Related Experiment Videos
Combination of computational prescreening and experimental library construction can accelerate enzyme optimization by
Susanne Aileen Funke1, Nikolaj Otte, Thorsten Eggert
1Institut für Molekulare Enzymtechnologie, Heinrich-Heine-Universität Düsseldorf, Forschungszentrum Jülich, Germany.
Protein Engineering, Design & Selection : PEDS
|October 6, 2005
Summary
Optimizing enzymes for chiral compound production is key. Computational methods and mutagenesis identified histidine 76 in a lipase as crucial for activity and enantioselectivity.
Area of Science:
- Biocatalysis and enzyme engineering
- Computational chemistry and molecular modeling
- Organic synthesis and chiral chemistry
Background:
- Biocatalysts offer efficient routes for chiral compound synthesis.
- Wild-type enzymes frequently require optimization for industrial applications.
- Rational design and directed evolution are essential for enzyme improvement.
Purpose of the Study:
- To investigate the lipase-catalyzed hydrolysis of 1-(2-naphthyl)ethyl acetate.
- To identify key amino acid residues influencing enzyme activity and selectivity using computational and experimental approaches.
- To validate computational predictions with experimental mutagenesis data.
Main Methods:
- Quantum Mechanics/Molecular Mechanics (QM/MM) based alanine scanning mutagenesis simulations.
- Complete saturation mutagenesis of a Bacillus subtilis lipase.
- High-throughput screening for enzyme activity and enantioselectivity.
- Enzyme kinetics and enantioselectivity assays.
Main Results:
- QM/MM alanine scanning successfully identified critical residues for enzyme activity.
- Experimental screening confirmed the importance of histidine 76 (H76).
- H76 was found to significantly impact both catalytic activity and enantioselectivity.
Conclusions:
- Computational QM/MM methods can effectively predict key residues for enzyme optimization.
- Histidine 76 is a critical determinant of activity and enantioselectivity in the studied lipase.
- Integrated computational and experimental strategies accelerate biocatalyst development for chiral synthesis.