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HPV E6 proteins interact with specific PML isoforms and allow distinctions to be made between different POD structures.

Ernesto Guccione·Katherine J Lethbridge·Neil Killick·Keith N Leppard·Lawrence Banks
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Abstract

Mucosal human papillomaviruses (HPVs) are the causative agents of a number of human pathologies, including benign condylomas, as well as of the majority of cervical cancers and their high-grade precursor lesions. Although the viral E6 protein is known to be essential for driving malignant progression of HPV-infected cells, there are still many uncertainties about its mode of action. In this study, we have analysed the intracellular distribution of the E6 oncoproteins from the high-risk HPV-18 and the low-risk HPV-11. We show that both E6 proteins localize within the nucleus in nuclear bodies that are confocal with the promyelocytic leukaemia (PML) protein. Using a panel of different PML isoforms, we demonstrate specific co-localization between the E6 proteins and PML isoforms I-IV, but not with PML isoforms V and VI. We also demonstrate the interaction between E6 and a subset of PML isoforms in vivo. As a consequence of this interaction, the insoluble form of PML IV is destabilized by HPV-18 E6 through a proteasome-dependent pathway. Interestingly, both HPV-11 E6 and HPV-18 E6 can readily overcome PML IV-induced cellular senescence in primary cells. These results show separable functions for different PML isoforms that are specifically targeted by the HPV E6 oncoproteins.

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Alternative SplicingAnimalsAntibodies, MonoclonalBlotting, WesternCell Line, TumorCell NucleusCell Transformation, NeoplasticCysteine EndopeptidasesFibroblastsFluorescent Antibody Technique, DirectHumansMicroscopy, ConfocalMultienzyme ComplexesOncogene Proteins, ViralPapillomaviridaePrecipitin TestsProteasome Endopeptidase ComplexProtein IsoformsRNA, MessengerRatsComparative StudyJournal ArticleResearch Support, Non-U.S. Gov't

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Ernesto Guccione, Katherine J Lethbridge, Neil Killick, Keith N Leppard, Lawrence Banks. 2004-06-10. HPV E6 proteins interact with specific PML isoforms and allow distinctions to be made between different POD structures.. https://doi.org/10.1038/sj.onc.1207631

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