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Alternative fermentation pathway of cinnamic acid production via phenyllactic acid

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Abstract

Cinnamic acid (CA) is the chemical basis for bulk production of flavoring reagents and chemical intermediates, and it can be fermented from biomass. Phenylalanine ammonia lyase (PAL) has been used exclusively in the bacterial fermentation of sugar biomass in which the fermentation intermediate phenylalanine is deaminated to CA. Here, we designed an alternative metabolic pathway for fermenting glucose to CA. An Escherichia coli strain that generates phenylalanine in this pathway also produces Wickerhamia fluorescens phenylpyruvate reductase and ferments glucose to d-phenyllactate (d-PhLA) (Fujita et al. Appl Microbiol Biotechnol 97: 8887–8894, 2013). Thereafter, phenyllactate dehydratase encoded by fldABCI genes in Clostridium sporogenes converts the resulting d-PhLA into CA. The phenyllactate dehydratase expressed by fldABCI in the d-PhLA-producing bacterium fermented glucose to CA, but d-PhLA fermentation and phenyllactate dehydration were aerobic and anaerobic processes, respectively, which disrupted high-yield CA fermentation in single batch cultures. We overcame this disruption by sequentially culturing the two strains under aerobic and anaerobic conditions. We optimized the incubation periods of the respective aeration steps to produce 1.7 g/L CA from glucose, which exceeded the yield from PAL-dependent glucose fermentation to CA 11-fold. This process is a novel, efficient alternative to conventional PAL-dependent CA production.

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Acknowledgments

We thank Norma Foster for critical reading of the manuscript. This study was supported by the Advanced Low Carbon Technology Research and Development Program (5100270) from the Japan Science and Technology Agency [JST-ALCA].

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Correspondence to Naoki Takaya.

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The authors declare that they have no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Shunsuke Masuo and Yuta Kobayashi contributed equally to this work as first authors.

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Masuo, S., Kobayashi, Y., Oinuma, KI. et al. Alternative fermentation pathway of cinnamic acid production via phenyllactic acid. Appl Microbiol Biotechnol 100, 8701–8709 (2016). https://doi.org/10.1007/s00253-016-7623-4

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  • DOI: https://doi.org/10.1007/s00253-016-7623-4

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