Analysis of the role of p200-containing vesicles in post-Golgi traffic

E Ikonen, RG Parton, F Lafont and K Simons

Cell Biology Programme, European Molecular Biology Laboratory, Heidelberg, Germany.

p200 is a cytoplasmic protein that associates with vesicles budding from the trans-golgi network (TGN). The protein was identified by a monoclonal antibody AD7. We have used this antibody to analyze whether p200 functions in exocytic transport from the TGN to the apical or basolateral plasma membrane in Madin-Darby canine kidney cells. We found that transport of the viral marker proteins, influenza hemagglutinin (HA) to the apical surface or vesicular stomatitis virus glycoprotein (VSV G) to the basolateral surface in streptolysin O- permeabilized cells was not affected when p200 was depleted from both the membranes and the cytosol. When vesicles isolated from perforated cells were analyzed by equilibrium density gradient centrifugation, the p200 immunoreactive membranes did not comigrate with either the apical vesicle marker HA or the basolateral vesicle marker VSV G. Immunoelectron microscopy of perforated and double-labeled cells showed that the p200 positive vesicular profiles were not labeled by antibodies to HA or VSV G when the viral proteins were accumulated in the TGN. Furthermore, the p200-decorated vesicles were more electron dense than those labeled with the viral antibodies. Together, these results suggest that p200 does not function in the transport pathways that carry HA from the TGN to the apical surface or VSV G from the TGN to the basolateral surface.

Volume 7, Issue 6, pp. 961-974, 06/01/1996
Copyright © 1996 by The American Society for Cell Biology

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