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J Gen Virol 84 (2003), 2099-2104; DOI 10.1099/vir.0.18961-0

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© 2003 Society for General Microbiology

Short Communication

Preferential nuclear localization of the human papillomavirus type 16 E6 oncoprotein in cervical carcinoma cells

Murielle Masson1, Colette Hindelang2, Annie-Paule Sibler1, Georges Schwalbach1, Gilles Travé1 and Etienne Weiss1

1 UMR 7100, Ecole Supérieure de Biotechnologie de Strasbourg, Boulevard Sébastien Brant, BP 10413, 67412 Illkirch cedex, France
2 Institut de Génétique et de Biologie Moléculaire et Cellulaire, Service de Microscopie Electronique, 1 rue Laurent Fries, 67400 Illkirch cedex, France

Correspondence
Murielle Masson
masson{at}esbs.u-strasbg.fr

The E6 protein of the high-risk human papillomavirus type 16 (HPV-16) is involved in the tumorigenesis of human cervical cells by targeting numerous cellular proteins. We characterized new anti-E6 monoclonal antibodies and used them for precise localization of the E6 oncoprotein within carcinoma cells. Overexpressed E6 protein was predominantly detected in the nucleus of transiently transfected HaCaT cells. While mostly localized at the periphery of condensed chromatin, E6 was also associated with nuclear ribonucleoproteic ultrastructures and with some ribosomal areas in the cytoplasm of SiHa and CaSki cells. The chimeric {beta}-galactosidase–E6 protein expressed in transfected HeLa cells was essentially localized in the nuclear compartment. Together, these data indicate that the E6 sequence of HPV-16 may encode a nuclear localization signal. The preferential nuclear distribution of this viral oncoprotein in HPV-transformed cells correlates with its activities at the transcriptional level.




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