A new ribosome-inactivating protein isolated from the plant...

C - Chemistry – Metallurgy – 12 – N

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Details

C12N 15/29 (2006.01) A61K 38/16 (2006.01) A61K 47/48 (2006.01) C07K 14/415 (2006.01) C07K 19/00 (2006.01) C12N 15/62 (2006.01) C12N 15/63 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2174943

The present invention discloses a new ribosome-inactivating protein, bryodin 2, isolated from the plamt Bryonia dioica. This ribosome- inactivating protein (RIP) is a type I RIP having a single polypeptide chain and no cellular receptor domain. Like many type I RIPs, bryodin 2 has a molecular weight of about 27,000 daltons and pI of 9.5. Bryodin 2 differs from previously identified ribosome-inactivating protein in its amino acid composition, amino acid sequence, and toxicity in vitro and in vivo. Bryodin 2 is useful, as are other type I ribosome- inactivating proteins, as am abortifacient, immunomodulator, anti-tumor or anti-viral agent. Compositions comprising bryodin 2 as am immunoconjugate or fusion molecule are particularly useful to kill cells of a target population.

La présente invention concerne une nouvelle protéine inactivant les ribosomes, la bryodine 2, isolée à partir de la plante Bryonia Dioica. Cette protéine inactivant les ribosomes (RIP) est une RIP type I présentant une seule chaîne polypeptidique et aucun domaine récepteur cellulaire. Comme bon nombre de RIP de type I, la bryodine 2 présente une masse moléculaire d'environ 27 000 daltons et un point isoélectrique de 9,5. La bryodine 2 diffère de la protéine inactivant les ribosomes précédemment identifiée par sa composition d'acides aminés, sa séquence d'acides aminés et sa toxicité in vitro et in vivo. La bryodine 2, comme les autres protéines inactivant les ribosomes de type I peut être utilisée comme agent abortif, immunomodulateur, anti-tumoral ou anti-viral. Les compositions comprenant de la bryodine 2 comme immunoconjugué ou molécule de fusion sont particulièrement utiles pour tuer les cellules d'une population cible.

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