Journal
ACS SYNTHETIC BIOLOGY
Volume 11, Issue 2, Pages 900-908Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssynbio.1c00535
Keywords
Candida glycerinogenes; caffeic acid; xylose; pentose phosphate pathway; multi-modular; metabolic engineering
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Funding
- National Natural Science Foundation of China [31970033]
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This study presents a metabolic engineering strategy for the biosynthesis of caffeic acid (CA) in Candida glycerinogenes. By optimizing the pathways and increasing carbon flux, a high yielding strain was obtained, achieving a higher CA yield from mixed sugar compared to glucose. This research highlights the advantages of using mixed sugar as a carbon source for the high yield production of CA.
Caffeic acid (CA), a natural phenolic compound, has important medicinal value and market potential. In this study, we report a metabolic engineering strategy for the biosynthesis of CA in Candida glycerinogenes using xylose and glucose. The availability of precursors was increased by optimization of the shikimate (SA) pathway and the aromatic amino acid pathway. Subsequently, the carbon flux into the SA pathway was maximized by introducing a xylose metabolic pathway and optimizing the xylose assimilation pathway. Eventually, a high yielding strain CG19 was obtained, which reached a yield of 4.61 mg/g CA from mixed sugar, which was 1.2-fold higher than that of glucose. The CA titer in the 5 L bioreactor reached 431.45 mg/L with a yield of 8.63 mg/g of mixed sugar. These promising results demonstrate the great advantages of mixed sugar over glucose for high yield production of CA. This is the first report to produce CA in C. glycerinogenes with xylose and glucose as carbon sources, which developed a promising strategy for the efficient production of high-value aromatic compounds.
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