Recombinant strain for producing L-amino acid, construction method therefor, and application thereof

Abstract

A bacterium for producing L-amino acid has improved expression of a polynucleotide encoding a protein represented by SEQ ID NO: 3 and improved expression of a polynucleotide encoding a protein represented by SEQ ID NO: 31, and/or has mutations in bases at positions −45 bp and −47 bp of a promotor region represented by SEQ ID NO: 57. A polynucleotide, encodes proteins and can be included in a recombinant vector, which can be included in a recombinant strain. These are useful in a method for producing L-amino acid. The polynucleotide encodes a protein which is represented by SEQ ID NO: 3 and has arginine at position 334 substituted by a terminator or encodes a protein which is represented by SEQ ID NO: 31 and has tyrosine at position 592 substituted by phenylalanine, or is formed by mutations in bases at positions −45 bp and −47 bp of a promotor region represented by SEQ ID NO:57.

Dependencies are inferred from the claim text.