Protein structure and dynamics in nonaqueous solvents: Insights from molecular dynamics simulation studies
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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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The structures of proteins change depending on solvent polarity, and would be expected to change within polyester droplets compared to polar solvents.
“As another example, the structures of proteins change depending on solvent polarity, and would be expected to change within polyester droplets compared to polar solvents [67,68].”
From Polyesters as a Model System for Building Primitive Biologies from Non-Biological Prebiotic Chemistry (2020) · cites this paper as [67]
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Chandru, K., Mamajanov, I., Cleaves, H. J., & Jia, T. Z. (2020) · Life · doi:10.3390/life10010006 · Cited by 47 · see citing works
- 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)
- PMC
- PMC1302733
- 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
- bronze
- doi.org
- Licence
- 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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