Epstein-Barr virus large tegument protein BPLF1 contributes to innate immune evasion through interference with toll-like receptor signaling

• Published in: PLoS pathogens Vol. 10; no. 2; p. e1003960
• Main Authors: van Gent, Michiel, Braem, Steven G E, de Jong, Annemieke, Delagic, Nezira, Peeters, Janneke G C, Boer, Ingrid G J, Moynagh, Paul N, Kremmer, Elisabeth, Wiertz, Emmanuel J, Ovaa, Huib, Griffin, Bryan D, Ressing, Maaike E
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 01.02.2014; Public Library of Science (PLoS)
• Subjects: Biology; Enzyme-Linked Immunosorbent Assay; Epstein-Barr virus; Epstein-Barr Virus Infections - immunology; Epstein-Barr Virus Infections - metabolism; Flow Cytometry; Fluorescent Antibody Technique; Herpesvirus 4, Human; Herpesviruses; Host-bacteria relationships; Humans; Immune Evasion - immunology; Immune response; Immune system; Immunity, Innate; Immunoblotting; Infections; Medical research; Microbiological research; Physiological aspects; Signal Transduction - immunology; Toll-like receptors; Toll-Like Receptors - immunology; Toll-Like Receptors - metabolism; Transfection; Viral infections; Viral Regulatory and Accessory Proteins - immunology; Viral Regulatory and Accessory Proteins - metabolism; Enzyme-Linked Immunosorbent Assay; Signal Transduction; Humans; Immunoblotting; Immunity, Innate; Herpesvirus 4, Human; Toll-Like Receptors; Flow Cytometry; Immune Evasion; Transfection; Fluorescent Antibody Technique; Viral Regulatory & Accessory Proteins; Epstein-Barr Virus Infections
• ISSN: 1553-7374; 1553-7366; 1553-7374
• DOI: 10.1371/journal.ppat.1003960

Viral infection triggers an early host response through activation of pattern recognition receptors, including Toll-like receptors (TLR). TLR signaling cascades induce production of type I interferons and proinflammatory cytokines involved in establishing an anti-viral state as well as in orchestrating ensuing adaptive immunity. To allow infection, replication, and persistence, (herpes)viruses employ ingenious strategies to evade host immunity. The human gamma-herpesvirus Epstein-Barr virus (EBV) is a large, enveloped DNA virus persistently carried by more than 90% of adults worldwide. It is the causative agent of infectious mononucleosis and is associated with several malignant tumors. EBV activates TLRs, including TLR2, TLR3, and TLR9. Interestingly, both the expression of and signaling by TLRs is attenuated during productive EBV infection. Ubiquitination plays an important role in regulating TLR signaling and is controlled by ubiquitin ligases and deubiquitinases (DUBs). The EBV genome encodes three proteins reported to exert in vitro deubiquitinase activity. Using active site-directed probes, we show that one of these putative DUBs, the conserved herpesvirus large tegument protein BPLF1, acts as a functional DUB in EBV-producing B cells. The BPLF1 enzyme is expressed during the late phase of lytic EBV infection and is incorporated into viral particles. The N-terminal part of the large BPLF1 protein contains the catalytic site for DUB activity and suppresses TLR-mediated activation of NF-κB at, or downstream of, the TRAF6 signaling intermediate. A catalytically inactive mutant of this EBV protein did not reduce NF-κB activation, indicating that DUB activity is essential for attenuating TLR signal transduction. Our combined results show that EBV employs deubiquitination of signaling intermediates in the TLR cascade as a mechanism to counteract innate anti-viral immunity of infected hosts.