Human Papillomavirus 16 oncoprotein E7 retards mitotic progression by blocking Mps1-MAP4 signaling cascade

Oncogene. 2019 Aug;38(31):5959-5970. doi: 10.1038/s41388-019-0851-1. Epub 2019 Jun 28.

Abstract

Human epithelial cells can be infected by more than 200 types of human papilloma viruses (HPVs), and persistent HPV infections lead to cervical cancer or other deadly cancers. It has been established that mitotic progression is critical for HPV16 infection, but the underlying mechanism remains unknown. Here, we report that oncoprotein E7 of HPV16 but not HPV18 retards mitotic progression in host cell by direct binding to the C terminus of Microtubule-Associated Protein 4 (MAP4). MAP4 is a novel bona fide target of HPV16E7 protein which binds and recruits the latter to spindle microtubule in mitosis. HPV16E7 protein promotes MAP4 stability by inhibiting MAP4 phosphorylation- mediated degradation to increase the stability of microtubule polymerization and cause an extend mitotic progression. We further uncovered that Mps1 is a kinase of MAP4, and E7-MAP4 binding blocks Mps1 phosphorylation of MAP4, thereby interrupting phosphorylation-dependent MAP4 degradation. Mutations of MAP4 at T927ES928E partially abolished E7-binding capacity and rescued mitotic progression in host cells. In conclusion, our study reveals a molecular mechanism by which HPV16E7 perturbs host mitotic progression by interfering Mps1-MAP4 signaling cascade, which results in an extended infection window and may facilitate the persistent HPV16 infection.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alphapapillomavirus / isolation & purification
  • Cell Cycle Proteins / metabolism*
  • HeLa Cells
  • Humans
  • Microtubule-Associated Proteins / metabolism*
  • Mitosis*
  • Papillomavirus E7 Proteins
  • Papillomavirus Infections / pathology
  • Papillomavirus Infections / virology
  • Phosphorylation
  • Protein Binding
  • Protein Serine-Threonine Kinases / metabolism*
  • Protein-Tyrosine Kinases / metabolism*
  • Signal Transduction*
  • Virus Attachment

Substances

  • Cell Cycle Proteins
  • MAP4 protein, human
  • Microtubule-Associated Proteins
  • Papillomavirus E7 Proteins
  • oncogene protein E7, Human papillomavirus type 16
  • Protein-Tyrosine Kinases
  • Protein Serine-Threonine Kinases
  • TTK protein, human