Mechanism of HPV E6 proteins in cellular transformation

Semin Cancer Biol. 1996 Dec;7(6):317-26. doi: 10.1006/scbi.1996.0041.


The E6 protein is a major transforming protein of many types of papillomaviruses. Mechanistically, the best characterized E6 proteins are those of the high-risk genital HPVs (e.g. HPV-16 and 18 E6), which function, at least in part, by inactivating the p53 tumor suppressor protein. Biochemical studies have shown that this occurs by targeted degradation of p53, dependent on the E6-AP ubiquitin-protein ligase. The model that has emerged from E6/E6-AP-dependent p53 degradation has provided insight into both HPV-associated carcinogenesis and the problem of substrate specificity of the ubiquitin system. Several observations suggest that the high-risk HPV E6 proteins may also have activities in addition to inactivation of p53.

Publication types

  • Review

MeSH terms

  • Amino Acid Sequence
  • Cell Transformation, Viral*
  • DNA-Binding Proteins*
  • Female
  • Genes, p53
  • Humans
  • Molecular Sequence Data
  • Oncogene Proteins, Viral / physiology*
  • Papillomaviridae*
  • Repressor Proteins*
  • Structure-Activity Relationship
  • Uterine Cervical Neoplasms / genetics


  • DNA-Binding Proteins
  • E6 protein, Human papillomavirus type 16
  • E6 protein, Human papillomavirus type 18
  • Oncogene Proteins, Viral
  • Repressor Proteins