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Cloning and expression of the cDNA for E6-AP, a protein that mediates the interaction of the human papillomavirus E6 oncoprotein with p53.

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

ABSTRACT

The E6 oncoproteins of the cancer-associated or high-risk human papillomaviruses (HPVs) target the cellular p53 protein. The association of E6 with p53 leads to the specific ubiquitination and degradation of p53 in vitro, suggesting a model by which E6 deregulates cell growth control by the elimination of the p53 tumor suppressor protein. Complex formation between E6 and p53 requires an additional cellular factor, designated E6-AP (E6-associated protein), which has a native and subunit molecular mass of approximately 100 kDa. Here we report the purification of E6-AP and the cloning of its corresponding cDNA, which contains a novel open reading frame encoding 865 amino acids. E6-AP, translated in vitro, has the following properties: (i) it associates with wild-type p53 in the presence of the HPV16 E6 protein and simultaneously stimulates the association of E6 with p53, (ii) it associates with the high-risk HPV16 and HPV18 E6 proteins in the absence of p53, and (iii) it induces the E6- and ubiquitin-dependent degradation of p53 in vitro.

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