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p230 is associated with vesicles budding from the trans-Golgi network
P.A. Gleeson, T.J. Anderson, J.L. Stow, G. Griffiths, B.H. Toh, F. Matheson
Journal of Cell Science 1996 109: 2811-2821;

Summary

Transport vesicle formation requires the association of cytosolic proteins with the membrane. We have previously described a brefeldin-A sensitive, hydrophilic protein (p230), containing a very high frequency of heptad repeats, found in the cytosol and associated with Golgi membranes. We show here that p230 is localised on the trans-Golgi network, by immunogold labeling of HeLa cell cryosections using alpha 2,6 sialyltransferase as a compartment-specific marker. The role of G protein activators on the binding of p230 to Golgi membranes and in vesicle biogenesis has been investigated. Treatment of streptolysin-O permeabilised HeLa cells with either GTP gamma S or AlF4- resulted in accumulation of p230 on Golgi membranes. Furthermore, immunolabeling of isolated Golgi membranes treated with AlF4-, to induce the accumulation of vesicles, showed that p230 is predominantly localised to the cytoplasmic surface of trans-Golgi network-derived budding structures and small coated vesicles. p230-labeled vesicles have a thin (approximately 10 nm) electron dense cytoplasmic coat and could be readily distinguished from clathrin-coated vesicles. Dual immunogold labeling of perforated cells, or of cryosections of treated Golgi membranes, revealed that p230 and the trans-Golgi network-associated p200, which we show here to be distinct molecules, appear to be localised on separate populations of vesicles budding from the trans-Golgi network. These results strongly suggest the presence of distinct populations of non-clathrin coated vesicles derived from the trans-Golgi network. As p230 recycles between the cytosol and buds/vesicles of TGN membranes, a process regulated by G proteins, we propose that p230 is involved in the biogenesis of a specific population of non-clathrin coated vesicles.

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Journal Articles
p230 is associated with vesicles budding from the trans-Golgi network
P.A. Gleeson, T.J. Anderson, J.L. Stow, G. Griffiths, B.H. Toh, F. Matheson
Journal of Cell Science 1996 109: 2811-2821;
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