Crystal Structure of the TLR4-MD-2 Complex with Bound Endotoxin Antagonist Eritoran

Kim, H.M.,&nbspPark, B.S.,&nbspKim, J.-I.,&nbspKim, S.E.,&nbspLee, J.,&nbspOh, S.C.,&nbspEnkhbayar, P.,&nbspMatsushima, N.,&nbspLee, H.,&nbspYoo, O.J.,&nbspLee, J.-O.

(2007) Cell&nbsp130: 906-917

• PubMed:&nbsp17803912&nbspSearch on PubMed
• DOI:&nbsphttps://doi.org/10.1016/j.cell.2007.08.002
• Primary Citation Related Structures:&nbsp
  2Z62, 2Z63, 2Z64, 2Z65, 2Z66


• PubMed Abstract:&nbsp
  

  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.

  &nbspView More

---

Organizational Affiliation:&nbsp
• Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejon, Korea 305-701.