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AP-2-complex-mediated endocytosis of Drosophila Crumbs regulates polarity by antagonizing Stardust
- Source :
- Journal of cell science. 128(24)
- Publication Year :
- 2015
-
Abstract
- Maintenance of epithelial polarity depends on the correct localization and levels of polarity determinants. The evolutionarily conserved transmembrane protein Crumbs is crucial for the size and identity of the apical membrane, yet little is known about the molecular mechanisms controlling the amount of Crumbs at the surface. Here, we show that Crumbs levels on the apical membrane depend on a well-balanced state of endocytosis and stabilization. The adaptor protein 2 (AP-2) complex binds to a motif in the cytoplasmic tail of Crumbs that overlaps with the binding site of Stardust, a protein known to stabilize Crumbs on the surface. Preventing endocytosis by mutation of AP-2 causes expansion of the Crumbs-positive plasma membrane domain and polarity defects, which can be partially rescued by removing one copy of crumbs. Strikingly, knocking down both AP-2 and Stardust leads to the retention of Crumbs on the membrane. This study provides evidence for a molecular mechanism, based on stabilization and endocytosis, to adjust surface levels of Crumbs, which are essential for maintaining epithelial polarity.
- Subjects :
- animal structures
biology
Membrane transport protein
Signal transducing adaptor protein
Cell Polarity
Membrane Proteins
Membrane Transport Proteins
Epithelial Cells
Cell Biology
Apical membrane
Endocytosis
Transmembrane protein
Cell biology
Drosophila melanogaster
Membrane protein
Transcription Factor AP-2
Cell polarity
biology.protein
Animals
Drosophila Proteins
Guanylate Kinases
Epithelial polarity
Subjects
Details
- ISSN :
- 14779137
- Volume :
- 128
- Issue :
- 24
- Database :
- OpenAIRE
- Journal :
- Journal of cell science
- Accession number :
- edsair.doi.dedup.....586c6be0f7f0dd377a7c7848bb116d47