Abstract
It has been apparent for some years that the structures of proteins are dynamic rather than static. For some proteins, dynamics is essential to function (e.g., refs. 1–7). These structural changes have been detected for more than 30 yr by observing hydrogen exchange between peptide amide hydrogens and solvent containing the hydrogen isotopes tritium or deuterium (8–10). Although tritium is no longer used extensively for this purpose, deuterium is widely used in hydrogen exchange studies, especially in multidimensional nuclear magnetic resonance (NMR), in which amide hydrogen signals disappear on deuteration. Since deuterium weighs 1 Dalton more than protium, hydrogen exchange in proteins can also be detected by mass spectrometry. This approach is complementary to NMR in some respects and clearly advantageous in others.
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