mutant small subunit of bacterial acetolactate synthase (ahas i), mutant acetolactate synthase, dna, bacterium of the enterobacteriaceae family, and method for producing a branched chain l-amino acid

摘要

mutant small subunit of bacterial acetolactate synthase (ahas 1), mutant acetolactate synthase, dna, bacterium of the enterobacteriaceae family, and method for producing a branched chain 1-amino acid a mutant bacterial acetolactate synthase (ai-1) that is resistant to Inhibition of l-valine feedback is described. Also described is a method for producing branched chain 1-amino acids using a bacterium of the enterobacteriaceae family wherein the 1-amino acid productivity of said bacterium is improved by the use of acetolactate synthase (ai-1) which is resistant to feedback inhibition. by l-valine. This acetolactate synthase contains a small mutant subunit encoded by the mutant ilvn gene.