Fig. 3From: Optimization of trans-4-hydroxyproline synthesis pathway by rearrangement center carbon metabolism in Escherichia colia Effect of SucAB gene controlled by different promoters on T-4-HYP fermentation. b Relative transcription level of SucAB gene in four strains with different culture times. c Effect of adding α-ketoglutrate on T-4-HYP fermentation. d Effect of xfp gene from different sources on T-4-HYP production. e Comparison of fermentation performance between strains HYP-6-1 and HYP-7-1Back to article page