Affiliation:
1. grid.9227.e 0000000119573309 Chinese Academy of Sciences Key Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology Chinese Academy of Sciences 100101 Beijing China
2. grid.410726.6 0000 0004 1797 8419 College of Life Science University of Chinese Academy of Sciences 100049 Beijing China
3. grid.411503.2 0000 0000 9271 2478 College of Life Sciences Fujian Normal University 350117 Fuzhou China
Abstract
Abstract
β-Alanine (β-Ala) is an important intermediate with numerous applications in food and feed additives, pharmaceuticals, polymeric materials, and electroplating industries. Its biological production routes that employ l-aspartate-α-decarboxylase (ADC) as the key enzyme are attractive. In this study, we developed an efficient and environmentally safe method for β-Ala production by co-expressing two different subtypes of ADC. A bacterial ADC from Bacillus subtilis (BSADC) and an insect ADC from Tribolium castaneum (TCADC) use pyruvoyl and pyridoxal-5′-phosphate (PLP) as cofactor, respectively. 3050 mM (271.5 g/L) β-Ala was achieved from l-aspartic acid by using the whole-cell biocatalyst co-expressing BSADC and TCADC, corresponding to a conversion rate of 92.4%. Meanwhile, one-pot synthesis of β-Ala from fumaric acid through using a tri-enzyme cascade route with two different subtypes of ADC and l-aspartase (AspA) from Escherichia coli was established. 2250 mM (200.3 g/L) β-Ala was obtained from fumaric acid with a conversion rate of 90.0%. This work proposes a novel strategy that improves β-Ala production in the decarboxylation pathway of l-aspartic acid.
Funder
National Key R&D Program of China
Publisher
Oxford University Press (OUP)
Subject
Applied Microbiology and Biotechnology,Biotechnology,Bioengineering
Cited by
23 articles.
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