Abstract
Phenolic acid decarboxylase (PAD) catalyzes the non-oxidative decarboxylation of p-coumaric acid (pCA) to p-hydroxystyrene (pHS). PAD from Bacillus amyloliquefaciens (BAPAD), which showed k cat/K m value for pCA (9.3 × 103 mM−1 s−1), was found as the most active one using the “Subgrouping Automata” program and by comparing enzyme activity. However, the production of pHS of recombinant Escherichia coli harboring BAPAD showed only a 22.7 % conversion yield due to product inhibition. Based on the partition coefficient of pHS and biocompatibility of the cell, 1-octanol was selected for the biphasic reaction. The conversion yield increased up to 98.0 % and 0.83 g/h/g DCW productivity was achieved at 100 mM pCA using equal volume of 1-octanol as an organic solvent. In the optimized biphasic reactor, using a three volume ratio of 1-octanol to phosphate buffer phase (50 mM, pH 7.0), the recombinant E. coli produced pHS with a 88.7 % conversion yield and 1.34 g/h/g DCW productivity at 300 mM pCA.
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This research was supported by World Class University program through the National Research Foundation of Korea grant funded by the Ministry of Education, Science and Technology (R322009000102130).
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Jung, DH., Choi, W., Choi, KY. et al. Bioconversion of p-coumaric acid to p-hydroxystyrene using phenolic acid decarboxylase from B. amyloliquefaciens in biphasic reaction system. Appl Microbiol Biotechnol 97, 1501–1511 (2013). https://doi.org/10.1007/s00253-012-4358-8
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DOI: https://doi.org/10.1007/s00253-012-4358-8