Vaccinia virus-encoded immune evasion proteins

Vaccinia virus-encoded immune evasion proteins (IEPs) are a diverse array of viral factors specialized in subverting the host's innate and adaptive immune responses. These proteins, which include well-characterized members such as E3 (E3L), K3 (K3L), B15 (B15R), and B18 (B18R), employ multiple strategies to neutralize host defenses, including the sequestration of double-stranded RNA, acting as decoy receptors for cytokines and interferons, and directly inhibiting key signaling pathways like NF-kappaB and JAK-STAT. By preventing the establishment of an antiviral state and blocking apoptosis or necroptosis of infected cells, these proteins facilitate efficient viral replication and dissemination. In the context of disease, they are primary virulence factors for orthopoxviruses, including those responsible for smallpox and monkeypox. While there are currently no FDA-approved drugs that specifically target these evasion proteins, they are central to the development of next-generation antivirals and the engineering of safer, highly immunogenic vaccine vectors such as Modified Vaccinia Ankara (MVA).

Other names

Vaccinia virus immunomodulatory proteinsVACV immune evasion factorsPoxvirus immune evasion proteinsOrthopoxvirus immunomodulators