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Isolation and characterization of epidermal ribosomes
The Journal of Investigative Dermatology
|February 1, 1975
Summary
Researchers optimized conditions for isolating ribosomal particles from guinea-pig skin and hair root cells. Optimal yields and activity were achieved using specific buffer compositions and extraction methods, revealing particle instability.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- Ribosomal particles are crucial for protein synthesis in eukaryotic cells.
- Understanding optimal isolation conditions is key for studying ribosome function in different tissues.
- Guinea-pig epidermis and hair root cells present unique challenges for ribosome isolation.
Purpose of the Study:
- To determine the optimal conditions for isolating intact and active ribosomal particles from guinea-pig epidermis and hair root cells.
- To investigate the effects of buffer composition, extraction methods, and temperature on ribosome yield and activity.
- To characterize the predominant ribosomal species and their stability post-isolation.
Main Methods:
- Isolation of ribosomal particles using density-gradient centrifugation.
- Varied buffer compositions, including potassium and magnesium ion concentrations.
- Utilized detergent extraction for maximal particle recovery.
- Assessed ribosome activity in an in vitro amino acid-incorporating system.
- Compared wax-epilation and latex methods for hair root preparation.
Main Results:
- Density-gradient patterns were consistent across various isolation conditions, with monomers being predominant.
- Maximal ribosome yield from epidermis and hair roots occurred at 100–250mM potassium and ≤5mM magnesium.
- Optimal in vitro amino acid incorporation activity was observed at 3mM magnesium.
- Wax-epilation inhibited epidermal ribosome activity, but not hair root ribosome activity.
- Isolated ribosomal particles demonstrated instability at 4°C.
Conclusions:
- Specific potassium and magnesium concentrations are critical for maximizing ribosome yield and activity.
- Detergent extraction is essential for efficient recovery of ribosomal particles.
- Tissue-specific preparation methods are required to preserve ribosome activity, particularly for epidermal samples.
- The instability of isolated ribosomes at low temperatures necessitates careful handling and storage.