Fig. 6.
Effect of lipid modifications on the efflux of lupeol during two-phase fermentation. a Schematic representation of two-phase extractive fermentation. b Ratio of the extra/intracellular lupeol content after 120 h of fermentation, calculated based on the lupeol titer as shown in Additional file 1: Fig. S5. c Effect of lipid modifications on cell growth. d Lupeol productivity after 120 h of fermentation. These results indicated that the efflux of lupeol was enhanced and ultimately improved cell growth and the capacity of lupeol synthesis in engineered strains. Error bars represent ± SD of biological triplicates