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Title: MyD88 TIR domain higher-order assembly interactions revealed by microcrystal electron diffraction and serial femtosecond crystallography

Journal Article · · Nature Communications
ORCiD logo [1];  [2]; ORCiD logo [3];  [3];  [3]; ORCiD logo [4];  [5];  [6];  [2]; ORCiD logo [3];  [3]; ORCiD logo [7]; ORCiD logo [7];  [7];  [7]; ORCiD logo [8]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [9];  [9] more »;  [3]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [8]; ORCiD logo [4] « less
  1. Univ. of California, Los Angeles, CA (United States); Stockholm Univ. (Sweden)
  2. La Trobe Univ., Melbourne, VIC (Australia)
  3. Univ. of Queensland, Brisbane, QLD (Australia)
  4. Griffith Univ., Queensland (Australia)
  5. Univ. of Queensland, Brisbane, QLD (Australia); Univ. of New South Wales, Kensington, NSW (Australia)
  6. Univ. of Cambridge (United Kingdom)
  7. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  8. Stockholm Univ. (Sweden)
  9. Univ. of New South Wales, Kensington, NSW (Australia)

MyD88 and MAL are Toll-like receptor (TLR) adaptors that signal to induce pro-inflammatory cytokine production. We previously observed that the TIR domain of MAL (MALTIR) forms filaments in vitro and induces formation of crystalline higher-order assemblies of the MyD88 TIR domain (MyD88TIR). These crystals are too small for conventional X-ray crystallography, but are ideally suited to structure determination by microcrystal electron diffraction (MicroED) and serial femtosecond crystallography (SFX). Here, we present MicroED and SFX structures of the MyD88TIR assembly, which reveal a two-stranded higher-order assembly arrangement of TIR domains analogous to that seen previously for MALTIR. We demonstrate via mutagenesis that the MyD88TIR assembly interfaces are critical for TLR4 signaling in vivo, and we show that MAL promotes unidirectional assembly of MyD88TIR. Collectively, our studies provide structural and mechanistic insight into TLR signal transduction and allow a direct comparison of the MicroED and SFX techniques.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1819837
Journal Information:
Nature Communications, Vol. 12, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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