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Solvent structure and enzyme activity.
- Source :
-
Journal of biomolecular structure & dynamics [J Biomol Struct Dyn] 1985 Aug; Vol. 3 (1), pp. 197-204. - Publication Year :
- 1985
-
Abstract
- Enzymes are fluctuating particles in thermal equilibrium with their solvent environment. A variety of models of enzyme action have postulated selective excitation of enzyme vibrational modes or triggering of correlated motion of catalytic groups through collisions with solvent particles as the basis of catalytic activity. Solvent composition and structure are expected to influence such interactions. Solutes such as p-dioxane, t-butanol, and tetraalkylammonium chlorides are known to be strong perturbants of the structure of water. However, when the kinetic parameters of two enzymes, carboxypeptidase A and alpha-chymotrypsin, were examined carefully in aqueous mixtures containing these solutes, no significant influence of solvent structure or mass composition on the catalytic rate constant was found. The results indicate, furthermore, that, within the low viscosity limit, fluctuations in enzyme structure that are responsible for activated processes in the catalytically rate limiting step appear not to be significantly influenced by dynamic processes in the bulk solvent.
- Subjects :
- Binding Sites
Kinetics
Molecular Structure
Solvents
Enzymes
Subjects
Details
- Language :
- English
- ISSN :
- 0739-1102
- Volume :
- 3
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Journal of biomolecular structure & dynamics
- Publication Type :
- Academic Journal
- Accession number :
- 3917015
- Full Text :
- https://doi.org/10.1080/07391102.1985.10508407