National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
米国
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2025 タイトル: Structural basis for TIR domain-mediated innate immune signaling by Toll-like receptor adaptors TRIF and TRAM. 著者: Mohammad K Manik / Mengqi Pan / Le Xiao / Weixi Gu / Hyoyoung Kim / Sabrina Pospich / Andrew Hedger / Parimala R Vajjhala / Morris Y L Lee / Xiaoqi Qian / Michael J Landsberg / Thomas Ve / ...著者: Mohammad K Manik / Mengqi Pan / Le Xiao / Weixi Gu / Hyoyoung Kim / Sabrina Pospich / Andrew Hedger / Parimala R Vajjhala / Morris Y L Lee / Xiaoqi Qian / Michael J Landsberg / Thomas Ve / Jeffrey D Nanson / Stefan Raunser / Katryn J Stacey / Hao Wu / Bostjan Kobe / 要旨: Innate immunity relies on Toll-like receptors (TLRs) to detect pathogen-associated molecular patterns. The TIR (Toll/interleukin-1 receptor) domain-containing TLR adaptors TRIF (TIR domain-containing ...Innate immunity relies on Toll-like receptors (TLRs) to detect pathogen-associated molecular patterns. The TIR (Toll/interleukin-1 receptor) domain-containing TLR adaptors TRIF (TIR domain-containing adaptor-inducing interferon-β) and TRAM (TRIF-related adaptor molecule) are essential for MyD88-independent TLR signaling. However, the structural basis of TRIF and TRAM TIR domain-based signaling remains unclear. Here, we present cryo-EM structures of filaments formed by TRIF and TRAM TIR domains at resolutions of 3.3 Å and 5.6 Å, respectively. Both structures reveal two-stranded parallel helical arrangements. Functional studies underscore the importance of intrastrand interactions, mediated by the BB-loop, and interstrand interactions in TLR4-mediated signaling. We also report the crystal structure of the monomeric TRAM TIR domain bearing the BB loop mutation C117H, which reveals conformational differences consistent with its inactivity. Our findings suggest a unified signaling mechanism by the TIR domains of the four signaling TLR adaptors MyD88, MAL, TRIF, and TRAM and reveal potential therapeutic targets for immunity-related disorders.
TIRdomain-containingadaptermolecule1 / TICAM-1 / Proline-rich / vinculin and TIR domain-containing protein B / Putative NF-kappa-B- ...TICAM-1 / Proline-rich / vinculin and TIR domain-containing protein B / Putative NF-kappa-B-activating protein 502H / Toll-interleukin-1 receptor domain-containing adapter protein inducing interferon beta / MyD88-3 / TIR domain-containing adapter protein inducing IFN-beta
分子量: 58531.676 Da / 分子数: 6 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: TICAM1, PRVTIRB, TRIF プラスミド: pcDNA3 TEV-GFP-FLAG LIC cloning vector (6LD) 詳細 (発現宿主): Modified LIC 6D backbone with a C-terminal TEV-GFP-FLAG tag. Derived from Scott Gradia's pcDNA3.1 LIC 6D by Liron David. 発現宿主: Mammalian expression vector Flag-MCS-pcDNA3.1 (その他) 参照: UniProt: Q8IUC6
Has protein modification
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実験情報
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実験
実験
手法: 電子顕微鏡法
EM実験
試料の集合状態: FILAMENT / 3次元再構成法: らせん対称体再構成法
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試料調製
構成要素
名称: TRIF TIR Filament Cryo-EM Structure / タイプ: CELL / Entity ID: all / 由来: RECOMBINANT