Scalable fermentation process

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 7/02 (2006.01) C12P 21/02 (2006.01)

Patent

CA 2608579

This invention provides a robust fermentation process for the expression of a capsid protein of a bacteriophage which is forming a VLP by self-assembly, wherein the process is scalable to a commercial production scale and wherein the expression rate of the capsid protein is controlled to obtain improved yield of soluble capsid protein. This is achieved by combining the advantages of fed-batch culture and of lactose induced expression systems with specific process parameters providing improved repression of the promoter during the growth phase and high plasmid retention throughout the process.

L'invention se rapporte à un procédé de fermentation robuste permettant d'exprimer une protéine de capside d'un bactériophage formant une VLP par auto-assemblage. Le procédé selon l'invention peut être élargi à une échelle de production commerciale et consiste à contrôler le taux d'expression de la protéine de capside pour obtenir un meilleur rendement de la protéine de capside soluble. A ces fins, on associe les avantages de la culture à écoulement discontinu et les avantages des systèmes d'expression avec induction par le lactose, à des paramètres de traitement spécifique conduisant à une répression améliorée du stimulateur pendant la phase de croissance et à une rétention plasmidique élevée tout au long du procédé.

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