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The mechanism by which TCR signaling activates NF-κB is poorly understood. We demonstrate here that the IKK kinase complex is recruited to the immunological synapse and can be coprecipitated with the TCR after T cell activation. Using ZAP-70-deficient T cells expressing a hybrid molecule between the SH2 domain of ZAP-70 and NEMO/IKKγ, we showed that targeting NEMO to the immunological synapse, and...
The Notch1 receptor is presented at the cell membrane as a heterodimer after constitutive processing by a furin-like convertase. Ligand binding induces the proteolytic release of Notch intracellular domain by a γ-secretase-like activity. This domain translocates to the nucleus and interacts with the DNA-binding protein CSL, resulting in transcriptional activation of target genes. Here we show that...
We have characterized a flat cellular variant of HTLV-1 Tax-transformed rat fibroblasts, 5R, which is unresponsive to all tested NF-κB activating stimuli, and we report here its genetic complementation. The recovered full-length cDNA encodes a 48 kDa protein, NEMO (NF-κB Essential MOdulator), which contains a putative leucine zipper motif. This protein is absent from 5R cells, is part of the high...
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