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13:08
Quantitative Localization of a Golgi Protein by Imaging Its Center of Fluorescence Mass
Published on: August 10, 2017
Golgi structural stability and biogenesis depend on associated PKA activity
Eloy Bejarano1, Margarita Cabrera, Lucia Vega
1Department of Cell Biology, Faculty of Biology, University of Seville, Avd. Reina Mercedes s/n, 41012 Seville, Spain.
Journal of Cell Science
|August 24, 2006
Summary
Protein kinase A is crucial for maintaining the Golgi complex structure. Depleting it causes Golgi disassembly, but fragments retain function, highlighting its role in Golgi ribbon assembly and maintenance.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- The mammalian Golgi complex forms a continuous ribbon structure.
- Protein kinase A (PKA) is associated with the Golgi complex during interphase.
Purpose of the Study:
- To investigate the role of Protein kinase A in Golgi structural maintenance and biogenesis.
- To understand how PKA influences the Golgi ribbon structure.
Main Methods:
- Depletion of PKA regulatory subunits using small interfering RNAs.
- Pharmacological inhibition of PKA holoenzyme.
- Electron microscopy to analyze Golgi structure.
- Studying Golgi reassembly from the endoplasmic reticulum.
Main Results:
- PKA depletion or inhibition led to Golgi complex disassembly into juxtanuclear fragments.
- These fragments maintained polarization and anterograde protein trafficking.
- Golgi reconstruction was arrested at a late stage during reassembly in the presence of PKA inhibitors.
- Electron microscopy revealed fragments as whorl-like structures.
Conclusions:
- Protein kinase A activity is essential for the assembly and maintenance of a continuous Golgi ribbon.
- PKA plays a relevant role in Golgi biogenesis and structural integrity.
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