Related Experiment Videos
Purification and characterization of a liver-specific antigen
Journal of Immunology (Baltimore, Md. : 1950)
|May 1, 1976
Summary
Researchers isolated and characterized a liver-specific antigen (F-antigen) found in mammals but not birds or frogs. This protein antigen was purified using chromatography, revealing its molecular weight and electrophoretic properties.
Area of Science:
- Immunology
- Biochemistry
- Proteomics
Background:
- A liver-specific antigen, termed F-antigen, was previously identified in BALB/c mouse liver extracts.
- Initial detection was achieved through double immunodiffusion techniques.
Purpose of the Study:
- To isolate and characterize the F-antigen.
- To determine its distribution across different species.
- To elucidate its biochemical properties.
Main Methods:
- Double immunodiffusion
- Immunoelectrophoresis
- Ammonium sulfate precipitation
- Gel filtration (Sephadex G-200)
- Ion-exchange chromatography (DEAE-Sephadex A-50)
- SDS polyacrylamide gel electrophoresis (SDS-PAGE)
Main Results:
- The F-antigen was widely distributed in mammalian liver extracts but absent in avian and frog liver extracts.
- It exhibited electrophoretic mobility similar to serum beta2-globulins, was thermolabile, and precipitated between 30-70% ammonium sulfate saturation.
- Chromatographic methods localized the antigenicity to specific fractions, with SDS-PAGE revealing polypeptide components of approximately 75,000, 72,000, and 93,000 m.w.
Conclusions:
- The F-antigen is a protein or closely protein-associated molecule.
- Its purification and characterization provide insights into mammalian liver-specific proteins.
- Further investigation into its function and role is warranted.