Improved activity and thermostability of (S)-aminotransferase by error-prone polymerase chain reaction for the production of a chiral amine
Document Type
Article
Publication Date
12-15-2007
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. © 2007 Elsevier B.V. All rights reserved.
Publication Title
Biochemical Engineering Journal
Recommended Citation
Martin, A.,
DiSanto, R.,
Plotnikov, I.,
Kamat, S.,
Shonnard, D.,
&
Pannuri, S.
(2007).
Improved activity and thermostability of (S)-aminotransferase by error-prone polymerase chain reaction for the production of a chiral amine.
Biochemical Engineering Journal,
37(3), 246-255.
http://doi.org/10.1016/j.bej.2007.05.001
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/6018