How Much Entropy Is Contained in NMR Relaxation Parameters?

Falk Hoffmann*, Frans A.A. Mulder*, Lars V. Schäfer*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Solution-state NMR relaxation experiments are the cornerstone to study internal protein dynamics at an atomic resolution on time scales that are faster than the overall rotational tumbling time τR. Since the motions described by NMR relaxation parameters are connected to thermodynamic quantities like conformational entropies, the question arises how much of the total entropy is contained within this tumbling time. Using all-atom molecular dynamics simulations of the T4 lysozyme, we found that entropy buildup is rather fast for the backbone, such that the majority of the entropy is indeed contained in the short-time dynamics. In contrast, the contribution of the slow dynamics of side chains on time scales beyond τR on the side-chain conformational entropy is significant and should be taken into account for the extraction of accurate thermodynamic properties.

Original languageEnglish
JournalJournal of Physical Chemistry B
Volume126
Issue1
Pages (from-to)54-68
Number of pages15
ISSN1520-6106
DOIs
Publication statusPublished - Jan 2022

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