Related Experiment Video
Updated: Jun 3, 2026

08:59
Defining Substrate Specificities for Lipase and Phospholipase Candidates
Published on: November 23, 2016
Tuning lipase enantioselectivity in organic media using solid-state buffers.
M Quirós1, M C Parker, N J Turner
1Department of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.
The Journal of Organic Chemistry
|July 21, 2001
Summary
Researchers tuned the enantioselectivity of enzymes like Candida antarctica lipase B (CALB) by altering their protonation state using solid-state buffers. This method enhances lipase-catalyzed reactions in organic solvents.
Area of Science:
- Biocatalysis
- Enzyme engineering
- Organic chemistry
Background:
- Candida antarctica lipase B (CALB) displays enantioselectivity in organic solvents.
- Enzyme protonation state influences catalytic activity and selectivity.
- Controlling enzyme protonation is key to optimizing biocatalytic processes.
Purpose of the Study:
- To investigate the impact of enzyme protonation states on CALB enantioselectivity.
- To explore the use of solid-state buffers for tuning lipase enantioselectivity.
- To compare the effects of different protonation control methods on lipase performance.
Main Methods:
- Model reaction: Alcoholysis of (+/-)-2-phenyl-4-benzyloxazol-5(4H)-one using butan-1-ol.
- Enzyme protonation state manipulation using organo-soluble bases and solid-state buffers (e.g., CAPSO/CAPSO.Na).
- Analysis of enantioselectivity and catalytic rates under varying hydration conditions.
Main Results:
- Selective tuning of enantioselectivity was achieved by controlling enzyme protonation.
- Triethylamine (Et(3)N) and CAPSO/CAPSO.Na increased enantioselectivity for CALB and Mucor miehei lipase.
- Significant differences in enantioselectivity and rate were observed, particularly under hydrated conditions.
Conclusions:
- Enzyme protonation state is a critical factor for controlling enantioselectivity in CALB-catalyzed reactions.
- Solid-state buffers offer a viable method for precise tuning of lipase enantioselectivity.
- Understanding and controlling enzyme protonation can optimize biocatalysis in organic media.

