L-rhamnose-inducible expression systems

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/63 (2006.01) C12N 15/70 (2006.01)

Patent

CA 2506999

The invention relates to methods for expressing nucleic acid sequences in prokaryotic host cells. According to said methods, at least one DNA construct that can be episomally replicated in said host cells and comprises a nucleic acid sequence that is to be expressed is introduced into the host cells under the transcriptional control of an L-rhamnose-inducible promoter, said promoter being heterologous relative to said nucleic acid sequence, and expression of the nucleic acid sequence is induced by adding R-rhamnose. The inventive methods are characterized by the fact that the prokaryotic host cell used is at least deficient in an L-rhamnose isomerase.

L'invention concerne un procédé permettant d'exprimer des séquences d'acides nucléiques dans des cellules hôtes procaryotes. Au moins une structure ADN réplicable de manière épisomique dans lesdites cellules hôtes, comprenant une séquence d'acides nucléiques à exprimer, est introduite dans lesdites cellules hôtes par contrôle transcriptionnel d'un promoteur pouvant être induit par un L-rhamnose, ledit promoteur étant hétérologue par rapport à la séquence d'acides nucléiques. L'expression de ladite séquence d'acides nucléiques est induite par addition d'un L-rahmnose. Le procédé de l'invention est caractérisé en ce que la cellule hôte procaryote est au moins déficiente par rapport à une L-rahmnose isomérase.

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