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Hepatic Golgi fractions resolved into membrane and content subfractions
The Journal of Cell Biology
|March 1, 1982
Summary
Researchers developed a new method to separate Golgi membranes and their contents using sodium carbonate. This technique improves the isolation of Golgi components for further study of liver cell functions.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- The Golgi apparatus is crucial for protein and lipid modification and transport.
- Efficient isolation of Golgi membrane and content fractions is essential for studying its functions.
Purpose of the Study:
- To develop and validate a method for separating Golgi membrane and content subfractions.
- To assess the purity and characteristics of the isolated subfractions.
Main Methods:
- Golgi fractions from rat liver homogenates were treated with 100 mM Na2CO3 (pH 11.3).
- Subfractions were analyzed using electron microscopy and biochemical assays.
- Lipid composition and [33P]phosphate labeling were determined.
Main Results:
- Sodium carbonate treatment effectively extracted content proteins and lipoproteins.
- The membrane subfraction retained 15% of content proteins and lipids.
- The content subfraction showed contamination with membrane fragments and vesicles.
Conclusions:
- The Na2CO3 method provides a robust way to resolve Golgi membrane and content fractions.
- Understanding the composition of these subfractions is key to elucidating Golgi apparatus functions.