EWSR1 associates with the 40S ribosomal subunit and represses translation to maintain endoplasmic reticulum homeostasis.

EWSR1 acts as a selective translational repressor in cancer cells, targeting mRNAs for lipid metabolism and ER homeostasis, and its loss disrupts ER morphology.

• Why it matters: The molecular functions of FET family RNA-binding proteins are incompletely understood, and a missing link is how EWSR1 regulates post-transcriptional control to preserve ER function.
• What they did: The study identifies EWSR1 as a translational repressor that associates with target mRNAs and, via a conserved region spanning two RGG boxes, contributes to association with the 40S ribosomal subunit.
• The result: Loss of EWSR1 impairs activation of the unfolded protein response of the ER (UPRER), defining a novel post-transcriptional role that may relate to FET-associated disease pathogenesis.

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