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The trans-Golgi network: a late secretory sorting station

L M Traub¹, S Kornfeld

¹Division of Hematology, Washington University School of Medicine, St Louis, MO 63110, USA.

Current Opinion in Cell Biology

|August 1, 1997

Summary

Cellular protein sorting at the trans-Golgi network utilizes coat structures to package cargo into vesicles. Recent research illuminates the molecular machinery and intricate processes governing this essential cellular transport.

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Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Proteins synthesized on membrane-bound ribosomes undergo processing and transport.
The Golgi apparatus is a key organelle in protein modification and sorting.
The trans-Golgi network (TGN) serves as a major sorting and distribution hub within the cell.

Purpose of the Study:

To elucidate the molecular mechanisms of protein sorting at the TGN.
To understand the assembly and function of cytosol-oriented coat structures.
To explore the complexity of vesicular transport and protein delivery pathways.

Main Methods:

Investigating protein-protein interactions involved in coat assembly.
Utilizing advanced imaging techniques to visualize transport intermediates.

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Employing biochemical assays to study cargo recognition and packaging.

Main Results:

Identification of key protein components forming the coat structures.
Demonstration of specific cargo recognition by the sorting machinery.
Characterization of distinct vesicular transport intermediates originating from the TGN.

Conclusions:

The TGN employs sophisticated molecular machinery for efficient protein sorting.
Cytosol-oriented coat assembly is critical for packaging proteins into transport vesicles.
Understanding these processes is vital for comprehending cellular organization and function.