Cited by 1,111Immune Response and InflammationNF-κB Signaling PathwaysInflammasome and immune disorders

Helical Assembly in the MyD88-IRAK4-IRAK2 Complex in TLR/IL-1R Signalling

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Lin, Su-Chang, Lo, Yu-Chih, Wu, Hao·2010·Nature

Abstract

MyD88, IRAK4 and IRAK2 are critical signalling mediators of the TLR/IL1-R superfamily. Here we report the crystal structure of the MyD88-IRAK4-IRAK2 death domain (DD) complex, which surprisingly reveals a left-handed helical oligomer that consists of 6 MyD88, 4 IRAK4 and 4 IRAK2 DDs. Assembly of this helical signalling tower is hierarchical, in which MyD88 recruits IRAK4 and the MyD88-IRAK4 complex recruits the IRAK4 substrates IRAK2 or the related IRAK1. Formation of these Myddosome complexes brings the kinase domains of IRAKs into proximity for phosphorylation and activation. Composite binding sites are required for recruitment of the individual DDs in the complex, which are confirmed by mutagenesis and previously identified signalling mutations. Specificities in Myddosome formation are dictated by both molecular complementarity and correspondence of surface electrostatics. The MyD88-IRAK4-IRAK2 complex provides a template for Toll signalling in Drosophila and an elegant mechanism for versatile assembly and regulation of DD complexes in signal transduction.

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  • TLR9 activation induces assembly of the myddosome involving MyD88 and multiple members of the serine threonine kinase family IRAK.

    “TLR9 activation induces the assembly of a supramolecular organizing center called the myddosome, involving MyD88 and multiple members of the serine threonine kinase family IRAK [82,83].”

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Authors
Lin, S.-C., Lo, Y.-C., & Wu, H.
Affiliations
Weill Cornell Medicine (US)
Corresponding author
Wu, Hao
Venue
Nature
Published
2010-05-19
Volume
465
Issue
7300
Pages
885-890
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1993211211
Cited by
1,111
References
60
Citations by year
2026: 48 · 2025: 64 · 2024: 61 · 2023: 61 · 2022: 69 · 2021: 73 · 2020: 91 · 2019: 82 · 2018: 75 · 2017: 75 · 2016: 77 · 2015: 55 · 2014: 87 · 2013: 67 · 2012: 58
FWCI
26.26
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • National Institute of Allergy and Infectious Diseases (R01AI050872)
  • National Institute of Biomedical Imaging and Bioengineering (P30EB009998)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
Keywords
MyD88, IRAK4, IRAK2, death domain, Toll-like receptors, Myddosome, ternary protein complex, innate immunity, kinase activation, surface electrostatics
MeSH terms
Humans, Models, Molecular, Signal Transduction, Protein Structure, Tertiary, Receptors, Interleukin-1, Toll-Like Receptors, Interleukin-1 Receptor-Associated Kinases, Myeloid Differentiation Factor 88

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