Porcine circovirus 3 Cap protein, nucleic acid, virus-like particles, vaccine, and preparation method and application of porcine circovirus 3 Cap protein
A porcine circovirus, virus-like technology, applied in the field of molecular biology, can solve the problems of low VLP expression, complex production process, endotoxin contamination, etc., to improve yeast expression efficiency, no endotoxin contamination, and simple production process. Effect
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[0038] In some preferred embodiments, the present invention also provides a method for preparing the above-mentioned porcine circovirus type 3 Cap protein. The recombinant plasmid is transferred into a yeast strain, and after being expressed by the yeast strain, the porcine circovirus type 3 Cap protein is obtained.
[0039]Using the yeast expression system to express porcine circovirus type 3 Cap protein, compared with the existing baculovirus system expressing PCV3VLP, the production cost is low, the process is simple, the expression level is high, and it is easy to scale up to production; compared with the existing Escherichia coli expression system In comparison, it can express high-quality soluble target protein without endotoxin contamination. Therefore, the preparation method of porcine circovirus type 3 Cap protein provided by the present invention has the advantages of low production cost, simple production process, a large amount of target protein can be obtained thr...
Embodiment 1
[0064] Expression of embodiment 1PCV 3cap protein and assembly of virus-like particle (VLP)
[0065] Through epidemiological investigation and PCV3 virus evolution analysis, the cap protein sequence (SEQ ID NO.1) of a well-conserved and widespread strain was selected.
[0066] (1) About 50 amino acids at the N-terminal of the primary sequence of the PCV3 cap protein are its nuclear localization sequence. In this example, the NLS of the PCV3 cap protein is mutated according to the prediction website (cNLS mapper), and the mutated sequence is predicted by NLS The sequence (SEQ ID NO.2) used was obtained when the predicted site no longer had the characteristics of a nuclear localization sequence. Then carry out codon optimization to its sequence, add base GCCACC (to form KOZAK sequence together with initiation codon ATG) at the 5' end of the nucleic acid sequence after codon optimization, obtain the nucleic acid sequence (SEQ ID NO. 3). This step aims to continuously enhance it...
Embodiment 2
[0082] The preparation of embodiment 2 PCV 3 virus-like particle vaccines
[0083] Using the method described in this application, the purified PCV 3cap protein was emulsified with SEPPIC 206 adjuvant at a volume ratio of 1:1 (see the instructions of SEPPIC 206 for the emulsification method). The content of the emulsified PCV3 virus-like particle (VLP) protein antigen is 50 μg / mL. According to the requirements of the appendix of "Chinese Veterinary Pharmacopoeia" (current version), after the sterility test, viscosity measurement, and stability measurement are qualified, it is placed at 4°C for later use.
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