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Sökning: WFRF:(Farnebo F) > (2010-2014)

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  • Hansson, EM, et al. (författare)
  • Control of Notch-ligand endocytosis by ligand-receptor interaction
  • 2010
  • Ingår i: Journal of cell science. - : The Company of Biologists. - 1477-9137 .- 0021-9533. ; 123:17Pt 17, s. 2931-2942
  • Tidskriftsartikel (refereegranskat)abstract
    • In Notch signaling, cell-bound ligands activate Notch receptors on juxtaposed cells, but the relationship between ligand endocytosis, ubiquitylation and ligand-receptor interaction remains poorly understood. To study the specific role of ligand-receptor interaction, we identified a missense mutant of the Notch ligand Jagged1 (Nodder, Ndr) that failed to interact with Notch receptors, but retained a cellular distribution that was similar to wild-type Jagged1 (Jagged1WT) in the absence of active Notch signaling. Both Jagged1WT and Jagged1Ndr interacted with the E3 ubiquitin ligase Mind bomb, but only Jagged1WT showed enhanced ubiquitylation after co-culture with cells expressing Notch receptor. Cells expressing Jagged1WT, but not Jagged1Ndr, trans-endocytosed the Notch extracellular domain (NECD) into the ligand-expressing cell, and NECD colocalized with Jagged1WT in early endosomes, multivesicular bodies and lysosomes, suggesting that NECD is routed through the endocytic degradation pathway. When coexpressed in the same cell, Jagged1Ndr did not exert a dominant-negative effect over Jagged1WT in terms of receptor activation. Finally, in Jag1Ndr/Ndr mice, the ligand was largely accumulated at the cell surface, indicating that engagement of the Notch receptor is important for ligand internalization in vivo. In conclusion, the interaction-dead Jagged1Ndr ligand provides new insights into the specific role of receptor-ligand interaction in the intracellular trafficking of Notch ligands.
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