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Default Chemical Shifts of the Carbohydrate Binding Domain of Galectin-3 from Magic Angle Spinning NMR and Hybrid Quantum Mechanics/Molecular Mechanics Calculations.

Chemical Shifts of the Carbohydrate Binding Domain of Galectin-3 from Magic Angle Spinning NMR and Hybrid Quantum Mechanics/Molecular Mechanics Calculations.

Chemical Shifts of the Carbohydrate Binding Domain of Galectin-3 from Magic Angle Spinning NMR and Hybrid Quantum Mechanics/Molecular Mechanics Calculations.

J Phys Chem B. 2018 Mar 02;:

Authors: Kraus J, Gupta R, Lu M, Yehl JB, Case DA, Gronenborn AM, Akke M, Polenova T

Abstract
Magic angle spinning NMR spectroscopy is uniquely suited to probe the structure and dynamics of insoluble proteins and protein assemblies at atomic resolution, with NMR chemical shifts containing rich information about biomolecular structure. Access to this information, however, is problematic since accurate quantum mechanical calculation of chemical shifts in proteins remains challenging, particularly for 15NH. Here we report on isotropic chemical shift predictions for the carbohydrate recognition domain of microcrystalline galectin-3, obtained from using hybrid quantum mechanics/molecular mechanics (QM/MM) calculations, implemented using an automated fragmentation approach, and using very high resolution (0.86 Ň lactose-bound and 1.25 Ň apo form) X-ray crystal structures. The resolution of the X-ray crystal structure used as an input into the AF-NMR program did not affect the accuracy of the chemical shift calculations to any significant extent. Excellent agreement between experimental and computed shifts is obtained for 13C? while larger scatter is observed for 15NH chemical shifts, which are influenced to greater extent by electrostatic interactions, hydrogen bonding, and solvation.


PMID: 29498857 [PubMed - as supplied by publisher]



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