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Updated: Jul 7, 2026

Production, Crystallization, and Structure Determination of the IKK-binding Domain of NEMO
Published on: December 28, 2019
NEMO recognition of ubiquitinated Bcl10 is required for T cell receptor-mediated NF-kappaB activation
Chuan-Jin Wu1, Jonathan D Ashwell
1Laboratory of Immune Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
Abstract:
The mechanism by which the Carma1-Bcl10-MALT1 (CBM) complex couples T cell antigen receptor (TCR) signaling to IkappaB kinase (IKK) and NF-kappaB activation is not known. Here, we show that Bcl10 undergoes K63-linked polyubiquitination in response to T cell activation and subsequently binds NEMO, the regulatory subunit of IKK. This interaction requires the ubiquitin-binding activity of NEMO. The sites of Bcl10 ubiquitination were mapped to K31 and K63. Mutation of these residues did not affect TCR signaling-induced CBM complex assembly but prevented Bcl10 ubiquitination, NEMO binding, and NF-kappaB activation. Therefore, the regulated ubiquitination of Bcl10 and its recognition by NEMO are a critical link between the CBM complex, IKK recruitment, and NF-kappaB activation.
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