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Abstract:
The cell membrane of Mycoplasma hominis was isolated by lysing the cells with digitonin. Electron microscopy and chemical, density gradient, and electrophoretic analyses of the membrane proteins showed the membranes so obtained, like those isolated by osmotic lysis, to be relatively free of cytoplasmic contaminants. Sensitivity to digitonin lysis depended on temperature but was not affected by Mg(2+) ions and was only slightly affected by the age of the culture. Accordingly, it seems that digitonin may be used for the isolation of cell membranes from sterol-requiring mycoplasmas that tend to be fairly resistant to osmotic lysis.
Insights
Digitonin effectively isolates Mycoplasma hominis cell membranes, offering a superior method for sterol-requiring mycoplasmas resistant to osmotic lysis. This technique yields pure membranes for further analysis.
Area of Science:
- Microbiology
- Cell Biology
- Biochemistry
Background:
- Mycoplasma hominis cell membrane isolation is crucial for studying its unique biology.
- Sterol-requiring mycoplasmas often exhibit resistance to conventional osmotic lysis methods.
Purpose of the Study:
- To evaluate digitonin as a lysis agent for isolating Mycoplasma hominis cell membranes.
- To compare the purity of membranes isolated by digitonin versus osmotic lysis.
Main Methods:
- Cell lysis using digitonin at varying temperatures.
- Analysis of isolated membranes via electron microscopy, chemical assays, density gradient centrifugation, and electrophoresis.
Main Results:
- Digitonin lysis yielded Mycoplasma hominis membranes relatively free of cytoplasmic contaminants.
- Digitonin lysis effectiveness was temperature-dependent but unaffected by Mg(2+) ions or culture age.
- Digitonin offers an alternative to osmotic lysis for resistant Mycoplasma species.
Conclusions:
- Digitonin is a suitable agent for isolating cell membranes from sterol-requiring mycoplasmas.
- This method provides a pure membrane fraction for biochemical and structural studies.