Mammalian pro-protein converting enzyme

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/57 (2006.01) A61K 31/70 (2006.01) C07H 21/04 (2006.01) C07K 7/06 (2006.01) C07K 7/08 (2006.01) C07K 14/16 (2006.01) C07K 16/40 (2006.01) C12N 9/64 (2006.01) C12N 15/88 (2006.01) C12P 21/06 (2006.01) C12Q 1/68 (2006.01) G01N 33/573 (2006.01) A61K 48/00 (2006.01)

Patent

CA 2227988

This invention relates to a novel and seventh member of the subtilisin-kexin family isolated from rat, which has been named rPC7. The rat spleen cDNA has been totally sequenced. A shorter DNA sequence has been obtained for human, which corresponds to a portion of the catalytic region of a human pro-hormone convertase corresponding to the rat pro-hormone convertase. PC7 clearly distinguishes from the other mammalian members of the subtilisin-kexin family. Its tissue distribution is ubiquitous, but its presence is particularly remarkable in lymphoid tissues. It is present in LoVo cells that are able to cleave the HIV gp160 protein into active gp120/gp41 proteins and that are deficient in other effective pro-hormone convertases known up to date. It is proposed that PC7 is a good candidate as a maturation enzyme responsible for the conversion of HIV gp160 protein in target CD+4 cells. Therefore, silencing the expression of PC7 would lead to the inhibition of the activation of gp160.

Cette invention se rapporte à un nouveau et septième membre de la famille de la subtilisine-kexine isolée chez le rat et qui a été surnommé rPC7. L'ADN complémentaire de la rate du rat a été entièrement séquencé. Une séquence d'ADN plus courte a été obtenue pour les humains et elle correspond à une partie de la région catalytique d'une convertase prohormonale humaine correspondant à la convertase prohormonale du rat. La PC7 se distingue clairement des autres membres mammaliens de la famille de la subtilisine-kexine. Sa distribution dans les tissus se fait de manière générale et omniprésente, mais sa présence est particulièrement remarquable dans les tissus lymphatiques. Elle est présente dans les cellules LoVo capables de couper la protéine gp160 du VIH en protéines actives gp120/gp41 et qui présentent des insuffisances pour d'autres convertases efficaces prohormonales connues à ce jour. On pense que la PC7 peut se révéler être un bon candidat en tant qu'enzyme de maturation responsable de la conversion de la protéine gp160 du VIH dans des cellules cibles CD?+4¿. Par conséquent, neutraliser l'expression de la PC7 conduirait à inhiber l'activation de la protéine gp160.

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