The SCF?-TrCP E3 Ubiquitin Ligase Regulates Immune Receptor Signaling by Targeting the Negative Regulatory Protein TIPE2.
TNFAIP8-like 2 (TIPE2) is a negative regulator of immune receptor signaling that maintains immune homeostasis. Dysregulated TIPE2 expression has been observed in several types of human immunological disorders. However, how TIPE2 expression is regulated remains to be determined. We report in this study that the SCF?-TrCP E3 ubiquitin ligase regulates ... TIPE2 protein abundance by targeting it for ubiquitination and subsequent degradation via the 26S proteasome. Silencing of either cullin-1 or ?-TrCP1 resulted in increased levels of TIPE2 in immune cells. TAK1 phosphorylated the Ser3 in the noncanonical degron motif of TIPE2 to trigger its interaction with ?-TrCP for subsequent ubiquitination and degradation. Importantly, the amount of TIPE2 protein in immune cells determined the strength of TLR 4-induced signaling and downstream gene expression. Thus, our study has uncovered a mechanism by which SCF?-TrCP E3 ubiquitin ligase regulates TLR responses.
Mesh Terms:
Animals, Cells, Cultured, HEK293 Cells, Humans, Intracellular Signaling Peptides and Proteins, Mice, Mice, Inbred C57BL, RAW 264.7 Cells, SKP Cullin F-Box Protein Ligases, Signal Transduction, THP-1 Cells
Animals, Cells, Cultured, HEK293 Cells, Humans, Intracellular Signaling Peptides and Proteins, Mice, Mice, Inbred C57BL, RAW 264.7 Cells, SKP Cullin F-Box Protein Ligases, Signal Transduction, THP-1 Cells
J Immunol
Date: Dec. 15, 2019
PubMed ID: 32188758
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