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Mouse egg ribosomes: evidence for storage in lattices
Journal of Embryology and Experimental Morphology
|April 1, 1981
Summary
Mouse ovum ribosomes, labeled with [3H]uridine, form low-density particles in CsCl gradients. These particles, containing ribosome-like structures in a fibrillar network, suggest a proteinaceous superstructure in oocytes.
Area of Science:
- Cell Biology
- Molecular Biology
- Reproductive Biology
Background:
- Ribosomes are essential for protein synthesis in all cells.
- Understanding ribosome organization within oocytes is crucial for developmental biology.
Purpose of the Study:
- To investigate the structural organization of ribosomes within mouse oocytes.
- To characterize the properties of ribosome-containing particles isolated from mouse ova.
Main Methods:
- Labeling of mouse oocyte ribosomes using [3H]uridine.
- Isolation and characterization of ribosome-containing particles using hypotonic lysis, CsCl density gradients, and ultracentrifugation.
- Electron microscopy for visualizing particle ultrastructure.
Main Results:
- Labeled ribosomes from mouse ova formed low buoyant density particles in CsCl gradients.
- These particles sedimented at low centrifugal forces (≤9000g).
- Electron microscopy revealed ribosome-like particles embedded within a fibrillar network, suggesting a proteinaceous superstructure.
Conclusions:
- Mouse ovum ribosomes exist within a distinct proteinaceous superstructure.
- This superstructure likely corresponds to the lattices observed in situ via transmission electron microscopy.
- The findings provide insights into the unique organization of maternal ribosomes in oocytes.