Procedure for expressing a tbpb protein on the bacterial...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/31 (2006.01) A61K 39/095 (2006.01) A61K 39/116 (2006.01) A61P 37/04 (2006.01) C07K 14/22 (2006.01) C12N 15/63 (2006.01) C12N 15/74 (2006.01) C12P 21/02 (2006.01) C12Q 1/68 (2006.01)

Patent

CA 2668883

A procedure for obtaining the expression of a membrane antigen of a pathogen against which an live oral vaccine development is desirable on the surface of a negative Gram bacteria to which virulence is attenuated, or another bacteria or other Gram negative or positive bacteria with probiotic features which are compatible with the proposed expression system and that can be used as a live oral vaccine, wherein a plasmid is constructed and obtained based on the structure of pET family plasmids, with tbpB gene incorporated under the control of T7 promoter or another equivalent one, with the addition of a metabolic marker in the plasmid vector, previously cloned with its own promoter, inactivating, at the same time, the antibiotic resistance. In addition, recombinant microorganism such as an attenuated vaccine strain against group B meningitis with immunizing and protective properties against infection by Neisseria meningitides.

L'invention porte sur un procédé d'obtention de l'expression d'un antigène de membrane de pathogènes contre lequel il est désirable de développer un vaccin oral vivant à la surface de bactéries de Gram négatives dont la virulence est atténuée, ou d'autre bactéries Gram négatives ou positives à caractéristiques probiotiques compatibles avec le système d'expression proposé et pouvant être utilisées comme vaccin oral vivant. À cet effet on élabore un plasmide basé sur la structure des plasmides de la famille pET, un gène tbpB étant incorporé sous le contrôle du promoteur T7 ou d'un équivalent, et avec adjonction d'un marqueur métabolique dans le vecteur du plasmide précédemment cloné avec son propre promoteur, inactivant en même temps, la résistance antibiotique. On obtient de plus des micro-organismes recombinants tels qu'une souche de vaccin atténué contre les méningites du groupe B avec en outre une immunisation et des propriétés protectrices contre l'infection par le Neisseria meningitis.

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