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Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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In vivo and in vitro Studies of Adaptor-clathrin Interaction
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Clathrin coated pits, plaques and adhesion.

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Summary

Clathrin-mediated endocytosis (CME) is vital for cellular uptake. This review questions the standard CME model, highlighting its inability to explain diverse clathrin-coated structures and suggesting new research directions.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Clathrin-mediated endocytosis (CME) is the primary mechanism for receptor internalization in mammalian cells.
  • The canonical model describes stochastic clathrin-coated pit formation and growth via clathrin polymerization.
  • This model fails to account for the observed diversity of clathrin-coated structures (CCSs) at the plasma membrane.

Purpose of the Study:

  • To critically evaluate the canonical model of CME.
  • To identify discrepancies between the canonical model and experimental observations.
  • To propose future research directions for understanding CME.

Main Methods:

  • Literature review and synthesis of existing experimental data.
  • Comparative analysis of the canonical CME model with diverse CCS observations.
  • Identification of key areas for future investigation.

Main Results:

  • The canonical CME model is insufficient to explain the variety of CCSs observed.
  • Discrepancies exist regarding pit formation, curvature development, and the role of other cellular components.
  • Endocytic 'hotspots' and the relationship between clathrin-coated pits, plaques, and adhesion sites require further study.

Conclusions:

  • The canonical model of CME requires revision to accommodate observed structural diversity.
  • Further research is needed to elucidate the mechanisms behind various CCSs and endocytic hotspots.
  • Understanding these complexities is crucial for a comprehensive view of cellular internalisation processes.