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In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity

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Published on: March 25, 2020

Natural diversity to guide focused directed evolution.

Helge Jochens¹, Uwe T Bornscheuer

¹Department of Biotechnology and Enzyme Catalysis, Institute of Biochemistry, Greifswald University, Felix-Hausdorff-Strasse 4, 17487 Greifswald, Germany.

Chembiochem : a European Journal of Chemical Biology

|August 4, 2010

Summary

This summary is machine-generated.

Researchers engineered an esterase enzyme from Pseudomonas fluorescens for better enantioselective conversion of 3-phenylbutyric acid esters (3-PBA). This "smart" mutagenesis approach significantly enhanced enzyme activity and enantioselectivity for industrial applications.

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Area of Science:

Enzyme engineering
Protein biochemistry
Biocatalysis

Background:

Esterases are crucial biocatalysts for various chemical transformations.
Improving enantioselectivity of esterases is key for chiral synthesis.
Pseudomonas fluorescens esterase has limited application for 3-phenylbutyric acid esters (3-PBA) conversion.

Purpose of the Study:

To enhance the enantioselective conversion of 3-phenylbutyric acid esters (3-PBA) using Pseudomonas fluorescens esterase.
To develop a "smart" site-saturation mutagenesis strategy for efficient enzyme engineering.
To identify improved esterase variants with higher activity and enantioselectivity.

Main Methods:

Performed simultaneous multiple site-saturation mutagenesis at four active-site positions of the esterase.
Utilized codon choice based on structural alignment of 1751 alpha/beta-hydrolase fold enzyme sequences.
Focused mutagenesis on frequently occurring amino acids in structurally equivalent positions to reduce screening complexity.

Main Results:

The wild-type esterase exhibited low activity and poor enantioselectivity (E(true)=3.2) towards 3-PBA-ethyl ester.
Engineered "smart" libraries yielded esterase variants with up to 240-fold increased reaction rates.
Identified variants demonstrated significantly improved enantioselectivities, reaching up to E(true)=80.

Conclusions:

The "smart" site-saturation mutagenesis strategy is effective for enhancing esterase performance.
Engineered Pseudomonas fluorescens esterase variants show promise for efficient and enantioselective 3-PBA conversion.
This approach offers a reduced screening effort for identifying functionally improved enzyme variants.