Abstract
Occurrence of feruloyl-CoA synthetase (fcs) and enoyl-CoA hydratase (ech) genes responsible for the bioconversion of ferulic acid to vanillin have been reported and characterized from Amycolatopsis sp., Streptomyces sp., and Pseudomonas sp. Attempts have been made to express these genes in Escherichia coli DH5α, E. coli JM109, and Pseudomonas fluorescens. However, none of the lactic acid bacteria strain having GRAS status was previously proposed for heterologous expression of fcs and ech genes for production of vanillin through biotechnological process. Present study reports heterologous expression of vanillin synthetic gene cassette bearing fcs and ech genes in a dairy isolate Pediococcus acidilactici BD16. After metabolic engineering, statistical optimization of process parameters that influence ferulic acid to vanillin biotransformation in the recombinant strain was carried out using central composite design of response surface methodology. After scale-up of the process, 3.14 mM vanillin was recovered from 1.08 mM ferulic acid per milligram of recombinant cell biomass within 20 min of biotransformation. From LCMS-ESI spectral analysis, a metabolic pathway of phenolic biotransformations was predicted in the recombinant P. acidilactici BD16 (fcs +/ech +).
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Acknowledgments
Authors acknowledge Masafumi Noda, Assistant Professor, Hiroshima University, Japan, for providing shuttle vector pLES003. Financial assistance is provided by UGC, New Delhi, India as a major research project entitled “Metabolic engineering of LAB isolate for biotransformation of ferulic acid to vanillin” to Dr. Baljinder Kaur and as a meritorious BSR fellowship to Mr. Debkumar Chakraborty.
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Kaur, B., Chakraborty, D. & Kumar, B. Metabolic engineering of Pediococcus acidilactici BD16 for production of vanillin through ferulic acid catabolic pathway and process optimization using response surface methodology. Appl Microbiol Biotechnol 98, 8539–8551 (2014). https://doi.org/10.1007/s00253-014-5950-x
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DOI: https://doi.org/10.1007/s00253-014-5950-x