Abstract
Objectives
To discover novel feruloyl esterases (FAEs) by the function-driven screening procedure from soil metagenome.
Results
A novel FAE gene bds4 was isolated from a soil metagenomic library and over-expressed in Escherichia coli. The recombinant enzyme BDS4 was purified to homogeneity with a predicted molecular weight of 38.8 kDa. BDS4 exhibited strong activity (57.05 U/mg) toward methyl ferulate under the optimum pH and temperature of 8.0 and 37°C. Based on its amino acid sequence and model substrates specificity, BDS4 was classified as a type-C FAE. The quantity of the releasing ferulic acid can be enhanced significantly in the presence of xylanase compared with BDS4 alone from de-starched wheat bran. In addition, BDS4 can also hydrolyze several phthalates such as diethyl phthalate, dimethyl phthalate and dibutyl phthalate.
Conclusion
The current investigation discovered a novel FAE with phthalate-degrading activity and highlighted the usefulness of metagenomic approaches as a powerful tool for discovery of novel FAEs.
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Acknowledgements
This research was supported by the Fundamental Research Funds for the Central Universities (KYYJ201708) and Qing Lan Project of Jiangsu Province.
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The bds4 gene was deposited in the GenBank database with the accession no. MH445495.
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Wu, S., Nan, F., Jiang, J. et al. Molecular cloning, expression and characterization of a novel feruloyl esterase from a soil metagenomic library with phthalate-degrading activity. Biotechnol Lett 41, 995–1006 (2019). https://doi.org/10.1007/s10529-019-02693-3
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DOI: https://doi.org/10.1007/s10529-019-02693-3