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Molecular Anatomy of a Trafficking Organelle.by: Shigeo Takamori, Matthew Holt, Katinka Stenius, Edward A A Lemke, Mads Grønborg, Dietmar Riedel, Henning Urlaub, Stephan Schenck, Britta Brügger, Philippe Ringler, Shirley A A Müller, Burkhard Rammner, Frauke Gräter, Jochen S S Hub, Bert L L De Groot, Gottfried Mieskes, Yoshinori Moriyama, Jürgen Klingauf, Helmut Grubmüller, John Heuser, Felix Wieland, Reinhard Jahn
Cell, Vol. 127, No. 4. (17 November 2006), pp. 831-846.
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AbstractMembrane traffic in eukaryotic cells involves transport of vesicles that bud from a donor compartment and fuse with an acceptor compartment. Common principles of budding and fusion have emerged, and many of the proteins involved in these events are now known. However, a detailed picture of an entire trafficking organelle is not yet available. Using synaptic vesicles as a model, we have now determined the protein and lipid composition; measured vesicle size, density, and mass; calculated the average protein and lipid mass per vesicle; and determined the copy number of more than a dozen major constituents. A model has been constructed that integrates all quantitative data and includes structural models of abundant proteins. Synaptic vesicles are dominated by proteins, possess a surprising diversity of trafficking proteins, and, with the exception of the V-ATPase that is present in only one to two copies, contain numerous copies of proteins essential for membrane traffic and neurotransmitter uptake.
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