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Vol. 9, Issue 6, 1549-1563, June 1998
and
*Membrane Biology Laboratory, Institute of Molecular and Cell
Biology, Singapore 117609, Singapore; and
Synaptobrevins/vesicle-associated membrane proteins (VAMPs)
together with syntaxins and a synaptosome-associated protein of 25 kDa
(SNAP-25) are the main components of a protein complex involved in the
docking and/or fusion of synaptic vesicles with the presynaptic
membrane. We report here the molecular, biochemical, and cell
biological characterization of a novel member of the synaptobrevin/VAMP
family. The amino acid sequence of endobrevin has 32, 33, and 31%
identity to those of synaptobrevin/VAMP-1, synaptobrevin/VAMP-2, and
cellubrevin, respectively. Membrane fractionation studies demonstrate
that endobrevin is enriched in membrane fractions that are also
enriched in the asialoglycoprotein receptor. Indirect
immunofluorescence microscopy establishes that endobrevin is primarily
associated with the perinuclear vesicular structures of the early
endocytic compartment. The preferential association of endobrevin with
the early endosome was further established by electron microscopy (EM)
immunogold labeling. In vitro binding assays show that endobrevin
interacts with immobilized recombinant
European
Molecular Biology Laboratory, 69 Heidelberg, Federal Republic of
Germany
-SNAP fused to glutathione
S-transferase (GST). Our results highlight the general
importance of members of the synaptobrevin/VAMP protein family in
membrane traffic and provide new avenues for future functional and
mechanistic studies of this protein as well as the endocytotic pathway.
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