Phage display using cotranslational translocation of fusion...

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/10 (2006.01)

Patent

CA 2614512

The present invention relates to a filamentous phage display method wherein the polypeptides of interest displayed on the phage particle are cotranslationally translocated across the cytoplasmic membrane of Gram- negative bacteria based on the signal recognition particle pathway. This method is particularly suitable for polypeptides, which are known to be difficult to display on phages, and for proteins of cDNA libraries and other combinatorial libraries, in particular when derived from very fast folding, stable protein scaffolds. The invention further relates to phage or phagemid vectors useful in the method comprising a gene construct coding for a fusion polypeptide comprising the polypeptide to be displayed on the phage particle and an N-terminal signal sequence promoting cotranslational translocation.

L'invention concerne un procédé d'affichage de phage filamenteux selon lequel les polypeptides d'intérêt affichés sur la particule de phage sont translocatés de manière cotranslationnelle sur la membrane cytoplasmique de bactéries Gram-négatives en fonction de la voie de la particule de reconnaissance du signal. Ce procédé s'avère particulièrement utile pour des polypeptides reconnus comme étant difficiles à afficher sur des phages, et pour des protéines de bibliothèques d'ADNc et d'autres bibliothèques combinatoires, en particulier lorsqu'elles sont dérivées d'échafaudages protéiniques stables, à repliement très rapide. L'invention concerne en outre des vecteurs phages ou phagemides utiles dans ledit procédé qui comprennent une construction génique codant pour un polypeptide de fusion comportant le polypeptide à afficher sur la particule de phage et une séquence signal N-terminale favorisant une translocation cotranslationnelle.

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