5T7Q

TIRAP phosphoinositide-binding motif


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 500 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy and backbone RMSD < 2A 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Membrane targeting of TIRAP is negatively regulated by phosphorylation in its phosphoinositide-binding motif.

Zhao, X.Xiong, W.Xiao, S.Tang, T.X.Ellena, J.F.Armstrong, G.S.Finkielstein, C.V.Capelluto, D.G.

(2017) Sci Rep 7: 43043-43043

  • DOI: 10.1038/srep43043

  • PubMed Abstract: 
  • Pathogen-activated Toll-like receptors (TLRs), such as TLR2 and TLR4, dimerize and move laterally across the plasma membrane to phosphatidylinositol (4,5)-bisphosphate-enriched domains. At these sites, TLRs interact with the TIR domain-containing ada ...

    Pathogen-activated Toll-like receptors (TLRs), such as TLR2 and TLR4, dimerize and move laterally across the plasma membrane to phosphatidylinositol (4,5)-bisphosphate-enriched domains. At these sites, TLRs interact with the TIR domain-containing adaptor protein (TIRAP), triggering a signaling cascade that leads to innate immune responses. Membrane recruitment of TIRAP is mediated by its phosphoinositide (PI)-binding motif (PBM). We show that TIRAP PBM transitions from a disordered to a helical conformation in the presence of either zwitterionic micelles or monodispersed PIs. TIRAP PBM bound PIs through basic and nonpolar residues with high affinity, favoring a more ordered structure. TIRAP is phosphorylated at Thr28 within its PBM, which leads to its ubiquitination and degradation. We demonstrate that phosphorylation distorts the helical structure of TIRAP PBM, reducing PI interactions and cell membrane targeting. Our study provides the basis for TIRAP membrane insertion and the mechanism by which it is removed from membranes to avoid sustained innate immune responses.


    Organizational Affiliation

    Departments of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder CO, 80309, USA.,School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, P. R. China.,Integrated Cellular Responses Laboratory, Department of Biological Sciences, Biocomplexity Institute, Virginia Tech, Blacksburg VA, 24061, USA.,Protein Signaling Domains Laboratory, Department of Biological Sciences, Biocomplexity Institute, and Center for Soft Matter and Biological Physics, Virginia Tech, Blacksburg VA, 24061, USA.,Biomolecular Magnetic Resonance Facility, University of Virginia, Charlottesville VA, 22904, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Toll/interleukin-1 receptor domain-containing adapter protein
A
21Homo 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: SOLUTION NMR
  • Conformers Calculated: 500 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy and backbone RMSD < 2A 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesR03 AI108978-01A1

Revision History 

  • Version 1.0: 2017-03-08
    Type: Initial release
  • Version 1.1: 2017-09-27
    Type: Author supporting evidence
  • Version 1.2: 2018-08-29
    Type: Data collection, Database references