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- W2152498364 abstract "Abstract In resting T cells, Csk is constitutively localized in lipid rafts by virtue of interaction with a phosphorylated adaptor protein, Csk-binding protein (Cbp)/phosphoprotein associated with glycolipid-enriched microdomains, and sets an activation threshold in TCR signaling. In this study, we examined a kinase responsible for Cbp phosphorylation in T cell membrane rafts. By analyzing T cells from Fyn−/− mice, we clearly demonstrated that Fyn, but not Lck, has its kinase activity in membrane rafts, and plays a critical role in Cbp phosphorylation, Cbp-Csk interaction, and Csk kinase activity. Naive CD44lowCD62 ligandhigh T cells were substantially reduced in Fyn−/− mice, presumably due to the inhibition of Cbp phosphorylation. Thus, Fyn mediates Cbp-Csk interaction and recruits Csk to rafts by phosphorylating Cbp. Csk recruited to rafts would then be activated and inhibit the kinase activity of Lck to keep resting T cells in a quiescent state. Our results elucidate a negative regulatory role for Fyn in proximal TCR signaling in lipid rafts." @default.
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- W2152498364 date "2002-09-15" @default.
- W2152498364 modified "2023-09-26" @default.
- W2152498364 title "Cutting Edge: Fyn Is Essential for Tyrosine Phosphorylation of Csk-Binding Protein/Phosphoprotein Associated with Glycolipid-Enriched Microdomains in Lipid Rafts in Resting T Cells" @default.
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- W2152498364 doi "https://doi.org/10.4049/jimmunol.169.6.2813" @default.
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