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(Received for publication, November 14, 1995, and in revised form, April 12, 1996)
From the Department of Cell Biology, Utrecht University School of
Medicine, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
Several Rab GTPases have been localized to
distinct compartments of the endocytic pathway. Rab4 is associated with
early endosomes and recycling vesicles and regulates membrane recycling
from early endosomes. Rab7 is localized to late endosomes and is
involved in the regulation of membrane transport between late endosomes and lysosomes. Although Rab4 and Rab7 appear to regulate distinct transport events in endocytosis, it is not clear whether they perform
their activities in related or entirely distinct intracellular compartments. To address this question, we generated stable cell lines
expressing Rab4 tagged with a novel X31 influenza hemagglutinin (NH)
epitope tag. These antibodies are characterized in this paper and were
used to immunoisolate endocytic vesicles with cytoplasmically exposed
NHRab4. Immunoisolated membranes contain internalized 125I-transferrin, but are devoid of Rab7. Confocal
immunofluorescence microscopy showed that the early endosomal GTPases
Rab4 and Rab5 both do not codistribute with Rab7 within the same cell.
These observations suggest that each of the three Rab GTPases
operationally defines a distinct station of the endocytic pathway.
Volume 271, Number 46,
Issue of November 15, 1996
pp. 29191-29197
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.
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