Identification of the p21waf1-pcna interaction site and...

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/81 (2006.01) A61K 38/08 (2006.01) A61K 38/10 (2006.01) A61K 38/17 (2006.01) C07K 7/06 (2006.01) C07K 14/47 (2006.01) C12N 15/10 (2006.01) C12Q 1/68 (2006.01) G01N 33/554 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2203909

Substances are disclosed which have the property of binding to PCNA, the substances comprising (i) a fragment of the p21WAF1 protein including residues 141 to 160 of the p21WAF1 amino acid sequence, or an active portion or derivative thereof; or (ii) functional mimetics of these protein fragments. In particular, the PCNA binding activity is shown to lie within the sequence motif <u>O</u>TSMT<u>D</u>F<u>Y</u>, with the residues shown in bold being critical for PCNA binding, with those underlined being important. These substances are useful in the treatments of disorders in which PCNA is implicated, e.g. hyperproliferative disorders such as cancer and psoriasis, the substances binding to PCNA to inactivate it or functionally deplete its level. Also disclosed is the use of a yeast two hybrid screening technique for screening candidate peptides for binding to PCNA.

L'invention se rapporte à des substances qui possèdent la propriété de se fixer au PCNA (antigène nucléaire à cellules prolifératives), ces substances comprenant (i) un fragment de la protéine p21?WAF1¿ contenant les restes 141 à 160 de la séquence d'acides aminés de p21?WAF1¿, ou une partie active ou un dérivé de celle-ci; ou (ii) des mimétiques fonctionnels de ces fragments protéiniques. L'activité de fixation au PCNA intervient notamment dans le motif de la séquence <u>O</u>TSMT<u>D</u>F<u>Y</u>, les restes représentés en gras étant critiques pour la fixation au PCNA, ceux soulignés étant importants. Ces substances sont utilisées dans les traitements de troubles dans lesquels est impliqué le PCNA, tels que des troubles hyperprolifératifs comme le cancer ou le psoriasis, ces substances se fixant au PCNA pour l'inactiver ou réduire fonctionnellement son niveau. L'invention se rapporte également à l'utilisation d'une technique de criblage à deux hybrides de peptides candidats dans la levure en vue de leur fixation au PCNA.

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