Fig. 2From: Metabolic engineering of Escherichia coli for efficient production of L-5-hydroxytryptophan from glucoseMetabolic pathway designs and key metabolic engineering strategies for 5-HTP production in E. coli. The orange arrows indicate the overexpression of relevant endogenous genes in the chassis cells through chromosome integration or promoter replacement. The black arrows with “//” indicate the deletion of the relevant genes. The green arrows indicate the introduction of the relevant heterologous genes. Three arrows in series indicate a multi-step reactionBack to article page