Abstract
HETex-SOFAST NMR (Schanda et al. in J Biomol NMR 33:199–211, 2006) has been proposed some years ago as a fast and sensitive method for semi-quantitative measurement of site-specific amide-water hydrogen exchange effects along the backbone of proteins. Here we extend this concept to BEST readout sequences that provide a better resolution at the expense of some loss in sensitivity. We discuss the theoretical background and implementation of the experiment, and demonstrate its performance for an intrinsically disordered protein, 2 well folded globular proteins, and a transiently populated folding intermediate state. We also provide a critical evaluation of the level of accuracy that can be obtained when extracting quantitative exchange rates from HETex NMR measurements.
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Acknowledgments
We thank Isabel Ayala and Karine Giandoreggio for expert protein sample preparation, and we acknowledge support from ANR grant Blanc-InterII-SIMI7-2011 (RNAfolding). This work used the NMR and isotope labeling platforms of the Grenoble Instruct centre (ISBG; UMS 3518 CNRS-CEA-UJF-EMBL) with support from FRISBI (ANR-10-INSB-05-02) and GRAL (ANR-10-LABX-49-01) within the Grenoble Partnership for Structural Biology (PSB).
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Rennella, E., Solyom, Z. & Brutscher, B. Measuring hydrogen exchange in proteins by selective water saturation in 1H–15N SOFAST/BEST-type experiments: advantages and limitations. J Biomol NMR 60, 99–107 (2014). https://doi.org/10.1007/s10858-014-9857-8
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DOI: https://doi.org/10.1007/s10858-014-9857-8