Expression of self-processing polyproteins in transgenic plants

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/82 (2006.01) C07K 14/09 (2006.01) C12N 9/50 (2006.01) C12N 15/42 (2006.01) C12N 15/62 (2006.01)

Patent

CA 2176209

A method for the expression of multiple proteins in a transgenic plant comprising inserting into the genome of the plant a gene construct comprising a 5' -region which includes a promoter which is capable of initiating transcription of a structural gene under the control thereof, a protein encoding sequence coding for more than one protein and a 3 ' -terminator region which includes a polyadenylation signal, each of the said protein encoding sequences being separated from an adjacent protein encoding sequence by a DNA sequence which on translation provides a cleavage site whereby the expressed polyprotein is post-transitionally processed into the component protein molecules. The DNA sequence which encodes the post-translation cleavage site may be derived from a virus, particularly a picornavirus. In a preferred embodiment the DNA sequence providing the cleavage site encodes the amino acid sequence NFDLlkLAGDVESNPGPFF.

L'invention se rapporte à un procédé utilisé pour l'expression d'une famille de protéines dans une plante transgénique et qui consiste à insérer dans le génome de la plante un gène chimère comprenant une région 5' qui possède un promoteur capable de déclencher la transcription d'un gène structural sous la commande de celui-ci, une séquence de codage de protéines codant pour plusieurs protéines et une région à terminateur 3' qui comporte un signal de polyadénylation, chacune des séquences de codage de protéines étant séparée d'une séquence de codage adjacente par une séquence d'ADN qui, lors de la traduction, crée un site de clivage. La polyprotéine exprimée évolue de manière post-traductionnelle dans les molécules protéiques des composants. La séquence d'ADN qui code le site de clivage post-traductionnel peut être dérivée d'un virus, notamment un picornavirus. Dans un mode préféré de réalisation, la séquence d'ADN créant le site de clivage code la séquence d'aminoacides NFDLLKLAGDVESNPGPSFF.

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