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Related Experiment Videos

Characterization of the interaction between CD45 and CD45-AP

K Kitamura1, A Maiti, D H Ng

  • 1Department of Pathology, Roger Williams Medical Center-Brown University, Providence, Rhode Island 02908, USA.

The Journal of Biological Chemistry
|September 8, 1995
PubMed
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.

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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:

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  • 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.