Human papillomavirus E1 protein (HPV E1)

The Human papillomavirus E1 protein is the most highly conserved and essential viral protein for papillomavirus replication. It functions as an ATP-dependent helicase, binding to the viral origin of replication, unwinding double-stranded viral DNA, and facilitating the assembly of the replication machinery—including host cell factors. The E1 protein contains an N-terminal regulatory domain, a DNA-binding domain, and a helicase domain that forms a complex structure around DNA[1][6]. It interacts with another viral protein, E2, to assemble at the origin and initiate replication. Beyond its role in DNA synthesis, E1 can modulate host cell cycle, induce DNA damage responses, and impact host antiviral genes, contributing to immune evasion and viral persistence. E1 is implicated in cervical carcinogenesis through its effects on viral genome maintenance and indirect regulation of cellular proliferation. While not yet the direct target of clinical drugs, E1 remains an attractive target for antiviral therapy due to its unique and indispensable role in the HPV life cycle[1][3][5][7].

Other names

E1 proteinHPV E1Papillomavirus E1PV E1

Drug mechanisms (experimental) would include ATPase/helicase inhibition, disruption of E1-E2 interaction, or blocking DNA origin binding[6][7]. Most research focuses on targeting its enzymatic (helicase, ATPase) activity.