Document Detail

Endoplasmic reticulum-to-cytosol transport of free polymannose oligosaccharides in permeabilized HepG2 cells.
MedLine Citation:
PMID:  8846796     Owner:  NLM     Status:  MEDLINE    
Free polymannose oligosaccharides have recently been localized to both the vesicular and cytosolic compartments of HepG2 cells. Here we investigated the possibility that free oligosaccharides originating in the lumen of the endoplasmic reticulum (ER) are transported directly into the cystosol. Incubation of permeabilized cells in the absence of ATP at 37 degrees C led to the intravesicular accumulation of free Man9GlcNAc2 which was generated from dolichol-linked oligosaccharide in the ER. This oligosaccharide remained stable within the permeabilized cells unless ATP was added to the incubations at which time the Man9GlcNac2 was partially converted to Man8GlcNAc2, and both these components were released from an intravesicular compartment into the cytosolic compartment of permeabilized cells. In contrast, when permeabilized cells, primed with either free triglucosyl-oligosaccharide or a glycotripeptide, were incubated with ATP both these structures remained associated with the intravesicular compartment. As the conditions in which free oligosaccharides were transported out of the intravesicular compartment into the cytosolic compartment did not permit vesicular transport of glycoproteins from the ER to the Golgi apparatus our data demonstrate the presence of a transport process for the delivery of free polymannose oligosaccharides from the ER to the cytosol.
S E Moore; C Bauvy; P Codogno
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The EMBO journal     Volume:  14     ISSN:  0261-4189     ISO Abbreviation:  EMBO J.     Publication Date:  1995 Dec 
Date Detail:
Created Date:  1996-10-21     Completed Date:  1996-10-21     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  8208664     Medline TA:  EMBO J     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  6034-42     Citation Subset:  IM    
Unité de Neuroendocrinologie et Cellulaire Digestives, Institut National de la Santé et de la Recherche Médicale, U410, Faulté de Médicine Xavier Bichat, Paris, France.
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MeSH Terms
Adenosine Triphosphate / metabolism,  pharmacology
Anti-Bacterial Agents / pharmacology
Brefeldin A
Cell Membrane Permeability
Chromatography, Thin Layer
Cyclopentanes / pharmacology
Endoplasmic Reticulum / metabolism*
Glycopeptides / metabolism
Glycoside Hydrolases / metabolism
Mannose / analogs & derivatives,  chemistry,  metabolism*
Oligosaccharides / chemistry,  metabolism*
Saponins / pharmacology
Tumor Cells, Cultured
Reg. No./Substance:
0/Anti-Bacterial Agents; 0/Cyclopentanes; 0/Glycopeptides; 0/Macrolides; 0/Oligosaccharides; 0/Saponins; 20350-15-6/Brefeldin A; 31103-86-3/Mannose; 56-65-5/Adenosine Triphosphate; EC 3.2.1.-/Glycoside Hydrolases

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