Saccharomyces cerevisiae biofactory to produce naringenin using a systems biology approach and a bicistronic vector expression strategy in flavonoid production

Abstract

ABSTRACT Naringenin is the central flavonoid in the biosynthesis of several bioactive compounds and presents a growing demand for its nutraceutical properties. Naringenin extraction from plants is non-viable due to low yields, and microbial platforms could represent a controlled and sustained alternative to produce it using several metabolic engineering tools. This study shows the naringenin production in Saccharomyces cerevisiae from glucose through a combined approach of systems biology, enzyme criteria selection, and a molecular engineering strategy. In silico prediction using a mixed integer linear programming (MILP) algorithm showed that the phenylpropanoid pathway was the shortest and most viable metabolic pathway. Two biscistronic constructs were generated using the PTV-1 2A peptide sequence, and a naringenin biofactory was assembled with the phenylalanine ammonia-lyase/tyrosine ammonia-lyase genes encoding phenylalanine/tyrosine ammonia-lyase (Rhodobacter capsulatus), 4-coumaroyl (4 Cl) encoding a p-coumaroyl-CoA ligase (Solanum lycopersicum), CHS encoding chalcone synthase (Hypericum androsaemum), and CHI encoding a chalcone isomerase (Glycine max). Naringenin productivity in batch fermentation was about 40.67 ± 3.47 µg/Lh with a 6.10 ± 0.52 mg/L titer (22.41 ± 1.91 µM) and a 3.26 ± 1.36 mg/g yield (Y P/S ) with the detection of additional flavonoids. The obtained concentration is better than other related works in diverse engineered microorganisms. The results suggest a successful and optimizable alternative for the heterologous flavanone production in yeast combined with bicistronic expression mediated by a 2A peptide sequence for the first time. This strategy supports the production of extensive routes for other nutraceutical compounds. IMPORTANCE Flavonoids are a group of compounds generally produced by plants with proven biological activity, which have recently beeen recommended for the treatment and prevention of diseases and ailments with diverse causes. In this study, naringenin was produced in adequate amounts in yeast after in silico design. The four genes of the involved enzymes from several organisms (bacteria and plants) were multi-expressed in two vectors carrying each two genes linked by a short viral peptide sequence. The batch kinetic behavior of the product, substrate, and biomass was described at lab scale. The engineered strain might be used in a more affordable and viable bioprocess for industrial naringenin procurement.

Keywords

• naringenin
• S. cerevisiae
• 2A peptide
• systems biology
• bicistronic vector