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Characterization of Coated Vesicles that Participate in Endocytic Recycling
Author(s) -
Peters Peter J.,
Gao Minggeng,
Gaschet Joelle,
Ambach Andreas,
Van Donselaar Elly,
Traverse John F.,
Bos Erik,
Wolffe Elizabeth J.,
Hsu Victor W.
Publication year - 2001
Publication title -
traffic
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.677
H-Index - 130
eISSN - 1600-0854
pISSN - 1398-9219
DOI - 10.1034/j.1600-0854.2001.21204.x
Subject(s) - vesicle , endosome , endocytosis , biology , microbiology and biotechnology , endocytic cycle , transferrin receptor , clathrin adaptor proteins , vesicular transport proteins , biochemistry , membrane , transferrin , receptor , intracellular , vacuolar protein sorting
While the recycling pathway of endocytosis has been shown to participate in many cellular functions, little is known regarding the transport carriers that mediate this pathway. In this study, we overexpressed a point mutant of ADP‐ribosylation factor 6 (ARF6), that perturbs its GTPase cycle, to accumulate endosome‐derived coated vesicles. Characterization by their purification revealed that, upon cell homogenization, these vesicles were mostly aggregated with larger noncoated membranes, and could be released with high‐salt treatment. Equilibrium centrifugation revealed that these vesicles had buoyant density similar to the COP‐coated vesicles. To purify the ARF6‐regulated vesicles to homogeneity, enriched fractions from equilibrium centrifugation were subjected to immunoisolation through the hemagglutinin (HA) epitope of the mutant ARF6, by using a newly developed, high‐affinity, anti‐HA monoclonal antibody. Surface iodination of the purified vesicles revealed multiple prominent proteins. Immunoblotting with antibodies against subunits of the currently known coat proteins suggested that these vesicles have a novel coat complex. These vesicles are carriers for endocytic recycling, because they are enriched for transferrin receptor and also the v‐SNARE cellubrevin that functions in transport from the recycling endosome to the plasma membrane. Thus, we have characterized transport vesicles that participate in endocytic recycling.