FIELD: biotechnology.
SUBSTANCE: polypeptide involved in the production of L-valine consisting of the amino acid sequence represented by SEQ ID NO is proposed: 1 in which alanine being the amino acid corresponding to position 156 of SEQ ID NO: 3, replaced by isoleucine. Also a polynucleotide encoding the said protein, a microorganism Escherichia coli that produces L-tryptophan and contains the said protein or a polynucleotide encoding the said protein, and a method for producing L-tryptophan are proposed.
EFFECT: increasing the yield of L-tryptophan.
5 cl, 1 tbl, 2 ex
