Related Experiment Videos
Interleukin 2 activates a receptor-associated protein kinase
Journal of Immunology (Baltimore, Md. : 1950)
|September 1, 1987
Summary
The interleukin 2 (IL 2) receptor complex involves two binding molecules. A 78 kDa protein (pp78) co-immunoprecipitates with gp57Tac and is IL 2-responsive, suggesting a phosphorylation signaling mechanism.
Area of Science:
- Immunology
- Molecular Biology
- Cell Signaling
Background:
- The interleukin 2 (IL 2) receptor complex comprises at least two IL 2 binding molecules: gp57Tac (55-57 kDa) and a 75-78 kDa component.
- Understanding the IL 2 receptor's signaling mechanism is crucial for immune response modulation.
Purpose of the Study:
- To investigate the interaction and functional properties of IL 2 receptor components.
- To identify potential signaling molecules associated with the IL 2 receptor complex.
Main Methods:
- Co-immunoprecipitation using anti-gp57Tac antibody.
- In vitro and metabolic phosphorylation assays.
- Analysis of protein phosphorylation in various human and murine cell lines (PBL-T, Jurkat, U937, 2.8.2).
Main Results:
- A 78 kDa protein (pp78) was found to co-immunoprecipitate with gp57Tac.
- pp78 phosphorylation is dependent on IL 2, while gp57Tac phosphorylation is IL 2-independent.
- IL 2-responsive phosphorylation of pp78 and gp57Tac was observed in human T cells (PBL-T, Jurkat) but not in U937 or 2.8.2 cells.
Conclusions:
- The IL 2 receptor complex contains an IL 2-responsive protein kinase activity.
- IL 2 receptor signaling may involve a phosphorylation event mediated by pp78.