Quantitative Proteomics Identified TTC4 as a TBK1 Interactor and a Positive Regulator of SeV-Induced Innate Immunity

Proteomics. 2018 Jan;18(2). doi: 10.1002/pmic.201700403.

Abstract

TBK1, STING, and MDA5 are important players within the antiviral innate immune response network. We mapped the interactome of endogenous TBK1, STING, and MDA5 by affinity enrichment MS in virally infected or uninfected THP-1 cells. Based on quantitative data of more than 2000 proteins and stringent statistical analysis, 58 proteins were identified as high-confidence interactors for at least one of three bait proteins. Our data indicated that TBK1 and MDA5 mostly interacted within preexisting protein networks, while STING interacted with different proteins with different viral infections. Functional analysis was performed on 17 interactors, and six were found to have functions in innate immune responses. We identified TTC4 as a TBK1 interactor and positive regulator of sendai virus-induced innate immunity.

Keywords: AE-MS; TTC4; innate immunity; label-free quantification.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • HEK293 Cells
  • Humans
  • Immunity, Innate*
  • Macrophages / immunology
  • Macrophages / metabolism
  • Macrophages / virology
  • Protein Interaction Domains and Motifs
  • Protein Serine-Threonine Kinases / metabolism*
  • Proteomics / methods*
  • Respirovirus Infections / immunology*
  • Respirovirus Infections / metabolism
  • Respirovirus Infections / virology
  • Sendai virus / isolation & purification
  • Sendai virus / physiology*
  • THP-1 Cells
  • Tumor Suppressor Proteins / metabolism*
  • Virus Replication

Substances

  • TTC4 protein, human
  • Tumor Suppressor Proteins
  • Protein Serine-Threonine Kinases
  • TBK1 protein, human