Fig. 3

Metabolite production of recombinant C. glutamicum H36GD13032, C. glutamicum H36GD1447, and C. glutamicum H36GD1852 expressing glutamate decarboxylase, xylose isomerase, and xylulose kinase under the strong H36 promoter, after 72 and 120 h of flask cultivation in medium containing different combinations of carbon sources: (a 50 g/L glucose; b 40 g/L glucose and 10 g/L xylose; c 30 g/L glucose and 20 g/L xylose; d 20 g/L glucose and 30 g/L xylose. Glutamate, green; Gamma-aminobutyrate, violet; 72 h, solid bar; 120 h, open bar)