Differential Regulation of Interferon Responses by Ebola and Marburg Virus VP35 Proteins [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 576.8 Evolution
• Thông tin xuất bản: Bethesda, Md. : Oak Ridge, Tenn. : National Institutes of Health (U.S.) ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2016
• Mô tả vật lý: Size: p. 1632-1640 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 260971
• Chủ đề: 1. 59 basic biological sciences; 2. 60 applied life sciences; 3. Filovirus; 4. Immune evasion; 5. Pattern associated molecular pattern (pamp); 6. Rig-i like receptor; 7. Type i interferon; 8. Vp35

Tóm tắt

Suppression of innate immune responses during filoviral infection contributes to disease severity. Ebola (EBOV) and Marburg (MARV) viruses each encode a VP35 protein that suppresses RIG-I-like receptor signaling and interferon-?/? (IFN-?/?) production by several mechanisms, including direct binding to double stranded RNA (dsRNA). Here, we demonstrate that in cell culture, MARV infection results in a greater upregulation of IFN responses as compared to EBOV infection. This correlates with differences in the efficiencies by which EBOV and MARV VP35s antagonize RIG-I signaling. Furthermore, structural and biochemical studies suggest that differential recognition of RNA elements by the respective VP35 C-terminal IFN inhibitory domain (IID) rather than affinity for RNA by the respective VP35s is critical for this observation. Our studies reveal functional differences in EBOV versus MARV VP35 RNA binding that result in unexpected differences in the host response to deadly viral pathogens.