. An empirical dispersion correction has been shown to improve the accuracy of gas phase DFT calculations of P450s. The current work examines the effect of the dispersion correction in QM/MM calculations on P450s. The hydrogen abstraction from camphor, and hydrogen abstraction and C–O addition of cyclohexene and propene by P450cam have been modeled, along with the addition of benzene to Compound I in CYP2C9, at the B3LYP-D2/CHARMM27 level of theory. Single point energy calculations were also performed at the B3LYP-D3//B3LYP-D2/CHARMM27 level. The dispersion corrections lower activation energy barriers significantly (by ∼5 kcal/mol), as seen for gas phase calculations, but has a small effect on optimized geometries.These effects are likely to be important in modeling reactions catalyzed by other enzymes also. Given the low computational cost of including such dispersion corrections, we recommend doing so in all B3LYP based QM/MM calculations." @default.
- W2058046100 created "2016-06-24" @default.
- W2058046100 creator A5017967913 @default.
- W2058046100 creator A5044048108 @default.
- W2058046100 creator A5047006365 @default.
- W2058046100 date "2012-09-04" @default.
- W2058046100 modified "2023-09-27" @default.
- W2058046100 title "Effects of Dispersion in Density Functional Based Quantum Mechanical/Molecular Mechanical Calculations on Cytochrome P450 Catalyzed Reactions" @default.
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- W2058046100 doi "https://doi.org/10.1021/ct300329h" @default.
- W2058046100 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26605619" @default.
- W2058046100 hasPublicationYear "2012" @default.
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