Accurate Backbone 13C and 15N Chemical Shift Tensors in Galectin-3 by MAS NMR and QM/MM: Details of Structure and Environment Matter.
Related Articles Accurate Backbone 13C and 15N Chemical Shift Tensors in Galectin-3 by MAS NMR and QM/MM: Details of Structure and Environment Matter.
Chemphyschem. 2020 May 03;:
Authors: Kraus J, Gupta R, Lu M, Gronenborn A, Akke M, Polenova T
Abstract
Chemical shift tensors obtained from solid-state NMR spectroscopy are very sensitive reporters of structure and dynamics in proteins. While accurate 13 C and 15 N chemical shift tensors are accessible by magic angle spinning (MAS) NMR, their quantum mechanical calculations remain challenging, particularly for 15 N atoms. Here we compare experimentally determined backbone 13 C ? and 15 N H chemical shift tensors by MAS NMR with hybrid quantum mechanics/molecular mechanics/molecular dynamics (MD-QM/MM) calculations for the carbohydrate-binding domain of galectin-3. Excellent agreement between experimental and computed 15 N H chemical shift anisotropy values was obtained using the Amber ff15ipq force field when solvent dynamics was taken into account in the calculation. Our results establish important benchmark conditions for improving the accuracy of chemical shift calculations in proteins and may aid in the validation of protein structure models derived by MAS NMR.
PMID: 32363727 [PubMed - as supplied by publisher]
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