4DOM

Crystal Structure of the TIR-domain of Human Myeloid Differentiation Primary Response protein (MyD88)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.798 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.180 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Molecular mechanisms for the subversion of MyD88 signaling by TcpC from virulent uropathogenic Escherichia coli.

Snyder, G.A.Cirl, C.Jiang, J.Chen, K.Waldhuber, A.Smith, P.Rommler, F.Snyder, N.Fresquez, T.Durr, S.Tjandra, N.Miethke, T.Xiao, T.S.

(2013) Proc.Natl.Acad.Sci.USA 110: 6985-6990

  • DOI: 10.1073/pnas.1215770110
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The Toll/IL-1 receptor (TIR) domains are crucial signaling modules during innate immune responses involving the Toll-like receptors (TLRs) and IL-1 receptor (IL-1R). Myeloid differential factor 88 (MyD88) is a central TIR domain-containing adapter mo ...

    The Toll/IL-1 receptor (TIR) domains are crucial signaling modules during innate immune responses involving the Toll-like receptors (TLRs) and IL-1 receptor (IL-1R). Myeloid differential factor 88 (MyD88) is a central TIR domain-containing adapter molecule responsible for nearly all TLR-mediated signaling and is targeted by a TIR domain-containing protein C (TcpC) from virulent uropathogenic Escherichia coli, a common human pathogen. The mechanism of such molecular antagonism has remained elusive. We present the crystal structure of the MyD88 TIR domain with distinct loop conformations that underscore the functional specialization of the adapter, receptor, and microbial TIR domains. Our structural analyses shed light on the genetic mutations at these loops as well as the Poc site. We demonstrate that TcpC directly associates with MyD88 and TLR4 through its predicted DD and BB loops to impair the TLR-induced cytokine induction. Furthermore, NMR titration experiments identify the unique CD, DE, and EE loops from MyD88 at the TcpC-interacting surface, suggesting that TcpC specifically engages these MyD88 structural elements for immune suppression. These findings thus provide a molecular basis for the subversion of TLR signaling by the uropathogenic E. coli virulence factor TcpC and furnish a framework for the design of novel therapeutic agents that modulate immune activation.


    Organizational Affiliation

    Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Myeloid differentiation primary response protein MyD88
A
141Homo sapiensMutation(s): 0 
Gene Names: MYD88
Find proteins for Q99836 (Homo sapiens)
Go to Gene View: MYD88
Go to UniProtKB:  Q99836
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
CSO
Query on CSO
A
L-PEPTIDE LINKINGC3 H7 N O3 SCYS
MLY
Query on MLY
A
L-PEPTIDE LINKINGC8 H18 N2 O2LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.798 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.180 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 33.415α = 90.00
b = 57.991β = 90.00
c = 62.495γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
ADSCdata collection
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-04-10
    Type: Initial release
  • Version 1.1: 2013-04-24
    Type: Database references
  • Version 1.2: 2013-05-08
    Type: Database references