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Related Experiment Videos

Isolation of functional, coated, endocytic vesicles.

P G Woodman1, G Warren

  • 1Cell Biology Laboratory, Imperial Cancer Research Fund, London, England.

The Journal of Cell Biology
|March 1, 1991
PubMed
Summary

Researchers isolated functional clathrin-coated vesicles using density gradients and fusion assays. These vesicles retained their structure and were capable of participating in cell-free fusion events, indicating their biological relevance.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Endocytosis is a crucial cellular process for internalizing molecules.
  • Clathrin-coated vesicles mediate a significant pathway of endocytosis.
  • Understanding the function and properties of these vesicles is key to deciphering cellular transport.

Purpose of the Study:

  • To isolate functional clathrin-coated vesicles.
  • To characterize the properties of purified endocytic vesicles.
  • To assess the fusion capabilities of isolated vesicles.

Main Methods:

  • Labeling endocytic vesicles with [125I]transferrin.
  • Purification using 2H2O and 2H2O/Ficoll density gradients.
  • Monitoring purification via a functional fusion assay.

Main Results:

  • Isolated vesicles exhibited characteristics of clathrin-coated vesicles.
  • Purified vesicles were enriched in clathrin coat components.
  • Nearly half of the labeled vesicles participated in cell-free fusion events.
  • Fusion required energy, cytosol, and was inhibited by N-ethyl maleimide.

Conclusions:

  • Functional clathrin-coated vesicles can be isolated using density gradient centrifugation and functional assays.
  • The isolated vesicles maintain their structural integrity and functional capacity for fusion.
  • This methodology provides a means to study the molecular mechanisms of vesicle fusion in vitro.

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