The invention discloses
escherichia coli recombinant
bacteria capable of high-producing 2, 5-dimethylpyrazine and a construction method of the
escherichia coli recombinant
bacteria, and belongs to thetechnical field of
gene engineering. According to the
escherichia coli recombinant
bacteria and the construction method thereof, a
genetic engineering method is applied, L-
threonine dehydrogenase TDHis overexpressed in
escherichia coli K-12 capable of high-producing L-
threonine, and
NADH oxidase NoxE derived from
lactococcus microorganisms and aminoacetone oxidase AAOSO derived from
streptococcus microorganisms are expressed in a
heterologous manner, and meanwhile 2-amino-3-ketobutyric acid CoA ligase KBL and primary
amine oxidase TynA are knocked out, so that a novel and efficient 2, 5-dimethylpyrazine synthetic
route is constructed, and the problem of unbalance of cofactors in the recombinant bacteria is solved. By taking
escherichia coli E. coli THR as an example, the accumulation amount of 2, 5-dimethylpyrazine reaches 1.2 + / -0.2 g / L through a 36h shaking flask
fermentation experiment of the recombinant bacteria. According to the method, L-
threonine high-producing strains are used as starting strains, the synthetic
route of 2, 5-dimethylpyrazine in
escherichia coli is successfully reconstructed, the defect of unbalanced
intracellular cofactors is improved, and a new idea is provided for breeding 2, 5-dimethylpyrazine.