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 1.3 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
  • Primary Citation of Related Structures:  
    5T7Q

  • 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 adaptor protein (TIRAP), triggering a signaling cascade that leads to innate immune responses ...

    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: 

    Protein Signaling Domains Laboratory, Department of Biological Sciences, Biocomplexity Institute, and Center for Soft Matter and Biological Physics, Virginia Tech, Blacksburg VA, 24061, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Toll/interleukin-1 receptor domain-containing adapter proteinA21Homo sapiensMutation(s): 0 
Gene Names: TIRAP, MAL
Membrane Entity: Yes 
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
Protein Feature View
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  • Reference Sequence
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 
  • OLDERADO: 5T7Q Olderado

Structure Validation

View Full Validation Report



View more in-depth experimental data

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR03 AI108978-01A1

Revision History  (Full details and data files)

  • Version 1.0: 2017-03-08
    Type: Initial release
  • Version 1.1: 2017-09-27
    Changes: Author supporting evidence
  • Version 1.2: 2018-08-29
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-11
    Changes: Author supporting evidence, Data collection