title: Association of the human papillomavirus type 16 E7 oncoprotein with the 600-kDa retinoblastoma protein-associated factor, p600.
abstract: The human papillomavirus type 16 (HPV-16) E7 gene encodes a multifunctional oncoprotein that can subvert multiple cellular regulatory pathways. The best-known cellular targets of the HPV-16 E7 oncoprotein are the retinoblastoma tumor suppressor protein pRB and the related pocket proteins p107 and p130. However, there is ample evidence that E7 has additional cellular targets that contribute to its transforming potential. We isolated HPV-16 E7 associated cellular protein complexes by tandem affinity purification and mass spectrometry and identified the 600-kDa retinoblastoma protein associated factor, p600, as a cellular target of E7. Association of E7 with p600 is independent of the pocket proteins and is mediated through the N terminal E7 domain, which is related to conserved region 1 of the adenovirus E1A protein and importantly contributes to cellular transformation independent of pRB binding. Depletion of p600 protein levels by RNA interference substantially decreased anchorage-independent growth in HPV-positive and -negative human cancer cells. Therefore, p600 is a cellular target of E7 that regulates cellular pathways that contribute to anchorage-independent growth and cellular transformation.
authors.affiliation: The Channing Laboratory, Brigham and Women's Hospital and Department of Medicine, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: Kyung-Won
authors.initials: KW
authors.lastname: Huh
authors.forename: Joseph
authors.initials: J
authors.lastname: DeMasi
authors.forename: Hidesato
authors.initials: H
authors.lastname: Ogawa
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Nakatani
authors.forename: Peter M
authors.initials: PM
authors.lastname: Howley
authors.forename: Karl
authors.initials: K
authors.lastname: Münger
mesh_terms: D002148:Calmodulin-Binding Proteins / Q000378:metabolism*; D049109:Cell Proliferation; D002472:Cell Transformation, Viral / Q000235:genetics*; D006367:HeLa Cells; D006801:Humans; D047468:Immunoprecipitation; D013058:Mass Spectrometry; D008856:Microscopy, Fluorescence; D046912:Multiprotein Complexes / Q000302:isolation & purification / Q000378:metabolism*; D009856:Oncogene Proteins, Viral / Q000378:metabolism*; D027383:Papillomaviridae / Q000378:metabolism*; D050725:Papillomavirus E7 Proteins; D011485:Protein Binding; D034622:RNA Interference
chemical_list: D002148:Calmodulin-Binding Proteins; D046912:Multiprotein Complexes; D009856:Oncogene Proteins, Viral; D050725:Papillomavirus E7 Proteins; C059731:oncogene protein E7, Human papillomavirus type 16