The present invention provides a construction method for efficient
biosynthesis of streptomycete drugs. The construction method comprises: based on an inducible
promoter O[R]O[lac] and a strong
promoter ermEp<*>, firstly constructing a gradient induction expression
system in streptomycete; controlling the expression level of
target gene through the gradient induction, and carrying out coupled analysis on the relationship between the expression level of the
target gene and the yield of the
target drug so as to reveal the rate-limiting reaction in the
drug biosynthesis path and the suitability of the rate-limiting
enzyme; and through a constitutive
promoter ermEp<*>, rationally carrying out series
coupling on the encoding genes highly expressing the relevant rate-limiting
enzyme so as to obtain a strain of the high-yield S Chattanoogensis producing strain L12, and transporting the strain to the China General
Microbiological Culture Collection Center to preserve, wherein the preservation number is CGMCC No.10157. According to the present invention, the
shake flask fermentation results show that the
Natamycin yield in the S Chattanoogensis L12 is 3.3 times the yield in the S Chattanoogensis L10, and the 50 L
fermentation tank small test results show that the highest yield achieves 15.7 g / L; and the method of the present invention has characteristics of efficiency, accuracy and simple operation, and is generally suitable for other streptomycetes.