An expression cassette for efficiently secreting and expressing human fgf21 protein and its application
A technology for expressing cassettes and proteins, which is applied in the biological field and can solve the problems of large consumption, unfavorable energy saving and emission reduction, slow growth, etc.
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[0038] 3. Preparation and transformation of DNA:
[0039] DNA was isolated from E. coli and B. subtilis or from agarose gels using DNA preparation kits from Tiangen or Omega according to the manufacturer's instructions. Standard molecular techniques were used in all examples. E. coli was transformed using plasmid DNA as described by Chung C.T. et al., Proc. Natl. Acad. Sci. USA 86, 1989, 21722175. According to the modified "Paris method" (Harwood C.R. Molecular Biological Methods for Bacillus, 1990, John Wiley & Sons Ltd., England), plasmid DNA or DNA fragments were used to transform Bacillus subtilis.
[0040] 4. Bacillus subtilis gene traceless knockout:
[0041] Gene knockout was performed according to the improved "AraR-based Bacillus subtilis gene knockout method" (Liu S, Endo K, et al. Microbiology. 2008; 154(Pt 9): 2562-2570.). First, using the principle of homologous recombination, the spectinomycin resistance gene fragment "Para-spc" carrying the homology arm and r...
Embodiment 1
[0056] Example 1. Construction of rhFGF21 expression cassette containing cistron cistron Optimizing rhFGF21 translation efficiency to promote protein expression level
[0057] 1.1 Design of cistron-containing rhFGF21 expression cassette
[0058] In order to increase the expression level of rhFGF21, the present invention inserts the cistron cistron into the rhFGF21 expression vector to form a rhFGF21 expression cassette containing the cistron cistron. The purpose of inserting cistron is to change the secondary structure of mRNA. RBS is exposed from the original stem-loop structure, which is easy to recruit more ribosomes, enhances the combination of ribosomes and RBS, and improves the translation efficiency of proteins. figure 1 It is a schematic diagram of the structure of the rhFGF21 expression cassette containing the cistron. figure 1 The structure of A is: promoter-RBS-cistron(1-5)-RBS-rhFGF21-terminator, cistron1-cistron5 are the first 18bp of gfp, luc, glvA, rdpe, gsiB g...
Embodiment 2
[0062] Example 2. Helping rhFGF21 to fold correctly by optimizing disulfide bonds to obtain high-yield soluble expression
[0063] The rhFGF21 protein contains a disulfide bond inside. Since the types and expression levels of disulfide bond-related foldases in Bacillus subtilis are relatively low, there are risks such as incorrect formation or formation of misfolded disulfide bonds in the FGF21 protein. Aiming at this situation, the present invention uses the pDL vector (derived from BGSC) as the backbone to clone and construct the integrated vector pDF-d carrying the oxidoreductase DsbA (the construction method is the same as in Example 1) and construct the weakened thioredoxin The carrier ptrx1 of the protein TrxA, that is, the promoter of the gene TrxA is replaced by the promoter P with weaker expression strength spac (construction method is the same as embodiment 1). The vectors pDF-d and ptrx1 were respectively transformed into Bacillus subtilis 1A751, and the mutant str...
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