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J. Cell Biol.,
Volume 140, Number 3, February 9, 1998 541-551
Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146
Secretory proteins enter the Golgi apparatus
when transport vesicles fuse with the cis-side and exit in
transport vesicles budding from the trans-side. Resident
Golgi enzymes that have been transported in the cis-to-trans direction with the secretory flow must be recycled constantly by retrograde transport in the opposite
direction. In this study, we describe the functional characterization of Golgi-derived transport vesicles that
were isolated from tissue culture cells. We found that
under the steady-state conditions of a living cell, a fraction of resident Golgi enzymes was found in vesicles
that could be separated from cisternal membranes. These vesicles appeared to be depleted of secretory
cargo. They were capable of binding to and fusion with
isolated Golgi membranes, and after fusion their enzymatic contents most efficiently processed cargo that
had just entered the Golgi apparatus. Those results indicate a possible role for these structures in recycling of Golgi enzymes in the Golgi stack.
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