Human papillomavirus L1 capsid protein (HPV L1)

Human papillomavirus antigens primarily refer to the L1 major capsid protein, which forms the icosahedral viral capsid of 50-60 nm diameter composed of 360 L1 molecules arranged into 72 pentameric capsomeres.[3][6] The L1 protein features hypervariable surface loops that confer type specificity, enabling immune evasion and limiting antibody cross-reactivity between HPV types like HPV16, HPV18, HPV11, HPV35, HPV58, and HPV59.[1][2][3] These loops contain epitopes targeted by neutralizing monoclonal antibodies, with crystal structures revealing distinct binding modes such as central 1:1 Fab-pentamer interactions or peripheral 5:1 arrangements.[1][2] In disease, L1 facilitates HPV infection leading to warts, precancerous lesions, and cancers (e.g., cervical cancer from high-risk types), while prophylactic vaccines like Gardasil exploit L1 VLPs to elicit protective antibodies preventing viral entry.[1][2][3][4] Therapeutic targeting focuses on L1 for vaccine-induced immunity rather than direct inhibition, with challenges from type diversity necessitating 9-valent formulations.[3][4]

Other names

HPV L1 major capsid proteinL1 proteinHPV capsid protein L1VLP L1

Induction of neutralizing antibodies against L1 pentamers and virus-like particles (VLPs), Prevention of HPV attachment and entry via type-specific epitope blockade