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The expression of the feedback inhibition-insensitive enzyme cyclohexadienyl dehydrogenase (TyrC) fromZymomonas mobilis and the chorismate mutase domain from native chorismate mutase-prephenate dehydratase (PheACM ) fromEscherichia coli was compared to the expression of native feedback inhibition-sensitive chorismate mutase-prephenate dehydrogenase (CM-TyrAp ) with regard to the capacity to producel -tyrosine inE. coli strains modified to increase the carbon flow to chorismate. Shake flask experiments showed that TyrC increased the yield ofl -tyrosine from glucose (Yl -Tyr/Glc) by 6.8-fold compared to the yield obtained with CM-TyrAp . In bioreactor experiments, a strain expressing both TyrC and PheACM produced 3 g/liter ofl -tyrosine with aYl -Tyr/Glcof 66 mg/g. These values are 46 and 48% higher than the values for a strain expressing only TyrC. The results show that the feedback inhibition-insensitive enzymes can be employed for strain development as part of a metabolic engineering strategy forl -tyrosine production.

applied and environmental microbiology

Metabolic Engineering of <i>Escherichia coli</i> for <scp>l</scp> -Tyrosine Production by Expression of Genes Coding for the Chorismate Mutase Domain of the Native Chorismate Mutase-Prephenate Dehydratase and a Cyclohexadienyl Dehydrogenase from <i>Zymomonas mobilis</i>

Metabolic Engineering of Escherichia coli for l -Tyrosine Production by Expression of Genes Coding for the Chorismate Mutase Domain of the Native Chorismate Mutase-Prephenate Dehydratase and a Cyclohexadienyl Dehydrogenase from Zymomonas mobilis