![]()
|
|
||||||||
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Papers In Press, published online ahead of print August 31, 2004
CIQUIBIC-Departamento de Química Biológica, Universidad Nacional de Cordoba, Córdoba, Córdoba 5000
Corresponding Author: daniotti{at}dqb.fcq.unc.edu.ar
Gangliosides, complex glycosphingolipids containing sialic acids, have been found to reside in glycosphingolipid-enriched microdomains (GEM) at the plasma membrane. They are synthesized in the lumen of the Golgi complex and appear unable to translocate from the lumenal toward the cytosolic surface of Golgi membrane to access the monomeric lipid transport. As a consequence, they can only leave the Golgi complex via the lumenal surface of transport vesicles. In this work, we analyzed the exocytic transport of the disialo ganglioside GD3 from trans-Golgi network (TGN) to plasma membrane in CHO-K1 cells, by immunodetection of endogenously synthesized GD3. We found that ganglioside GD3, unlike another luminal membrane-bounded lipid (glycosylphosphatidylinositol-anchored protein), did not partition into GEM domains in the Golgi complex and trafficked from TGN to plasma membrane by a BFA-insensitive exocytic pathway. Moreover, dominant negative form of Rab11, which prevent exit of vesicular stomatitis virus glycoprotein (VSVG) from the Golgi complex, did not influence the capacity of GD3 to reach the cell surface. Our results strongly support the notion that most ganglioside GD3 traffics from TGN to plasma membrane by a non-conventional vesicular pathway where lateral membrane segregation of VSVG (non-GEM resident) and GPI-anchored proteins (GEM resident) from GD3 is required before exiting TGN.
J. Biol. Chem, 10.1074/jbc.M407181200
Submitted on June 25, 2004
Revised on August 31, 2004
Accepted on August 31, 2004
Ganglioside GD3 traffics from trans-Golgi network to plasma membrane by a Rab11-independent and brefeldin A-insensitive exocytic pathway
![]()
CiteULike
Complore
Connotea
Del.icio.us
Digg
Reddit
Technorati What's this?
This article has been cited by other articles:
![]() |
A. S. Uliana, P. M. Crespo, J. A. Martina, J. L. Daniotti, and H. J. F. Maccioni Modulation of GalT1 and SialT1 Sub-Golgi Localization by SialT2 Expression Reveals an Organellar Level of Glycolipid Synthesis Control J. Biol. Chem., October 27, 2006; 281(43): 32852 - 32860. [Abstract] [Full Text] [PDF] |
||||
![]() |
J. K. VanSlyke and L. S. Musil Cytosolic Stress Reduces Degradation of Connexin43 Internalized from the Cell Surface and Enhances Gap Junction Formation and Function Mol. Biol. Cell, November 1, 2005; 16(11): 5247 - 5257. [Abstract] [Full Text] [PDF] |
||||
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
| All ASBMB Journals | Molecular and Cellular Proteomics |
| Journal of Lipid Research | ASBMB Today |