Pcv2 immunogenic compositions and methods of producing such...

C - Chemistry – Metallurgy – 12 – Q

Patent

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C12Q 1/68 (2006.01)

Patent

CA 2592735

An improved method for recovering the protein expressed by open reading frame (2) from porcine circovirus type (2) is provided. The method generally involves the steps of transfecting recombinant virus containing open reading frame (2) coding sequences into cells contained in growth media, causing the virus to express open reading frame (2), and recovering the expressed protein in the supernate. This recovery should take place beginning approximately (5) days after infection of the cells in order to permit sufficient quantities of recombinant protein to be expressed and secreted from the cell into the growth media. Such methods avoid costly and time consuming extraction procedures required to separate and recover the recombinant protein from within the cells.

L'invention concerne un procédé amélioré permettant de récupérer la protéine exprimée par un cadre de lecture ouvert 2 provenant d'un circovirus porcin de type 2. Ledit procédé consiste généralement à transfecter un virus de recombinaison contenant un cadre de lecture ouvert 2 codant pour des séquences à l'intérieur de cellules contenues dans un milieu de croissance, ce qui entraîne le virus à exprimer un cadre de lecture ouvert 2 et à récupérer la protéine exprimée dans le surnageant. Le début de cette récupération devrait s'effectuer approximativement 5 jours après l'infection des cellules afin de permettent l'expression de quantités suffisantes de protéine de recombinaison et leur sécrétion à partir de la cellule du milieu de croissance. Ces procédés évitent les procédures d'extraction coûteuses et consommatrices de temps nécessaires pour séparer et récupérer la protéine de recombinaison provenant de l'intérieur des cellules.

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