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Updated: Jul 6, 2026

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

Predicting enzyme behavior in nonconventional media: correlating nitrilase function with solvent properties.

Praveen Kaul¹, U C Banerjee

¹Department of Pharmaceutical Technology (Biotechnology), National Institute of Pharmaceutical Education and Research, Sector-67, SAS Nagar, Punjab 160 062, India.

Journal of Industrial Microbiology & Biotechnology

|March 5, 2008

Summary

This summary is machine-generated.

Organic solvents enhance enzymatic nitrile hydrolysis up to a critical concentration. Solvent properties like dielectric constant and log P influence enzyme activity and selectivity, enabling enzyme engineering for improved biocatalysis.

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Area of Science:

Biocatalysis
Enzyme Engineering
Organic Chemistry

Background:

Nitrile substrates' insolubility in water limits enzymatic reaction rates.
Immobilized enzymes offer potential for improved stability and reusability in organic media.

Purpose of the Study:

To investigate the impact of water-miscible organic solvents on immobilized nitrilase activity.
To correlate enzyme function with solvent physicochemical properties for predicting enzyme behavior.
To explore solvent engineering for controlling enzyme enantioselectivity.

Main Methods:

Studied the interaction of fourteen water-miscible organic solvents with immobilized nitrilase.
Correlated enzyme function with solvent dielectric constant (epsilon) and partition coefficient (log P).
Performed kinetic analysis to determine substrate affinity (K (m)) in different solvents.

Main Results:

Organic solvents enhanced reaction rates up to a critical concentration, beyond which activity decreased due to potential denaturation.
Solvent dielectric constant showed a linear correlation with critical concentration and nitrile hydrolysis extent.
Aprotic solvents' reaction rates correlated linearly with log P, unlike alcohols.
Enzyme substrate affinity (K (m)) was highly dependent on the aprotic solvent used.
Enzyme enantioselectivity was controllable through solvent engineering.

Conclusions:

Organic solvents can be strategically used to enhance nitrilase activity and modulate enzyme performance.
Understanding solvent-enzyme interactions is crucial for optimizing biocatalytic processes.
Solvent engineering offers a viable approach to control enzyme enantioselectivity in nitrile hydrolysis.