Download MendeleyNonself RNA-Sensing Mechanism of RIG-I Helicase and Activation of Antiviral Immune Responses
Takahasi, K., Yoneyama, M., Nishihori, T., Hirai, R., Kumeta, H., Narita, R., Gale Jr., M., Inagaki, F., Fujita, T.(2008) Mol Cell 29: 428-440
- PubMed: 18242112
- DOI: https://doi.org/10.1016/j.molcel.2007.11.028
- Primary Citation of Related Structures:
2RMJ - PubMed Abstract:
A DExD/H protein, RIG-I, is critical in innate antiviral responses by sensing viral RNA. Here we show that RIG-I recognizes two distinct viral RNA patterns: double-stranded (ds) and 5'ppp single-stranded (ss) RNA. The binding of RIG-I with dsRNA or 5'ppp ssRNA in the presence of ATP produces a common structure, as suggested by protease digestion. Further analyses demonstrated that the C-terminal domain of RIG-I (CTD) recognizes these RNA patterns and CTD coincides with the autorepression domain. Structural analysis of CTD by NMR spectroscopy in conjunction with mutagenesis revealed that the basic surface of CTD with a characteristic cleft interacts with RIG-I ligands. Our results suggest that the bipartite structure of CTD regulates RIG-I on encountering viral RNA patterns.
Organizational Affiliation:
Department of Structural Biology, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo, Hokkaido 060-0812, Japan.
