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- W4214890715 abstract "Optimized link bond parameters for the Cα Cβ bond of 22 different capped amino acid model systems have been determined at SCC DFTB/mio (self-consistent charge density functional tight-binding), SCC DFTB/3ob and GFNn-xTB (n = 0, 1, and 2) level in conjunction with the AMBER 99SB, 14SB, and 19B force fields. The resulting parameter sets have been compared to newly calculated reference data obtained via resolution-of-identity 2nd order Møller-Plesset perturbation theory. The data collected in this work suggests that the optimized values in this study provide a more suitable setup of the QM/MM link bonds compared to the use of a single global setting applied to every amino acid fragmented by the QM/MM interface. The results also imply that a transfer of the ideal link bond settings between different levels of theory is not advised. In contrast, virtually identical parameters were obtained in calculations employing different variants of the AMBER force field. Considering the increasing success of tight binding based approaches being inter alia a results of their exceptional accuracy/effort ratio the provided collection of link atoms parameters provides a valuable resource for QM/MM studies of biomacromolecular systems as demonstrated in an exemplary QM/MM MD simulation of the β-amyloid/Zn2+ complex." @default.
- W4214890715 created "2022-03-05" @default.
- W4214890715 creator A5023582637 @default.
- W4214890715 creator A5045644596 @default.
- W4214890715 date "2022-03-03" @default.
- W4214890715 modified "2023-09-26" @default.
- W4214890715 title "Probing the range of applicability of structure‐ and energy‐adjusted <scp>QM</scp> / <scp>MM</scp> link bonds <scp>II</scp> : Optimized link bond parameters for density functional tight binding approaches" @default.
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- W4214890715 doi "https://doi.org/10.1002/jcc.26830" @default.
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