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The manganese cation disrupts membrane dynamics along the secretory pathway

M C Towler1, A R Prescott, J James

  • 1Department of Biochemistry, University of Dundee, Dundee, DD1 5EH, United Kingdom.

Experimental Cell Research
|August 16, 2000
PubMed

Insights

Manganese disrupts the Golgi apparatus and endoplasmic reticulum (ER), fragmenting the Golgi and affecting the ER network. This suggests manganese inhibits motor proteins, offering a new tool for studying protein secretion and membrane dynamics.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The endoplasmic reticulum (ER) and Golgi apparatus are crucial for protein folding, assembly, and transport.
  • These organelles are integral to the cell's secretory pathway.

Purpose of the Study:

  • To investigate the effects of the divalent cation manganese on the Golgi apparatus and ER.
  • To explore manganese as a potential tool for studying protein secretion and membrane dynamics.

Main Methods:

  • Treatment of cells with manganese.
  • Microscopic analysis of Golgi apparatus and ER structure.
  • Observation of protein localization within organelles.

Main Results:

  • Manganese treatment caused fragmentation of the Golgi apparatus into smaller, dispersed structures.
  • Key Golgi proteins (TGN46, beta1,4-galactosyltransferase, giantin, GM130) remained segregated within fragments.
  • The ER network was affected, with peripheral elements collapsing.
  • Observed effects suggest manganese inhibits motor proteins linking organelles to the cytoskeleton.

Conclusions:

  • Manganese significantly disrupts the structure of the Golgi apparatus and ER.
  • The findings support the role of motor proteins in maintaining organelle structure and function.
  • Manganese emerges as a novel reagent for investigating protein secretion and membrane dynamics.

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