About Human Enterovirus A71 (EV71) VP4 Protein

Human Enterovirus A71 (EV71) is a major causative agent of hand, foot and mouth disease (HFMD) and is associated with severe neurological complications including meningitis, encephalitis, and acute flaccid paralysis. The VP4 protein is one of the four structural proteins that comprise the EV71 capsid and is generated during virion maturation through cleavage of the precursor protein VP0. Unlike VP1, VP2, and VP3, which are exposed on the viral surface, VP4 is located on the inner surface of the capsid where it contributes to capsid stability, virion maturation, and the early stages of infection.

VP4 plays a critical role during viral entry. Following receptor engagement, the EV71 capsid undergoes conformational changes that result in the externalization of VP4 and the N-terminus of VP1. Together, these proteins help create a membrane pore that enables transfer of the viral RNA genome into the host cell cytoplasm. Because of its essential role in uncoating and genome delivery, VP4 has emerged as an attractive target for mechanistic studies of viral entry and antiviral intervention strategies.

eEnzyme's recombinant Human Enterovirus A71 VP4 Protein provides a valuable research tool for investigations of viral assembly, capsid maturation, membrane penetration, host-pathogen interactions, and antiviral drug discovery. The protein is suitable for antibody generation, protein interaction studies, structural biology investigations, epitope characterization, and immunological assay development. Researchers can utilize this recombinant antigen to investigate EV71 infection mechanisms and support the development of novel therapeutic strategies against enterovirus infection.

Applications of EV71 VP4 Protein

• Viral entry and uncoating studies
• Capsid maturation and assembly investigations
• Antiviral drug discovery and target validation
• Antibody generation and characterization
• Protein interaction and structural biology studies
• ELISA, Western blot, and immunological assays

Biological Significance of VP4

VP4 is a highly conserved internal capsid protein that contributes to the structural integrity and infectivity of EV71 particles. During viral entry, VP4 is released from the inner capsid surface and participates in the formation of membrane pores required for genome translocation into host cells. Studies have demonstrated that VP4 is critical for efficient infection and replication, making it an important target for understanding enterovirus biology and for the development of antiviral therapeutics. Because VP4 is more conserved than many surface-exposed capsid proteins, it has also attracted interest as a potential target for broadly reactive enterovirus research approaches.