Patent ID: 7319026

Claim:
An amino acid-producing recombinant bacterium from the Enterobacteriaceae family, wherein said bacterium produces L-threonine and comprises: (a) at least one stop codon located in the coding region of a nucleotide sequence which codes for the σ s factor having the amino acid sequence of SEQ ID NO:2, wherein said stop codon is selected from the group consisting of: amber; ochre; and opal; and wherein said stop codon lies within the coding region of said nucleotide sequence at a position corresponding to any one of positions 2-314 in the amino acid sequence of the protein of SEQ ID NO:2; (b) at least one suppressor corresponding to said stop codon and selected from the group consisting of: an amber suppressor; an ochre suppressor; and an opal suppressor; and (c) increased activity of homoserine dehydrogenase compared to an unmodified bacterium from said Enterobacteriaceae family.