Sequestration of TRAF2 into Stress Granules Interrupts Tumor Necrosis Factor Signaling Under Stress Conditions

Overview

Journal Mol Cell Biol

Specialty Cell Biology

Date 2005 Mar 4

PMID 15743837

Citations 111

Authors

Woo Jae Kim

Sung Hoon Back

Vit Kim

Incheol Ryu

Sung Key Jang

Affiliations

Soon will be listed here.

Abstract

The cellular stress response (SR) is a phylogenetically conserved protection mechanism that involves inhibition of protein synthesis through recruitment of translation factors such as eIF4G into insoluble stress granules (SGs) and blockade of proinflammatory responses by interruption of the signaling pathway from tumor necrosis factor alpha (TNF-alpha) to nuclear factor-kappaB (NF-kappaB) activation. However, the link between these two physiological phenomena has not been clearly elucidated. Here we report that eIF4GI, which is a scaffold protein interacting with many translation factors, interacts with TRAF2, a signaling molecule that plays a key role in activation of NF-kappaB through TNF-alpha. These two proteins colocalize in SGs during cellular exposure to stress conditions. Moreover, TRAF2 is absent from TNFR1 complexes under stress conditions even after TNF-alpha treatment. This suggests that stressed cells lower their biological activities by sequestration of translation factors and TRAF2 into SGs through a protein-protein interaction.

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