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Isolation of hamster brain polyribosomes-cytoskeleton complexes.
1Départment de chimie et biochimie, Université de Moncton, Canada.
Neurochemical Research
|March 1, 1989
Summary
Researchers developed a method to isolate brain polyribosomes and cytoskeletal proteins. This fraction resists disruption by RNase and EDTA, suggesting a stable association between polyribosomes and the cytoskeleton in brain tissue.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Polyribosomes are crucial for protein synthesis.
- Cytoskeletal proteins provide structural support to cells.
- The interaction between polyribosomes and the cytoskeleton is vital for cellular function, particularly in neurons.
Purpose of the Study:
- To develop a method for isolating a brain subcellular fraction enriched in aggregated polyribosomes and cytoskeletal proteins.
- To investigate the mechanism of polyribosome-cytoskeleton association.
- To understand the stability of this association under various conditions.
Main Methods:
- Gentle homogenization of brain tissue.
- Low-speed centrifugation to isolate the subcellular fraction.
- In vitro treatment of the isolated fraction with polyribosome-disaggregating agents (RNase, EDTA, puromycin).
Main Results:
- A method was successfully developed to isolate a brain subcellular fraction rich in aggregated polyribosomes and cytoskeletal proteins.
- RNase and EDTA treatments completely disrupted polyribosomes into monosomes or subunits.
- Despite polyribosome disruption, RNase and EDTA did not release the components from the cytoskeleton, indicating a stable association. Puromycin had no significant effect.
Conclusions:
- The developed method effectively isolates a specific brain subcellular fraction.
- Polyribosomes exhibit a stable association with cytoskeletal structures in the brain.
- This association is resistant to dissociation by common polyribosome-disaggregating agents like RNase and EDTA.