Challenges in the interpretation of protein h/d exchange data: a molecular dynamics simulation perspective

Biochemistry
Robert G McAllister, Lars Konermann

Abstract

Many protein structural investigations involve the use of H/D exchange (HDX) techniques. It is commonly thought that amide backbone protection arises from intramolecular H-bonding and/or burial of NH sites. Recently, fundamental HDX-related tenets have been called into question. The current work focuses on ubiquitin for exploring the defining features that distinguish amides in "open" (exchange-competent) and "closed" (exchange-incompetent) environments. Instead of relying on static X-ray structures, we employ all-atom molecular dynamics (MD) simulations for obtaining a dynamic view of the protein ground state and its surrounding solvent. The HDX properties for 57 out of 72 NH sites can be readily explained on the basis of backbone and side chain H-bonding, as well as solvent accessibility considerations. Unexpectedly, the same criteria fail for predicting the HDX characteristics of the remaining 15 amides. Significant protection is seen for numerous exposed NH sites that are not engaged in intramolecular H-bonds, whereas other amides that seemingly share the same features are unprotected. We scrutinize the proposal that H-bonding to crystallographically defined water can cause the protection of surface amides. For ubiquitin, t...Continue Reading

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Citations

Dec 2, 2015·Journal of the American Society for Mass Spectrometry·Mahdiar KhakinejadStephen J Valentine
Sep 5, 2015·Journal of the American Society for Mass Spectrometry·Saša KazazićAgnieszka Bzowska
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