HPV viral protein E6 binds to ☆p53, a tumor suppressor protein that normally inhibits the proliferation of cells with genetic abnormalities. Ubiquitination of the E6-p53 complex induces degradation of p53, leading to unregulated cellular growth.
HPV viral protein E7 binds to retinoblastoma(Rb) protein, which results in the displacement of E2F (a transcription factor that induces cell cycle activation), promoting unregulated DNA replication and cyclin-mediated cell cycling.
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