Extracellular Expression of L-Aspartate-α-Decarboxylase from Bacillus tequilensis and Its Application in the Biosynthesis of ß-Alanine.
Appl Biochem Biotechnol
; 189(1): 273-283, 2019 Sep.
Article
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| MEDLINE
| ID: mdl-30972708
ABSTRACT
L-aspartate-α-decarboxylase was extracellularly expressed to enhance its production for ß-alanine biosynthesis. L-aspartate-α-decarboxylase and cutinase were coexpressed in Escherichia coli; more than 40% of the L-aspartate-α-decarboxylase was secreted into the medium. Selection of best conditions among tested variables enhanced L-aspartate-α-decarboxylase production by the recombinant strain. The total L-aspartate-α-decarboxylase activity reached 20.3 U/mL. Analysis of the enzymatic properties showed that the optimum temperature and pH for L-aspartate-α-decarboxylase were 60 °C and 7.5, respectively. Enzyme activity was stable at pH 4.0-8.5 and displayed sufficient thermal stability at temperatures < 50 °C. In addition, enzymatic synthesis of ß-alanine was performed using extracellularly expressed L-aspartate-α-decarboxylase, and a mole conversion rate of > 99% was reached with a substrate concentration of 1.5 M. Extracellular expression of L-aspartate-α-decarboxylase resulted in increased enzyme production, indicating its possible application in the enzymatic synthesis of ß-alanine.
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MEDLINE
Asunto principal:
Bacillus
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Proteínas Bacterianas
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Carboxiliasas
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Beta-Alanina
Idioma:
En
Revista:
Appl Biochem Biotechnol
Año:
2019
Tipo del documento:
Article