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Assessing the One-Bond C?-H Spin-Spin Coupling Constants in Proteins: Pros and Cons of Different Approaches.


ABSTRACT: In the present work, we explore three different approaches for the computation of the one-bond spin-spin coupling constants (SSCC) 1JC?H in proteins: density functional theory (DFT) calculations, a Karplus-like equation, and Gaussian process regression. The main motivation of this work is to select the best method for fast and accurate computation of the 1JC?H SSCC, for its use in everyday applications in protein structure validation, refinement, and/or determination. Our initial results showed a poor agreement between the DFT-computed and observed 1JC?H SSCC values. Further analysis leads us to the understanding that the model chosen for the DFT computations is inappropriate and that more complex models will require a higher, if not prohibitively, computational cost. Finally, we show that the Karplus-like equation and Gaussian Process regression provide faster and more accurate results than DFT-based calculations.

SUBMITTER: Arroyuelo A 

PROVIDER: S-EPMC7082799 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Assessing the One-Bond C<sub>α</sub>-H Spin-Spin Coupling Constants in Proteins: Pros and Cons of Different Approaches.

Arroyuelo Agustina A   Martin Osvaldo A OA   Scheraga Harold A HA   Vila Jorge A JA  

The journal of physical chemistry. B 20200123 5


In the present work, we explore three different approaches for the computation of the one-bond spin-spin coupling constants (SSCC) <sup>1</sup><i>J</i><sub>CαH</sub> in proteins: density functional theory (DFT) calculations, a Karplus-like equation, and Gaussian process regression. The main motivation of this work is to select the best method for fast and accurate computation of the <sup>1</sup><i>J</i><sub>CαH</sub> SSCC, for its use in everyday applications in protein structure validation, ref  ...[more]

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