Hyperproduction of 3,4-dihydroxyphenyl-l-alanine (l-dopa) using erwinia herbicola cells carrying a mutant transcriptional regulator TyrR

Abstract

In the last few decades, enzymatic production of 3,4-dihydroxyphenyl-L- alanine (L-dopa) using tyrosine phenol-lyase (Tpl) has been industrialized. This method has an intrinsic problem of tyrosine contamination because Tpl is synthesized under tyrosine-induced conditions. Herein, we constructed a hyper-L-dopa-producing strain by exploiting a mutant TyrR, an activator of tpl. The highest productivity was obtained for the strain grown under non-induced conditions. It was 30-fold higher than that obtained for tyrosine-induced wild-type cells.