The invention discloses a method for producing
eriodictyol by reforming
escherichia coli in
metabolic engineering, belonging to the field of
metabolic engineering. The step of transforming
naringenin into the
eriodictyol is successfully realized through a
gene engineering technology by carrying out fusion expression on two genes, namely a flavone 3'
hydroxylase gene tF3'H with a
membrane binding sequence
cut and a P450
reductase gene tCPR, in
escherichia coli. A
tyrosine ammonia lyase gene TAL from R.glutinis, 4-coumarate:
coenzyme A ligase gene 4CL from P.crispum, a
chalcone synthase gene CHS from P.hybrida and a
chalcone isomerase gene CHI from M.sativa are simultaneously expressed to realize that
naringenin is directly produced through
tyrosine, so that an engineered strain for directly producing
eriodictyol through
tyrosine is established. According to the method, in order to increase the output of eriodictyol, an acetokinase ackA gene contained in an
escherichia coli
genome is removed by being knocked, an
acetyl coenzyme A synthetase gene acs and an
acetyl coenzyme A carboxylase gene ACC are excessively expressed, and the output of eriodictyol can finally reach 106.7 mg / L.