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Published on: February 9, 2021
Inhibition of secretion by 1,3-Cyclohexanebis(methylamine), a dibasic compound that interferes with coatomer function
1The Molecular and Cell Biology Department, The University of Texas at Dallas, Richardson, Texas 75083-0688, USA.
1,3-cyclohexanebis(methylamine) (CBM) inhibits coatomer binding to Golgi membranes, impacting cellular secretion. However, Golgi integrity and ER-to-Golgi transport remain intact, suggesting COPI is not essential for these processes.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Aminoglycoside antibiotics inhibit coatomer binding to Golgi membranes.
- This inhibition is mediated by specific amino groups mimicking the KKXX motif.
- Coat protein I (COPI) is crucial for vesicle transport within the cell.
Purpose of the Study:
- To investigate the effects of 1,3-cyclohexanebis(methylamine) (CBM) on cellular secretion in vivo.
- To determine if CBM, a compound with similar amino groups to aminoglycosides, affects coatomer binding and Golgi function.
- To elucidate the role of COPI in Golgi integrity and intracellular transport.
Main Methods:
- In vitro and in vivo experiments assessing coatomer binding to Golgi membranes.
- Measurement of cellular secretion in the presence of CBM.
- Microscopic analysis of Golgi complex localization and fusion with the endoplasmic reticulum (ER).
- Assessment of ER to Golgi transport in CBM-treated cells.
Main Results:
- CBM inhibited coatomer binding to Golgi membranes both in vitro and in vivo.
- CBM treatment inhibited secretion by intact cells.
- Despite reduced coatomer binding, Golgi integrity and perinuclear localization were maintained.
- ER to Golgi transport was not blocked by CBM.
- Transport through the Golgi to the plasma membrane was impaired.
Conclusions:
- A full complement of COPI is not essential for maintaining Golgi integrity or ER-to-Golgi transport.
- COPI is necessary for efficient transport from the Golgi complex to the plasma membrane.
- CBM serves as a valuable tool for dissecting COPI-dependent transport pathways.
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