In recent years, HDX-MS (hydrogen–deuterium exchange coupled to MS) on biomolecules has evolved from a niche technique to a powerful method in the investigation of protein dynamics. Protein kinases, in particular, represent an area of active study using this technique owing to their well-characterized protein structures and their relevance to diseases such as cancer, immune disorders and neurodegenerative defects. In the present review, we describe how HDX-MS has revealed important dynamic properties of protein kinases and provided insight into the mechanisms of drug binding.

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