Substrate inactivation of bacterial l-aspartate α-decarboxylase from Corynebacterium jeikeium K411 and improvement of molecular stability by saturation mutagenesis
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Bacterial l-aspartate α-decarboxylase (PanD) is a potential biocatalyst for the green production of β-alanine, an important block chemical for manufacturing nitrogen-containing chemicals in bio-refinery field. It was reported that the poor catalytic stability caused by substrate inactivation limited the large-scale application. Here, we investigated the characters of inactivation by l-aspartate of PanD from Corynebacterium jeikeium (PDCjei), and found that l-aspartate induced a time-, and concentration-dependent inactivation of PDCjei with the values of KI and kinact being 288.4 mM and 0.235/min, respectively. To improve the catalytic stability of PDCjei, conserved amino acid residues essential to catalytic stability were analyzed by comparing the discrepancy in the observed inactivation rate of various sources. By an efficient colorimetric high-throughput screening method, four mutants with 3.18–24.69% higher activity were obtained from mutant libraries. Among them, the best mutation (R3K) also performed 66.38% higher catalytic stability than the wild type, showing great potential for industrial bio-production of β-alanine.
Keywordsl-Aspartate α-decarboxylase β-Alanine Substrate inactivation Catalytic stability Bio-production of β-alanine Saturation mutagenesis
This work was financially supported by the National Science and Technology Major Project (2016YFD0401404), the National Natural Foundation of China (31571817), national first-class discipline program of Light Industry Technology and Engineering (LITE2018-22) and Science and Technology Support Program of Jiangsu province (BE2016628).
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Conflict of interest
The authors declare that there is no conflict of interest.
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