Process for producing L-tryptophan, L-tyrosine or L-phenylalanine

摘要

Disclosed is a process for producing an aromatic amino acid selected from the group consisting of L-tryptophan, L-tyrosine and L- phenylalanine which comprises culturing in a medium a mutant strain of the genus Corynebacterium or Brevibacterium, being capable of producing the aromatic amino acid and also having higher transketolase activity than that of a parent strain thereof until the aromatic amino acid is produced and accumulated in the culture, and recovering the aromatic amino acid therefrom.