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© Biologie structurale et chimie
Structure du domaine en doigt de zinc de la protéine NEMO, déterminée par Résonance magnétique nucléaire (RMN). Cette protéine jouant un rôle dans des maladies (cancer, inflammation), les connaissances acquises sur sa structure offrent de précieuses informations sur sa fonction.
Publication : The Journal of cell biology

TNF and IL-1 exhibit distinct ubiquitin requirements for inducing NEMO-IKK supramolecular structures

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The Journal of cell biology - 20 Jan 2014

Tarantino N, Tinevez JY, Crowell EF, Boisson B, Henriques R, Mhlanga M, Agou F, Israël A, Laplantine E

Link to Pubmed [PMID] – 24446482

J. Cell Biol. 2014 Jan;204(2):231-45

Nuclear factor κB (NF-κB) essential modulator (NEMO), a regulatory component of the IκB kinase (IKK) complex, controls NF-κB activation through its interaction with ubiquitin chains. We show here that stimulation with interleukin-1 (IL-1) and TNF induces a rapid and transient recruitment of NEMO into punctate structures that are anchored at the cell periphery. These structures are enriched in activated IKK kinases and ubiquitinated NEMO molecules, which suggests that they serve as organizing centers for the activation of NF-κB. These NEMO-containing structures colocalize with activated TNF receptors but not with activated IL-1 receptors. We investigated the involvement of nondegradative ubiquitination in the formation of these structures, using cells deficient in K63 ubiquitin chains or linear ubiquitin chain assembly complex (LUBAC)-mediated linear ubiquitination. Our results indicate that, unlike TNF, IL-1 requires K63-linked and linear ubiquitin chains to recruit NEMO into higher-order complexes. Thus, different mechanisms are involved in the recruitment of NEMO into supramolecular complexes, which appear to be essential for NF-κB activation.

https://www.ncbi.nlm.nih.gov/pubmed/24446482