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Cargo recognition during clathrin-mediated endocytosis: a team effort
1Department of Pharmacology, University of Colorado Health Sciences Center, Denver, Colorado 80262, USA. alexander.sorkin@uchsc.edu
Current Opinion in Cell Biology
|July 21, 2004
Summary
Transmembrane proteins are sorted into endosomes via clathrin-coated pits, with the AP-2 complex mediating most cargo selection. Alternative adaptors also play key roles, especially for signaling receptors.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Transmembrane proteins are targeted to endosomes through selective internalization at the plasma membrane.
- Clathrin-coated pits and vesicles are crucial for this rapid endocytic process.
- Specificity in cargo selection is achieved through recognition of sequence motifs by coated-pit proteins.
Purpose of the Study:
- To elucidate the mechanisms of transmembrane protein sorting into endosomes.
- To highlight the role of clathrin adaptor protein complex AP-2 in cargo selection.
- To investigate alternative cargo recruitment pathways in clathrin-mediated endocytosis.
Main Methods:
- Analysis of transmembrane protein localization in clathrin-coated pits.
- Investigation of protein-protein interactions involving adaptor proteins.
- Studies on the role of specific sequence motifs in cargo recognition.
Main Results:
- Clathrin-coated pits selectively accumulate transmembrane proteins destined for endosomes.
- The adaptor protein complex AP-2 is the primary mediator of cargo sorting into coated pits in mammalian cells.
- Alternative adaptor proteins facilitate cargo recruitment, particularly for signaling receptors during endocytosis.
Conclusions:
- Cargo recognition by coated-pit proteins ensures specificity in endocytosis.
- While AP-2 is a major sorting mechanism, alternative adaptors are vital for specific endocytic pathways, including those involving signaling receptors.