Novel component of von hippel-lindau tumor suppressor...

C - Chemistry – Metallurgy – 07 – K

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C07K 1/00 (2006.01) A21C 3/06 (2006.01) A21C 3/08 (2006.01) B28B 11/08 (2006.01) B28B 21/48 (2006.01) B28B 21/98 (2006.01) B29C 53/00 (2006.01) B29C 53/14 (2006.01) C07K 14/00 (2006.01) C07K 14/47 (2006.01) C07K 17/00 (2006.01) C12N 5/00 (2006.01) C12N 5/02 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2362520

Rbx1, an evolutionarily conserved Cullin-interacting RING-H2 finger protein, has been discovered. Mammalian Rbx1 has been identified as a component of the CUL2-containing VHL complex. An Rbx1 homolog from S. cerevisiae has also been identified as a subunit and activator of the Cdc53-containing SCFCdc4 ubiquitin ligase required for ubiquitination of the cdk inhibitor Sicl and for the G1/S cell cycle transition in yeast, providing a link between the multiprotein VHL tumor suppressor complex and cellular ubiquitination. The Rbx1 protein acts as a cellular marker useful (1) in detecting a possible predisposition to certain carcinomas, (2) as a molecular target for treating those carcinomas therapeutically, (3) as a target for inhibition by drugs that manipulate the growth of cells, and (4) as a research tool to better understand the various complex mechanisms of cell ubiquitination, binding of certain activator proteins, fibronectin deposition and other aspects of the cellular division process.

L'invention concerne Rbx1, une protéine à doigt RING-H2 conservée au cours de l'évolution, interagissant avec Cullin. Rbx1 de mammifère à été découverte en tant que composant du complexe VHL contenant CUL2. Un homologue de Rbx1, obtenu à partir de S. cerevisiae a également été identifié en tant que sous-unité et activateur de SCF?Cdc4¿ ubiquitine ligase contenant Cdc53, nécessaire à l'ubiquitination de l'inhibiteur Sic1 de cdk ainsi qu'à la transition du cycle cellulaire G1/S des levures, assurant une liaison entre le complexe suppresseur de tumeur VHL multiprotéique et l'ubiquitination cellulaire. La protéine Rbx1 agit en tant que marqueur cellulaire, utile (1) afin de détecter une éventuelle prédisposition à certains carcinomes, (2) en tant que cible moléculaire en vue de traiter ces carcinomes de manière thérapeutique, (3) en tant que cible pour l'inhibition par des médicaments agissant sur la croissance cellulaire, et (4) en tant qu'outil de recherche permettant de mieux comprendre les différents mécanismes complexes de l'ubiquitinaion cellulaire, la liaison de certaines protéines activatrices, le dépôt de fibronectine et d'autres aspects du processus de division cellulaire.

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