The present invention belongs to the technical field of biological
genetic engineering, and specifically relates to a long-acting recombinant canine
insulin fusion protein and its preparation method and application. The
fusion protein formed by connecting
proinsulin and 7p has high
biological activity, and the recombinant canine long-acting
insulin is co-expressed in an
Escherichia coli expression
system using a molecular chaperone, and a high-purity soluble
target protein is obtained through denaturation, renaturation and purification. The
target protein is mainly located in the supernatant, avoiding the formation of
inclusion bodies, simplifying the purification process, and optimizing the induced expression conditions, so that the proportion of soluble
protein is significantly increased, and the
protein is mainly located in the supernatant. The high expression amount and high purity
fusion protein obtained by final purification have good
biological activity, which solves the problems of difficulty in obtaining animal
insulin, short half-life
in vivo and easy to cause immune response. The long-acting recombinant canine insulin expressed by the present invention provides a more suitable
treatment plan for canine
diabetes treatment, and has industrialization prospects.