3t6q | pdb_00003t6q
Crystal structure of mouse RP105/MD-1 complex
Structural highlights
Function[CD180_MOUSE] May cooperate with MD-1 and TLR4 to mediate the innate immune response to bacterial lipopolysaccharide (LPS) in B-cells. Leads to NF-kappa-B activation. Also involved in the life/death decision of B-cells.[1] [LY86_MOUSE] May cooperate with CD180 and TLR4 to mediate the innate immune response to bacterial lipopolysaccharide (LPS) and cytokine production. Important for efficient CD180 cell surface expression.[2] Publication Abstract from PubMedThe Toll-like receptor (TLR) 4/MD-2 heterodimer senses lipopolysaccharide (LPS). RP105 (radioprotective 105 kDa), a TLR-related molecule, is similar to TLR4 in that the extracellular leucine-rich repeats associate with MD-1, the MD-2-like molecule. MD-2 has a unique hydrophobic cavity that directly binds to lipid A, the active center of LPS. LPS-bound MD-2 opens the secondary interface with TLR4, leading to dimerization of TLR4/MD-2. MD-1 also has a hydrophobic cavity that accommodates lipid IVa, a precursor of lipid A, suggesting a role for the RP105/MD-1 heterodimer in sensing LPS or related microbial products. Little is known, however, about the structure of the RP105/MD-1 heterodimer or its oligomer. Here, we have determined the crystal structures of mouse and human RP105/MD-1 complexes at 1.9 and 2.8 A resolutions, respectively. Both mouse and human RP105/MD-1 exhibit dimerization of the 1:1 RP105/MD-1 complex, demonstrating a novel organization. The "m"-shaped 2:2 RP105/MD-1 complex exhibits an inverse arrangement, with N-termini interacting in the middle. Thus, the dimerization interface of RP105/MD-1 is located on the opposite side of the complex, compared to the 2:2 TLR4/MD-2 complex. These results demonstrate that the 2:2 RP105/MD-1 complex is distinct from previously reported TLR dimers, including TLR4/MD-2, TLR1/TLR2, TLR2/TLR6, and TLR3, all of which facilitate homotypic or heterotypic interaction of the C-terminal cytoplasmic signaling domain. Crystal Structures of Mouse and Human RP105/MD-1 Complexes Reveal Unique Dimer Organization of the Toll-Like Receptor Family.,Ohto U, Miyake K, Shimizu T J Mol Biol. 2011 Nov 4;413(4):815-25. Epub 2011 Sep 19. PMID:21959264[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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