3B2D

Crystal structure of human RP105/MD-1 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

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.

(2011) J.Mol.Biol. 413: 815-825

  • DOI: 10.1016/j.jmb.2011.09.020
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The 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. M ...

    The 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 Å 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.


    Organizational Affiliation

    Graduate School of Pharmaceutical Sciences, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CD180 antigen
A, B
603Homo sapiensMutation(s): 0 
Gene Names: CD180 (LY64, RP105)
Find proteins for Q99467 (Homo sapiens)
Go to Gene View: CD180
Go to UniProtKB:  Q99467
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Lymphocyte antigen 86
C, D
144Homo sapiensMutation(s): 0 
Gene Names: LY86 (MD1)
Find proteins for O95711 (Homo sapiens)
Go to Gene View: LY86
Go to UniProtKB:  O95711
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MAN
Query on MAN

Download SDF File 
Download CCD File 
A, B
ALPHA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-PQMKYFCFSA-N
 Ligand Interaction
BMA
Query on BMA

Download SDF File 
Download CCD File 
A, B
BETA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-RWOPYEJCSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.218 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 203.997α = 90.00
b = 66.441β = 90.00
c = 119.097γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
REFMACrefinement
HKL-2000data scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2011-07-29 
  • Released Date: 2011-11-09 
  • Deposition Author(s): Ohto, U., Shimizu, T.

Revision History 

  • Version 1.0: 2011-11-09
    Type: Initial release