7BEQ

MicroED structure of the MyD88 TIR domain higher-order assembly

Summary for 7BEQ

• Entry DOI: 10.2210/pdb7beq/pdb
• Descriptor: Myeloid differentiation primary response protein MyD88 (1 entity in total)
• Functional Keywords: microed, myd88, tir domain, higher-order assembly, protein binding
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 1
• Total formula weight: 17833.85

Authors

Clabbers, M.T.B.,Holmes, S.,Muusse, T.W.,Vajjhala, P.,Thygesen, S.J.,Malde, A.K.,Hunter, D.J.B.,Croll, T.I.,Nanson, J.D.,Rahaman, M.H.,Aquila, A.,Hunter, M.S.,Liang, M.,Yoon, C.H.,Zhao, J.,Zatsepin, N.A.,Abbey, B.,Sierecki, E.,Gambin, Y.,Darmanin, C.,Kobe, B.,Xu, H.,Ve, T. (deposition date: 2020-12-24, release date: 2021-03-10, Last modification date: 2024-01-31)

Primary citation

Clabbers, M.T.B.,Holmes, S.,Muusse, T.W.,Vajjhala, P.R.,Thygesen, S.J.,Malde, A.K.,Hunter, D.J.B.,Croll, T.I.,Flueckiger, L.,Nanson, J.D.,Rahaman, M.H.,Aquila, A.,Hunter, M.S.,Liang, M.,Yoon, C.H.,Zhao, J.,Zatsepin, N.A.,Abbey, B.,Sierecki, E.,Gambin, Y.,Stacey, K.J.,Darmanin, C.,Kobe, B.,Xu, H.,Ve, T.
MyD88 TIR domain higher-order assembly interactions revealed by microcrystal electron diffraction and serial femtosecond crystallography.
Nat Commun, 12:2578-2578, 2021

PubMed Abstract: 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 (MAL) forms filaments in vitro and induces formation of crystalline higher-order assemblies of the MyD88 TIR domain (MyD88). 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 MyD88 assembly, which reveal a two-stranded higher-order assembly arrangement of TIR domains analogous to that seen previously for MAL. We demonstrate via mutagenesis that the MyD88 assembly interfaces are critical for TLR4 signaling in vivo, and we show that MAL promotes unidirectional assembly of MyD88. Collectively, our studies provide structural and mechanistic insight into TLR signal transduction and allow a direct comparison of the MicroED and SFX techniques.

PubMed: 33972532
DOI: 10.1038/s41467-021-22590-6

Experimental method

ELECTRON CRYSTALLOGRAPHY (3 Å)