The invention provides a recombinant
engineering bacterium for efficiently expressing a
liraglutide precursor and an application of the recombinant
engineering bacterium. According to the invention, asignal
peptide and an enterokinase
restriction enzyme cutting site are designed at the N end of a
liraglutide precursor molecule Arg34G LP-1 (7-37), the C end is connected with termination codon, a
target gene is formed, then, the
target gene is inserted between two
restriction enzyme cutting sites of an
expression vector; the recombinant
engineering bacterium for expressing the
liraglutide precursor is constructed, the engineering bacterium is subjected to high-density
fermentation culture and is expressed in the form of an inclusion body of a
fusion protein, the expression quantity of the recombinant
fusion protein is high, the recombinant
fusion protein accounts for about 25%-35% of the
total protein of the bacterium, and the expression quantity of the inclusion body of a
target protein reaches 15-20g / L. The inclusion body is low in
impurity protein content, beneficial to separation and purification, and high in purification efficiency and good in stability, the production cost isgreatly reduced, the production efficiency is improved, and the inclusion body has the good application prospect in the field of
diabetes treatment medicine preparation.