Cell. 1990 Dec 21;63(6):1129-36.

The E6 oncoprotein encoded by human papillomavirus types 16 and 18 promotes the degradation of p53.

Scheffner M, Werness BA, Huibregtse JM, Levine AJ, Howley PM.

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Laboratory of Tumor Virus Biology, National Cancer Institute, Bethesda, Maryland 20892.

Abstract

The E6 protein encoded by the oncogenic human papillomavirus types 16 and 18 is one of two viral products expressed in HPV-associated cancers. E6 is an oncoprotein which cooperates with E7 to immortalize primary human keratinocytes. Insight into the mechanism by which E6 functions in oncogenesis is provided by the observation that the E6 protein encoded by HPV-16 and HPV-18 can complex the wild-type p53 protein in vitro. Wild-type p53 gene has tumor suppressor properties, and is a target for several of the oncoproteins encoded by DNA tumor viruses. In this study we demonstrate that the E6 proteins of the oncogenic HPVs that bind p53 stimulate the degradation of p53. The E6-promoted degradation of p53 is ATP dependent and involves the ubiquitin-dependent protease system. Selective degradation of cellular proteins such as p53 with negative regulatory functions provides a novel mechanism of action for dominant-acting oncoproteins.

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