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coli and then purified to detect its enzymatic activity in vitro. Consequently, 55.33 ± 0.88 mg/L of PAL-opt protein with a specific activity of 1,219 ± 147 U/mg and Km value of 609 μM for substrate L-phenylalanine was easily obtained. The enzyme protein also displayed tyrosine ammonia lyase (TAL)-specific activity of 80 ± 2 U/mg and Km value of 13.3 μM for substrate L-tyrosine. The bifunctional enzyme RgPAL/TAL (PAL-opt) and its easy expression advantage will provide an important basis for further applications.Background The purpose