NMR-measured order parameters of methyl groups can be used to quantify the entropy of protein conformational change associated with calmodulin–peptide ligand interactions. This conformational entropy is a major contributor to the affinity of calmodulin interactions and can now be determined experimentally on a per-atom basis.
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Schwalbe, H., Rinnenthal, J. The world is flat. Nat Chem Biol 6, 312–313 (2010). https://doi.org/10.1038/nchembio.357
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DOI: https://doi.org/10.1038/nchembio.357