Abstract
Ferulic acid decarboxylase (FADase) can catalyze the transformation of ferulic acid into 4-vinyl guaiacol via decarboxylation in microorganisms. In this study, a gene encoding FADase was first isolated from the bacterium Enterobacter sp. Px6-4 using degenerate primers and a genome walking technique. The putative encoding gene (fad) of FADase consists of 507-bp nucleotides, coding a polypeptide of 168 amino acid residues. In addition, a putative gene encoding the transcriptional regulator was identified from the upstream of the fad gene. The deduced peptide sequence of the FADase from Enterobacter sp. Px6-4 showed a 51.2–53.3% sequence identity to decarboxylases from other bacteria. The gene fad was successfully expressed in Escherichia coli BL21, and the recombinant FADase was purified as a protein of ca. 23 kDa with an optimal activity at pH 4.0 and 28 °C. The purified FADase could convert ferulic acid to 4-vinyl guaiacol effectively, and its hydrolytic activity could be inhibited by Cu2+ (99%) and Hg2+ (99.5%). A phylogenetic analysis of the FADase protein from bacteria revealed several different clades. Our result provided a basis for further studies of the ferulic acid transformation pathway and for enhanced production of vanillin in the future.
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This work was funded by the National Natural Science Foundation of China (Approval No. 31060012) and the Department of Science and Technology of Yunnan Province (Approval Nos. 2007C170M, 2006GG22, and 2009CI052).
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Gu, W., Li, X., Huang, J. et al. Cloning, sequencing, and overexpression in Escherichia coli of the Enterobacter sp. Px6-4 gene for ferulic acid decarboxylase. Appl Microbiol Biotechnol 89, 1797–1805 (2011). https://doi.org/10.1007/s00253-010-2978-4
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DOI: https://doi.org/10.1007/s00253-010-2978-4