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• W2802635892 abstract "Cell surface Fc receptors activate inflammation and are tightly controlled to prevent autoimmunity. Antibodies also simulate potent immune signalling from inside the cell via the cytosolic antibody receptor TRIM21, but how this is regulated is unknown. Here we show that TRIM21 signalling is constitutively repressed by its B-Box domain and activated by phosphorylation. The B-Box occupies an E2 binding site on the catalytic RING domain by mimicking E2-E3 interactions, inhibiting TRIM21 ubiquitination and preventing immune activation. TRIM21 is derepressed by IKKβ and TBK1 phosphorylation of an LxxIS motif in the RING domain, at the interface with the B-Box. Incorporation of phosphoserine or a phosphomimetic within this motif relieves B-Box inhibition, promoting E2 binding, RING catalysis, NF-κB activation and cytokine transcription upon infection with DNA or RNA viruses. These data explain how intracellular antibody signalling is regulated and reveal that the B-Box is a critical regulator of RING E3 ligase activity." @default.
• W2802635892 created "2018-05-17" @default.
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• W2802635892 date "2018-04-18" @default.
• W2802635892 modified "2023-10-16" @default.
• W2802635892 title "Intracellular antibody signalling is regulated by phosphorylation of the Fc receptor TRIM21" @default.
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• W2802635892 doi "https://doi.org/10.7554/elife.32660" @default.
• W2802635892 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5906095" @default.
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• W2802635892 hasPublicationYear "2018" @default.
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