Title | Improvement in the Thermostability of a β-Amino Acid Converting ω-Transaminase by Using FoldX. |
Publication Type | Journal Article |
Year of Publication | 2018 |
Authors | Buß O, Muller D, Jager S, Rudat J, Rabe KS |
Journal | Chembiochem |
Volume | 19 |
Issue | 4 |
Pagination | 379-387 |
Date Published | 2018 Feb 16 |
ISSN | 1439-7633 |
Abstract | ω-Transaminases (ω-TAs) are important biocatalysts for the synthesis of active, chiral pharmaceutical ingredients containing amino groups, such as β-amino acids, which are important in peptidomimetics and as building blocks for drugs. However, the application of ω-TAs is limited by the availability and stability of enzymes with high conversion rates. One strategy for the synthesis and optical resolution of β-phenylalanine and other important aromatic β-amino acids is biotransformation by utilizing an ω-transaminase from Variovorax paradoxus. We designed variants of this ω-TA to gain higher process stability on the basis of predictions calculated by using the FoldX software. We herein report the first thermostabilization of a nonthermostable S-selective ω-TA by FoldX-guided site-directed mutagenesis. The melting point (T ) of our best-performing mutant was increased to 59.3 °C, an increase of 4.0 °C relative to the T value of the wild-type enzyme, whereas the mutant fully retained its specific activity. |
DOI | 10.1002/cbic.201700467 |
Alternate Journal | Chembiochem |
PubMed ID | 29120530 |