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Intracellular processes associated with glycoprotein transport and processing.

A Slomiany¹, E Grzelinska, M Grabska

¹Research Center, University of Medicine and Dentistry of New Jersey, Newark 07103-2400.

Archives of Biochemistry and Biophysics

|October 1, 1992

Summary

This study quantifies mucus glycoprotein precursor (apomucin) transport from the ER to Golgi using vesicles. It reveals vesicle membrane composition and lipid dynamics during fusion with Golgi, highlighting sphingomyelin synthesis.

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Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Intracellular transport is crucial for protein modification and secretion.
Mucus glycoprotein precursors (apomucins) are synthesized in the ER and processed in the Golgi.
Understanding the dynamics of transport vesicles is key to cellular function.

Purpose of the Study:

To quantitate the intracellular transport of apomucin from the ER to the Golgi.
To analyze the lipid composition and dynamics of apomucin-carrying transport vesicles.
To investigate the membrane fusion process between transport vesicles and the Golgi apparatus.

Main Methods:

Immunoprecipitation using antimucin monoclonal antibody to quantify apomucin.
Estimation of apomucin glycosylation using UDP-[3H]galactose.

Related Experiment Videos

Electron microscopy to assess vesicle assembly and morphology.

Quantitation of radiolabeled lipid precursor incorporation ([14C]choline, [14C]ethanolamine, [14C]oleic acid).

Main Results:

Transport vesicles (80-100 nm) carry apomucin and are enriched in phosphoglycerides and ceramides.
Vesicle lipids were incorporated into Golgi membranes upon fusion.
Sphingomyelin synthesis occurred during vesicle-Golgi fusion, with phosphatidylcholine conversion to sphingomyelin in the Golgi.

Conclusions:

Newly synthesized apomucin transport vesicles have membranes rich in phosphoglycerides and ceramides.
Vesicle fusion with the Golgi involves lipid exchange, replenishing Golgi membranes with sphingomyelin.
This study elucidates the lipid dynamics and membrane transformations during apomucin intracellular transport.