Localization of low molecular weight GTP binding proteins to exocytic and endocytic compartments
Authors
Discussion
Loading...
Member takes
Overview
Experimental study demonstrates distinct localization of Rab GTP-binding proteins to secretory and endocytic compartments in mammalian cells, indicating specialized roles in vesicular transport.
Key Points
- To identify and map the subcellular distribution of mammalian low molecular weight GTP-binding proteins homologous to yeast YPT1/SEC4 within the exocytic and endocytic pathways.
- Screened and isolated 11 cDNA clones encoding putative GTP-binding proteins from an MDCK cell cDNA library.
- Localized three specific Rab proteins in mammalian cells using affinity-purified antibodies through immunofluorescence and immunoelectron microscopy.
- Rab2 localized to an intermediate compartment situated between the endoplasmic reticulum and the Golgi apparatus.
- Rab5 localized to the cytoplasmic surface of the plasma membrane and early endosomes, while Rab7 localized specifically to late endosomes.
Cite This Study
Chavrier et al. (1990) studied this question.