Cited by 149Protein Structure and DynamicsAdvanced Physical and Chemical Molecular InteractionsLipid Membrane Structure and Behavior

Protein structure and dynamics in nonaqueous solvents: Insights from molecular dynamics simulation studies

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Soares, Cláudio M., Teixeira, Vitor H., Baptista, António M.·2003·Biophysical Journal

Abstract

Protein structure and dynamics in nonaqueous solvents are here investigated using molecular dynamics simulation studies, by considering two model proteins (ubiquitin and cutinase) in hexane, under varying hydration conditions. Ionization of the protein groups is treated assuming "pH memory," i.e., using the ionization states characteristic of aqueous solution. Neutralization of charged groups by counterions is done by considering a counterion for each charged group that cannot be made neutral by establishing a salt bridge with another charged group; this treatment is more physically reasonable for the nonaqueous situation, contrasting with the usual procedures. Our studies show that hydration has a profound effect on protein stability and flexibility in nonaqueous solvents. The structure becomes more nativelike with increasing values of hydration, up to a certain point, when further increases render it unstable and unfolding starts to occur. There is an optimal amount of water, approximately 10% (w/w), where the protein structure and flexibility are closer to the ones found in aqueous solution. This behavior can explain the experimentally known bell-shaped dependence of enzyme catalysis on hydration, and the molecular reasons for it are examined here. Water and counterions play a fundamental and dynamic role on protein stabilization, but they also seem to be important for protein unfolding at high percentages of bound water.

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Crossref · 10.1016/s0006-3495(03)74972-8

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Authors
Soares, C. M., Teixeira, V. H., & Baptista, A. M.
Affiliations
Universidade Nova de Lisboa (PT)
Corresponding author
Soares, Cláudio M.
Venue
Biophysical Journal
Publisher
Elsevier BV
Published
2003-03
Volume
84
Issue
3
Pages
1628-1641
ISSN
0006-3495 (ISSN-L)
OpenAlex
W2034809628
Cited by
149
References
76
Citations by year
2026: 5 · 2025: 11 · 2024: 5 · 2023: 3 · 2022: 1 · 2021: 8 · 2020: 9 · 2019: 5 · 2018: 3 · 2017: 8 · 2016: 8 · 2015: 8 · 2014: 5 · 2013: 8 · 2012: 10
FWCI
2.06
Type
journal article
Language
en
Open access
Locations
  • Biophysical Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Advanced Physical and Chemical Molecular Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Lipid Membrane Structure and Behavior
Keywords
protein hydration, ubiquitin, cutinase, n-hexane, protein unfolding, protein flexibility, ionization state, enzyme catalysis, bound water, protein stability
MeSH terms
Carboxylic Ester Hydrolases, Catalysis, Computer Simulation, Enzyme Activation, Enzyme Stability, Enzymes, Hexanes, Hydrogen-Ion Concentration, Models, Molecular, Motion, Protein Binding, Protein Conformation, Proteins, Sensitivity and Specificity, Solvents, Water, Protein Folding, Ubiquitin

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