5UZB

Cryo-EM structure of the MAL TIR domain filament


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis of TIR-domain-assembly formation in MAL- and MyD88-dependent TLR4 signaling.

Ve, T.Vajjhala, P.R.Hedger, A.Croll, T.DiMaio, F.Horsefield, S.Yu, X.Lavrencic, P.Hassan, Z.Morgan, G.P.Mansell, A.Mobli, M.O'Carroll, A.Chauvin, B.Gambin, Y.Sierecki, E.Landsberg, M.J.Stacey, K.J.Egelman, E.H.Kobe, B.

(2017) Nat. Struct. Mol. Biol. 24: 743-751

  • DOI: 10.1038/nsmb.3444

  • PubMed Abstract: 
  • Toll-like receptor (TLR) signaling is a key innate immunity response to pathogens. Recruitment of signaling adapters such as MAL (TIRAP) and MyD88 to the TLRs requires Toll/interleukin-1 receptor (TIR)-domain interactions, which remain structurally e ...

    Toll-like receptor (TLR) signaling is a key innate immunity response to pathogens. Recruitment of signaling adapters such as MAL (TIRAP) and MyD88 to the TLRs requires Toll/interleukin-1 receptor (TIR)-domain interactions, which remain structurally elusive. Here we show that MAL TIR domains spontaneously and reversibly form filaments in vitro. They also form cofilaments with TLR4 TIR domains and induce formation of MyD88 assemblies. A 7-Å-resolution cryo-EM structure reveals a stable MAL protofilament consisting of two parallel strands of TIR-domain subunits in a BB-loop-mediated head-to-tail arrangement. Interface residues that are important for the interaction are conserved among different TIR domains. Although large filaments of TLR4, MAL or MyD88 are unlikely to form during cellular signaling, structure-guided mutagenesis, combined with in vivo interaction assays, demonstrated that the MAL interactions defined within the filament represent a template for a conserved mode of TIR-domain interaction involved in both TLR and interleukin-1 receptor signaling.


    Organizational Affiliation

    School of Chemistry and Molecular Biosciences, and Australian Infectious Diseases Research Centre, University of Queensland, Brisbane, Queensland, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Toll/interleukin-1 receptor domain-containing adapter protein
A, B, C, D, E, F, G, H, I, J, K, L, M, N
177Homo sapiensMutation(s): 0 
Gene Names: TIRAP (MAL)
Find proteins for P58753 (Homo sapiens)
Go to Gene View: TIRAP
Go to UniProtKB:  P58753
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Health and Medical Research Council (Australia)Australia1107804

Revision History 

  • Version 1.0: 2017-07-26
    Type: Initial release
  • Version 1.1: 2017-08-23
    Type: Database references
  • Version 1.2: 2017-09-20
    Type: Data collection, Database references
  • Version 1.3: 2018-07-18
    Type: Data collection