4C0M

Crystal Structure of the N terminal domain of wild type TRIF (TIR- domain-containing adapter-inducing interferon-beta)

Summary for 4C0M

• Entry DOI: 10.2210/pdb4c0m/pdb
• Related: 4BSX
• Descriptor: TIR DOMAIN-CONTAINING ADAPTER MOLECULE 1 (1 entity in total)
• Functional Keywords: immune system, toll-like receptor adaptor protein, innate immunity, tetratrico-peptide repeat (tpr), ifit proteins
• Biological source: HOMO SAPIENS (HUMAN)
• Total number of polymer chains: 4
• Total formula weight: 68084.92

Authors

Ullah, M.O.,Ve, T.,Mangan, M.,Alaidarous, M.,Sweet, M.J.,Mansell, A.,Kobe, B. (deposition date: 2013-08-05, release date: 2013-12-11, Last modification date: 2023-12-20)

Primary citation

Ullah, M.O.,Ve, T.,Mangan, M.,Alaidarous, M.,Sweet, M.J.,Mansell, A.,Kobe, B.
The Tlr Signalling Adaptor Trif/Ticam-1 Has an N-Terminal Helical Domain with Structural Similarity to Ifit Proteins
Acta Crystallogr.,Sect.D, 69:2420-, 2013

PubMed Abstract: TRIF/TICAM-1 (TIR domain-containing adaptor inducing interferon-β/TIR domain-containing adaptor molecule 1) is the adaptor protein in the Toll-like receptor (TLR) 3 and 4 signalling pathway that leads to the production of type 1 interferons and cytokines. The signalling involves TIR (Toll/interleukin-1 receptor) domain-dependent TRIF oligomerization. A protease-resistant N-terminal region is believed to be involved in self-regulation of TRIF by interacting with its TIR domain. Here, the structural and functional characterization of the N-terminal domain of TRIF (TRIF-NTD) comprising residues 1-153 is reported. The 2.22 Å resolution crystal structure was solved by single-wavelength anomalous diffraction (SAD) using selenomethionine-labelled crystals of TRIF-NTD containing two additional introduced Met residues (TRIF-NTDA66M/L113M). The structure consists of eight antiparallel helices that can be divided into two subdomains, and the overall fold shares similarity to the interferon-induced protein with tetratricopeptide repeats (IFIT) family of proteins, which are involved in both the recognition of viral RNA and modulation of innate immune signalling. Analysis of TRIF-NTD surface features and the mapping of sequence conservation onto the structure suggest several possible binding sites involved in either TRIF auto-regulation or interaction with other signalling molecules or ligands. TRIF-NTD suppresses TRIF-mediated activation of the interferon-β promoter, as well as NF-κB-dependent reporter-gene activity. These findings thus identify opportunities for the selective targeting of TLR3- and TLR4-mediated inflammation.

PubMed: 24311583
DOI: 10.1107/S0907444913022385

Experimental method

X-RAY DIFFRACTION (2.8 Å)