Identification of Proteins Involved in Endosome Fusion: Implications for Toxin Activity

  • James M. Lenhard
  • Maria I. Colombo
  • Michael Koval
  • Guangpu Li
  • Luis S. Mayorga
  • Philip D. Stahl


Endocytosis of proteins is a fundamental aspect of protein transport required for cell survival. Binding of a number of ligands including hormones, growth factors, nutrients and antigens to cell-surface receptors initiates internalization of these macromolecules. The receptor-ligand complexes that form at the cell surface sequester within clathrin-coated pits and the pits pinch off the plasma membrane to form coated vesicles1. After uncoating, the vesicles fuse with other endocytic vesicles, the compartment acidifies and the ligands dissociate from their receptors2. The lumenal contents of the endocytic vesicles are commonly delivered to lysosomes or the Golgi apparatus while the majority of the membrane components are recycled to the plasma membrane3.


Cholera Toxin Okadaic Acid Early Endosome Endocytic Vesicle Transport Machinery 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1993

Authors and Affiliations

  • James M. Lenhard
    • 1
  • Maria I. Colombo
    • 1
  • Michael Koval
    • 1
  • Guangpu Li
    • 1
  • Luis S. Mayorga
    • 1
  • Philip D. Stahl
    • 1
  1. 1.Department of Cell Biology and PhysiologyWashington University School of MedicineSt. LouisUSA

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