TIR domain of Mal/TIRAP

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.248 
  • R-Value Observed: 0.248 

wwPDB Validation   3D Report Full Report

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Structural Insights into TIR Domain Specificity of the Bridging Adaptor Mal in TLR4 Signaling

Lin, Z.Lu, J.Zhou, W.Shen, Y.

(2012) PLoS One 7: e34202-e34202

  • DOI: https://doi.org/10.1371/journal.pone.0034202
  • Primary Citation of Related Structures:  
    3UB2, 3UB3, 3UB4

  • PubMed Abstract: 

    MyD88 adaptor-like protein (Mal) is a crucial adaptor that acts as a bridge to recruit the MyD88 molecule to activated TLR4 receptors in response to invading pathogens. The specific assembly of the Toll/interleukin-1 receptor (TIR) domains of TLR4, Mal and MyD88 is responsible for proper signal transduction in the TLR4 signaling pathway. However, the molecular mechanism for the specificity of these TIR domains remains unclear. Here, we present the crystal structure of the TIR domain of the human Mal molecule (Mal-TIR) at a resolution of 2.4 Å. Unexpectedly, Mal-TIR exhibits an extraordinarily long AB loop, but no αB helix or BB loop, distinguishing it from other TIR domains. More importantly, the Mal-TIR AB loop is capable of mediating direct binding to the TIR domains of TLR4 and MyD88 simultaneously. We also found that Mal-TIR can form a back-to-back dimer that may resemble the dimeric assembly of the entire Mal molecule. Our data demonstrate the bridge role of the Mal-TIR domain and provide important information about TIR domain specificity.

  • Organizational Affiliation

    State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Toll/interleukin-1 receptor domain-containing adapter protein146Homo sapiensMutation(s): 0 
Gene Names: TIRAPMAL
UniProt & NIH Common Fund Data Resources
Find proteins for P58753 (Homo sapiens)
Explore P58753 
Go to UniProtKB:  P58753
PHAROS:  P58753
GTEx:  ENSG00000150455 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP58753
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on DTT

Download Ideal Coordinates CCD File 
C4 H10 O2 S2
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.248 
  • R-Value Observed: 0.248 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.508α = 90
b = 87.508β = 90
c = 81.684γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHENIXmodel building
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-05-16
    Type: Initial release