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Cell. 2007 Sep 7;130(5):906-17.

Crystal structure of the TLR4-MD-2 complex with bound endotoxin antagonist Eritoran.

Author information

1
Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejon, Korea 305-701.

Abstract

TLR4 and MD-2 form a heterodimer that recognizes LPS (lipopolysaccharide) from Gram-negative bacteria. Eritoran is an analog of LPS that antagonizes its activity by binding to the TLR4-MD-2 complex. We determined the structure of the full-length ectodomain of the mouse TLR4 and MD-2 complex. We also produced a series of hybrids of human TLR4 and hagfish VLR and determined their structures with and without bound MD-2 and Eritoran. TLR4 is an atypical member of the LRR family and is composed of N-terminal, central, and C-terminal domains. The beta sheet of the central domain shows unusually small radii and large twist angles. MD-2 binds to the concave surface of the N-terminal and central domains. The interaction with Eritoran is mediated by a hydrophobic internal pocket in MD-2. Based on structural analysis and mutagenesis experiments on MD-2 and TLR4, we propose a model of TLR4-MD-2 dimerization induced by LPS.

PMID:
17803912
DOI:
10.1016/j.cell.2007.08.002
[Indexed for MEDLINE]
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