Dna sequence coding for a polypeptide which enhances virus...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/34 (2006.01) A01N 63/00 (2006.01) A01N 63/02 (2006.01) C07K 14/01 (2006.01) C12N 7/01 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2227308

This disclosure relates to an isolated and cloned DNA from a granulovirus virus which comprises an amino acid sequence of the viral gene encoding a polypeptide isolated from occlusion bodies of certain baculoviruses and which polypeptide possesses the biological activity of enhancing baculovirus infectivity. Such proteins termed herein as "enhancins" are found within the viral occlusion body, have a disruptive effect on the insect peritrophic membrane (PM) proteins, and/or interact with the midgut epithelium in such a manner as to permit the increased adsorption, penetration and uptake of virus particles by midgut cells with a concomitant increase in host mortality. Disclosed herein is a recombinant DNA sequence which codes for the enhancin protein of the Helicoverpa armigera granulovirus virus. The DNA sequence is shown in SEQ. ID. NO. :1 and the open reading frame is shown in SEQ. ID. NO.: 1: base pairs 271-2976. The amino acid sequence of the enhancin protein is shown in SEQ. ID. NO.: 2.

L'invention concerne un ADN cloné et isolé d'un virus à granulovirus qui comprend une séquence amidoacide du gène viral codant un polypeptide isolé à partir de corps occlusifs de certains baculovirus, ce polypeptide possédant l'activité biologique de stimuler l'infectivité du baculovirus. De telles protéines, dénommées ici "stimulantes", se trouvent dans le corps occlusif viral, exercent un effet perturbateur sur les protéines de la membrane péritrophique de l'insecte, et/ou interagissent avec l'épithélium de l'intestin moyen de façon à provoquer une adsorption, une pénétration et une assimilation accrues des particules du virus par les cellules de l'intestin moyen, entraînant une mortalité de l'hôte plus élevée. L'invention se rapporte également à une séquence d'ADN recombinée qui code pour la protéine stimulante du virus à granulovirus Helicoverpa armigera. La séquence d'ADN est représentée par SEQ. ID. NO.: 1, et le cadre de lecture ouvert est représenté par SEQ. ID. NO.: 1: paires de bases 271-2976. La séquence aminoacide de la protéine stimulante est représentée par SEQ. ID. NO.: 2.

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