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J. Cell Biol.,
Volume 143, Number 4, November 16, 1998 957-971

* Howard Hughes Medical Institute, Department of Molecular and Cellular Physiology, Stanford University School of Medicine,
Stanford, California 94305-5428; and Endocytosis-mediated recycling of plasma
membrane is a critical vesicle trafficking step important
in diverse biological processes. The membrane trafficking decisions and sorting events take place in a series of
heterogeneous and highly dynamic organelles, the endosomes. Syntaxin 13, a recently discovered member of
the syntaxin family, has been suggested to play a role in
mediating endosomal trafficking. To better understand
the function of syntaxin 13 we examined its intracellular distribution in nonpolarized cells. By confocal immunofluorescence and electron microscopy, syntaxin 13 is primarily found in tubular early and recycling endosomes, where it colocalizes with transferrin receptor.
Additional labeling is also present in endosomal vacuoles, where it is often found in clathrin-coated membrane areas. Furthermore, anti-syntaxin 13 antibody inhibits transferrin receptor recycling in permeabilized PC12 cells. Immunoprecipitation of syntaxin 13 revealed that, in Triton X-100 extracts, syntaxin 13 is
present in a complex(es) comprised of
Medical School, University of Utrecht, Institute for Biomembranes, 3584CX Utrecht,
The Netherlands
SNAP, VAMP
2/3, and SNAP-25. This complex(es) binds exogenously
added
SNAP and NSF and dissociates in the presence of ATP, but not ATP
S. These results support a role
for syntaxin 13 in membrane fusion events during the
recycling of plasma membrane proteins.
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