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Membrane antigens of Mycoplasma hominis
Abstract:
Extraction of membranes of Mycoplasma hominis with n-butanol showed that antigenicity was associated with the non-lipid residue, which probably consisted mainly of protein, and not with the lipid itself.Since many membrane proteins are hydrophobic, membranes were rendered soluble in various ways. Extraction with urea or phenol was the most successful, yielding extracts which were both antigenic and serologically reactive. The urea extract could not be fractionated by polyacrylamide disk electrophoresis or by column chromatography. However, serologically active components identified by gel diffusion were separated from detergent-lysed membranes by polyacrylamide disk electrophoresis. The activities of antisera against these fractions suggested that indirect-haemagglutinating or metabolic-inhibiting antibodies can be directed against several different membrane antigens. However, the antigens identified by gel diffusion probably do not represent all the components participating in indirect haemagglutination.Treatment of membrane suspensions with heat, alkali, periodate and various enzymes showed that the four components identified by gel diffusion could be distinguished by their differing stabilities and properties. On the basis of their lability and susceptibility to proteolytic enzymes, two were identified as proteins.
Insights
Mycoplasma hominis membrane antigenicity resides in protein components, not lipids. Urea and phenol extraction successfully isolated these antigenic proteins for further study.
Area of Science:
- Microbiology
- Immunology
- Biochemistry
Background:
- Mycoplasma hominis possesses membrane antigens crucial for serological identification.
- Understanding the biochemical nature of these antigens is vital for diagnostic and research purposes.
Purpose of the Study:
- To determine the biochemical composition of Mycoplasma hominis membrane antigens.
- To characterize the antigenic properties of extracted membrane components.
Main Methods:
- Membrane extraction using n-butanol, urea, and phenol.
- Solubilization of hydrophobic membrane proteins.
- Serological reactivity testing using gel diffusion and indirect hemagglutination assays.
- Fractionation and characterization using polyacrylamide disk electrophoresis and enzyme treatments.
Main Results:
- Antigenicity was localized to the non-lipid residue, primarily proteins.
- Urea and phenol extractions yielded antigenic and serologically reactive components.
- Polyacrylamide disk electrophoresis separated serologically active components from detergent-lysed membranes.
- Differential stability and enzyme susceptibility identified two protein antigens among four components.
Conclusions:
- Mycoplasma hominis membrane antigenicity is primarily associated with proteinaceous material.
- Specific protein antigens within the membrane can elicit immune responses, including indirect hemagglutination and metabolic inhibition.
- Further characterization of these protein antigens is warranted for a comprehensive understanding of Mycoplasma hominis immunology.