The invention belongs to the
molecular biology field, and discloses an optimized PCV2d ORF2
gene and a preparation method of
virus-like particles of the optimized PCV2d ORF2
gene. After a coding genesequence for coding
porcine circovirus 2d subtype Cap proteins is optimized, an expression
engineering bacteria expression
system is constructed and is used for expressing the Cap proteins. Expressionbacteria is capable of expressing a large number of dissoluble and active
porcine circovirus 2d subtype Cap proteins under a proper expression condition, the expressed proteins are purified by virtueof a
monoclonal antibody column, and then the high-purity and high-concentration Cap proteins are obtained and are capable of forming the
virus-like particles. According to the preparation method, efficient soluble expression of the
porcine circovirus 2d subtype full-length Cap proteins in a
prokaryotic expression system is realized, the operation is simple, the cost is low, the prepared
monoclonal antibody column can be repeatedly used, and the Cap proteins obtained through purification are high in concentration and purity, are capable of spontaneously forming the
virus-like particles, havegood
immunogenicity and are suitable for industrial application.