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Cooperative hydration effect causes thermal unfolding of proteins and water activity plays a key role in protein stability in solutions

Paper ID Volume ID Publish Year Pages File Format Full-Text
20001 43152 2016 5 PDF Available
Title
Cooperative hydration effect causes thermal unfolding of proteins and water activity plays a key role in protein stability in solutions
Abstract

•Enthalpies of H-bonding between amino acid residues and their hydration are different.•The above enthalpy difference is strongly amplified by cooperative hydration effect.•Cooperative hydration effect causes protein thermal unfolding.•Water activity plays an important role in protein stability in solutions.

The protein unfolding process observed in a narrow temperature range was clearly explained by evaluating the small difference in the enthalpy of hydrogen-bonding between amino acid residues and the hydration of amino acid residue separately. In aqueous solutions, the effect of cosolute on the protein stability is primarily dependent on water activity, aw, the role of which has been long neglected in the literature. The effect of aw on protein stability works as a power law so that a small change in aw is amplified substantially through the cooperative hydration effect. In the present approach, the role of hydrophobic interaction stands behind. This affects protein stability indirectly through the change in solution structure caused by the existence of cosolute.

Keywords
Protein stability; Thermal unfolding; Unfolding enthalpy; Cooperative hydration; Hydrogen bonding; Water activity; Solution structure; Hydrophobic interaction
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Cooperative hydration effect causes thermal unfolding of proteins and water activity plays a key role in protein stability in solutions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 122, Issue 2, August 2016, Pages 203–207
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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