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Updated: Apr 4, 2026

Density Gradient Ultracentrifugation for Investigating Endocytic Recycling in Mammalian Cells
Published on: June 30, 2021
Rab and Arf G proteins in endosomal trafficking
Dipannita Dutta1, Julie G Donaldson1
1Cell Biology and Physiology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA.
None:
Endocytosis is a fundamental process that cells use to remove receptors, extracellular material, plasma membrane proteins and lipids from the cell surface. After entry into cells, the cargo proteins are subsequently trafficked to late endosomes and lysosomes for degradation, to the Golgi complex, or to recycling endosomes for return to the plasma membrane. Small G proteins in the Rab and Arf family are present on endosomes and coordinate the trafficking of cargo proteins. Here we describe some basic experimental approaches to begin to study the endosomal trafficking of a given cell surface protein.
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