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Science 18 April 2008:
Vol. 320. no. 5874, pp. 379 - 381
DOI: 10.1126/science.1155406
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Reports

Structural Basis of Toll-Like Receptor 3 Signaling with Double-Stranded RNA

Lin Liu,1 Istvan Botos,1 Yan Wang,2 Joshua N. Leonard,2 Joseph Shiloach,3 David M. Segal,2 David R. Davies1*

Toll-like receptor 3 (TLR3) recognizes double-stranded RNA (dsRNA), a molecular signature of most viruses, and triggers inflammatory responses that prevent viral spread. TLR3 ectodomains (ECDs) dimerize on oligonucleotides of at least 40 to 50 base pairs in length, the minimal length required for signal transduction. To establish the molecular basis for ligand binding and signaling, we determined the crystal structure of a complex between two mouse TLR3-ECDs and dsRNA at 3.4 angstrom resolution. Each TLR3-ECD binds dsRNA at two sites located at opposite ends of the TLR3 horseshoe, and an intermolecular contact between the two TLR3-ECD C-terminal domains coordinates and stabilizes the dimer. This juxtaposition could mediate downstream signaling by dimerizing the cytoplasmic Toll interleukin-1 receptor (TIR) domains. The overall shape of the TLR3-ECD does not change upon binding to dsRNA.

1 Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
2 Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD20892, USA.
3 Biotechnology Unit, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.

* To whom correspondence should be addressed: david.davies{at}nih.gov

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