Fig. 2From: Optimization of trans-4-hydroxyproline synthesis pathway by rearrangement center carbon metabolism in Escherichia colia Shake flask fermentation results of strain Pro-1–Pro-5. b Effects of T-4-HYP expression elements on T-4-HYP fermentation. c Effects of enrichment precursors on T-4-HYP production and cell growth. d The effect of enrichment precursors on by-products. e Shake flask fermentation studies of strain HYP-5–HYP-7-1Back to article page