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Characterization of the interaction between CD45 and CD45-AP
1Department of Pathology, Roger Williams Medical Center-Brown University, Providence, Rhode Island 02908, USA.
The Journal of Biological Chemistry
|September 8, 1995
Summary
Researchers identified CD45-AP, a protein that binds to CD45 (a leukocyte-specific phosphatase) at the plasma membrane. This interaction is crucial for CD45-mediated immune signal transduction pathways.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- CD45 (leukocyte-specific protein tyrosine phosphatase) is essential for immune cell signaling.
- Understanding CD45 interactions is key to elucidating immune response pathways.
Purpose of the Study:
- To identify and characterize proteins that interact with CD45.
- To elucidate the molecular mechanism of CD45-AP binding to CD45.
Main Methods:
- Cloning of CD45-AP.
- Binding analysis using deleted or chimeric forms of CD45-AP and CD45.
- Proteolysis resistance assay.
- Amino acid sequence prediction for membrane orientation.
Main Results:
- A novel 30-kDa phosphorylated protein, CD45-AP, was identified and cloned.
- CD45-AP specifically associates with CD45 via their transmembrane domains.
- CD45-AP is a transmembrane protein with a short extracellular N-terminus and a large cytoplasmic domain.
- CD45-AP is resistant to proteolysis on intact cells.
Conclusions:
- CD45-AP interacts with CD45 at the plasma membrane.
- The cytoplasmic domain of CD45-AP likely functions as an adapter protein.
- CD45-AP directs CD45 interactions within signal transduction pathways.
