Fig. 4.

Comparison of glucose (Glc) and GlcNAc as a carbon source for producing tyrosine. Two carbon source concentrations were used: 10 g/L (A, C, and E) and 20 g/L (B, D, and F). (A and B) Tyrosine titer at 72 h achieved with different amounts of carbon source and phosphate. (C and D) Concentration of residual carbon source at 72 h. (E and F) Acetate (byproduct) titer at 72 h. The strain carrying plasmid NP19 was used. Ammonium salts were added to the glucose-based media to match the nitrogen concentration in the GlcNAc media in which GlcNAc was the only nitrogen source. The detailed composition of the media used in this part can be found in SI Appendix, Table S1. Error bars indicate SE (n = 3).