Download MendeleySolution Structure Analysis of the HPV16 E6 Oncoprotein Reveals a Self-Association Mechanism Required for E6-Mediated Degradation of p53.
Zanier, K., Ould M'hamed Ould Sidi, A., Boulade-Ladame, C., Rybin, V., Chappelle, A., Atkinson, A., Kieffer, B., Trave, G.(2012) Structure 20: 604-617
- PubMed: 22483108
- DOI: https://doi.org/10.1016/j.str.2012.02.001
- Primary Citation of Related Structures:
2LJX, 2LJY, 2LJZ - PubMed Abstract:
The viral oncoprotein E6 is an essential factor for cervical cancers induced by "high-risk" mucosal HPV. Among other oncogenic activities, E6 recruits the ubiquitin ligase E6AP to promote the ubiquitination and subsequent proteasomal degradation of p53. E6 is prone to self-association, which long precluded its structural analysis. Here we found that E6 specifically dimerizes through its N-terminal domain and that disruption of the dimer interface strongly increases E6 solubility. This allowed us to raise structural data covering the entire HPV16 E6 protein, including the high-resolution NMR structures of the two zinc-binding domains of E6 and a robust data-driven model structure of the N-terminal domain homodimer. Interestingly, homodimer interface mutations that disrupt E6 self-association also inactivate E6-mediated p53 degradation. These data suggest that E6 needs to self-associate via its N-terminal domain to promote the polyubiquitination of p53 by E6AP.
Organizational Affiliation:
Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg (IREBS), Boulevard Sébastien Brant, BP 10413, 67412 Illkirch, France. zanier@unistra.fr
