Abstract
The saturation transfer difference (STD) experiment is a rich source of information on topological aspects of ligand binding to a receptor. The epitope mapping is based on a magnetization transfer after signal saturation from the receptor to the ligand, where interproton distances permit this process. Signal overlap in the STD spectrum can cause difficulties to correctly assign and/or quantitate the measured enhancements. To address this issue we report here a modified version of the routine experiment and a processing scheme that provides a 1D-STD homodecoupled spectrum (i.e. an experiment in which all STD signals appear as singlets) with line widths similar to those in original STD spectrum. These refinements contribute to alleviate problems of signal overlap. The experiment is based on 2D-J-resolved spectroscopy, one of the fastest 2D experiments under conventional data sampling in the indirect dimension, and provides excellent sensitivity, a key factor for the difference experiments.
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Abbreviations
- J-resolved:
-
J-resolved spectroscopy
- STD:
-
saturation transfer difference
- wg:
-
watergate
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Acknowledgements
The generous support by an EC Marie Curie Research Training Network grant (contract No. HRTN-CT-2005-019561) is gratefully acknowledged. Dr. Juan Carlos Cobas (Mestrelab research) is acknowledged for helping discussions regarding the processing of the STD-homodecoupled spectra.
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Martín-Pastor, M., Vega-Vázquez, M., De Capua, A. et al. Enhanced signal dispersion in saturation transfer difference experiments by conversion to a 1D-STD-homodecoupled spectrum. J Biomol NMR 36, 103–109 (2006). https://doi.org/10.1007/s10858-006-9055-4
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DOI: https://doi.org/10.1007/s10858-006-9055-4