Abstract
A new phenolic acid decarboxylase gene (blpad) from Bacillus licheniformis was cloned and overexpressed in Escherichia coli. The full-length blpad encodes a 166-amino acid polypeptide with a predicted molecular mass and pI of 19,521 Da and 5.02, respectively. The recombinant BLPAD displayed maximum activity at 37 °C and pH 6.0. This enzyme possesses a broad substrate specificity and is able to decarboxylate p-coumaric, ferulic, caffeic, and sinapic acids at the relative ratios of specific activities 100:74.59:34.41:0.29. Kinetic constant K m values toward p-coumaric, ferulic, caffeic, and sinapic acids were 1.64, 1.55, 1.93, and 2.45 mM, and V max values were 268.43, 216.80, 119.07, and 0.78 U mg−1, respectively. In comparison with other phenolic acid decarboxylases, BLPAD exhibited remarkable organic solvent tolerance and good thermal stability. BLPAD showed excellent catalytic performance in biphasic organic/aqueous systems and efficiently converted p-coumaric and ferulic acids into 4-vinylphenol and 4-vinylguaiacol. At 500 mM of p-coumaric and ferulic acids, the recombinant BLPAD produced a total 60.63 g l−1 4-vinylphenol and 58.30 g l−1 4-vinylguaiacol with the conversion yields 97.02 and 70.96 %, respectively. The low yield and product concentration are the crucial drawbacks to the practical bioproduction of vinyl phenol derivatives using phenolic acid decarboxylases. These unusual properties make BLPAD a desirable biocatalyst for commercial use in the bioconversion of hydroxycinnamic acids to vinyl phenol derivatives via enzymatic decarboxylation in a biphasic organic/aqueous reaction system.
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Acknowledgments
This work was supported by a research grant (no. 31270628) from the National Natural Science Foundation of China, a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, and a Jiangsu postgraduate scientific research and innovation project.
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Hu, H., Li, L. & Ding, S. An organic solvent-tolerant phenolic acid decarboxylase from Bacillus licheniformis for the efficient bioconversion of hydroxycinnamic acids to vinyl phenol derivatives. Appl Microbiol Biotechnol 99, 5071–5081 (2015). https://doi.org/10.1007/s00253-014-6313-3
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DOI: https://doi.org/10.1007/s00253-014-6313-3