Related Experiment Videos
Freeze-fractured Acholeplasma laidlawii membranes: nature of particles observed
Science (New York, N.Y.)
|January 5, 1973
Abstract:
Freeze-fracture of Acholeplasma laidlawii membranes from cells incubated in the presence of puromycin or omission of amino acids reveals a decrease in the number of particles between 50 and 100 angstroms in the hydrophobic fracture plane, which strongly suggests that these particles are protein. Additional evidence indicates that they may be involved in substrate transport.
Insights
Researchers used freeze-fracture to study Acholeplasma laidlawii membranes. Findings suggest membrane particles are proteins potentially involved in transporting substances across the cell.
Area of Science:
- Membrane biology
- Cellular biochemistry
Background:
- Acholeplasma laidlawii is a bacterium lacking a cell wall.
- Cell membranes are crucial for cellular integrity and transport.
- Understanding membrane composition is key to understanding cell function.
Purpose of the Study:
- To investigate the nature of particles observed in Acholeplasma laidlawii cell membranes.
- To determine the potential function of these membrane particles.
Main Methods:
- Freeze-fracture electron microscopy was employed on Acholeplasma laidlawii cell membranes.
- Cells were treated with puromycin or deprived of amino acids prior to analysis.
Main Results:
- A reduction in membrane-associated particles (50-100 angstroms) was observed under experimental conditions.
- These particles are located in the hydrophobic plane of the membrane.
Conclusions:
- The observed particles are strongly suggested to be proteins.
- Evidence points towards a role for these proteins in substrate transport across the cell membrane.