Protein conformational entropy is not slaved to water

Bryan S. Marques, Matthew A. Stetz, Christine Jorge, Kathleen G. Valentine, A. Joshua Wand, Nathaniel V. Nucci

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Conformational entropy can be an important element of the thermodynamics of protein functions such as the binding of ligands. The observed role for conformational entropy in modulating molecular recognition by proteins is in opposition to an often-invoked theory for the interaction of protein molecules with solvent water. The “solvent slaving” model predicts that protein motion is strongly coupled to various aspects of water such as bulk solvent viscosity and local hydration shell dynamics. Changes in conformational entropy are manifested in alterations of fast internal side chain motion that is detectable by NMR relaxation. We show here that the fast-internal side chain dynamics of several proteins are unaffected by changes to the hydration layer and bulk water. These observations indicate that the participation of conformational entropy in protein function is not dictated by the interaction of protein molecules and solvent water under the range of conditions normally encountered.

Original languageEnglish (US)
Article number17587
JournalScientific reports
Volume10
Issue number1
DOIs
StatePublished - Dec 1 2020

All Science Journal Classification (ASJC) codes

  • General

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