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Improved activity and thermostability of (S)-aminotransferase by error-prone polymerase chain reaction for the production of a chiral amine

Paper ID Volume ID Publish Year Pages File Format Full-Text
4480 228 2007 10 PDF Available
Title
Improved activity and thermostability of (S)-aminotransferase by error-prone polymerase chain reaction for the production of a chiral amine
Abstract

The evolution of a mesophilic aminotransferase, isolated from Athrobacter citreus, to a thermostable aminotransferase was accomplished via error-prone PCR. After three rounds of mutagenesis, a mutant was generated that decreased the biocatalyst loading 3-fold. This improved biocatalyst was engineered further and a new mutant was isolated that was capable of the same performance with 5-fold reduction in biocatalyst loading. Overall, the best mutant (#6) enabled a 3-fold reduction in biocatalyst loading, almost a 5-fold increase in product concentration, and a 5-fold reduction in process cycle time. Through these rounds of mutagenesis enzyme specific activity improved from 5.9 to 1582.8 IU/g with an overall improvement in product yield due to reduced biocatalyst loading. The new mutants were also able to operate at temperatures greater than 50 °C for an extended period of time. A simple cost model was developed to describe the impact of enzyme improvement on product cost.

Keywords
Biocatalysis; Biotransformations; Chiral systems; Enzyme biocatalysis; Enzyme technology; Enzyme production
First Page Preview
Improved activity and thermostability of (S)-aminotransferase by error-prone polymerase chain reaction for the production of a chiral amine
Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 37, Issue 3, 15 December 2007, Pages 246–255
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering