Abstract
Most biomolecular processes involve proteins shuttling among different conformational states, particularly from highly populated ground states to the lowly populated excited states that determine the interconversion rates and biological function, and which are invisible to most structural biology techniques. These structural transitions are rare and relatively fast: happen in the millisecond–microsecond timescale (ms–μs). NMR spectroscopy can access these timescales via relaxation dispersion techniques (RD-NMR). The exchange parameters extracted from RD-NMR experiments provide pivotal information on these otherwise invisible states that reports on key properties of the high free energy, reactive regions of the protein’s energy landscape, including the mechanisms of folding/unfolding and of the interconversion between active and inactive states. Here, we describe a simple, step-by-step protocol to carry out RD-NMR experiments on proteins to detect the existence of such conformational substates and characterize their structural properties (chemical shifts).
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Acknowledgments
This work was funded by Advanced Grant ERC-2012-ADG-323059 from the European Research Council to V.M. V.M. also acknowledges support from the W.M. Keck foundation and the National Science Foundation (grants NSF-MCB-1616759 and NSF-CREST-1547848).
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Veeramuthu Natarajan, S., D’Amelio, N., Muñoz, V. (2022). NMR Relaxation Dispersion Methods for the Structural and Dynamic Analysis of Quickly Interconverting, Low-Populated Conformational Substates. In: Muñoz, V. (eds) Protein Folding. Methods in Molecular Biology, vol 2376. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-1716-8_11
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DOI: https://doi.org/10.1007/978-1-0716-1716-8_11
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