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Related Experiment Videos

Interactions formed by individually expressed TAP1 and TAP2 polypeptide subunits.

Antony N Antoniou1, Stuart Ford, Elizabeth S Pilley

  • 1Division of Cell Biology and Immunology, School of Life Sciences, University of Dundee, Dundee, UK.

Immunology
|June 6, 2002
PubMed
Summary

Single transporter associated with antigen processing (TAP) subunits, TAP1 and TAP2, can independently bind major histocompatibility complex (MHC) class I molecules and form peptide-loading complexes. These findings offer insights into ATP-binding cassette (ABC) transporter function.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • The transporter associated with antigen processing (TAP) is crucial for presenting antigens to the immune system.
  • TAP functions as a heterodimer of TAP1 and TAP2, transporting peptides into the endoplasmic reticulum for MHC class I binding.

Purpose of the Study:

  • To investigate the individual functions and interactions of TAP1 and TAP2 subunits.
  • To explore the capabilities of single TAP polypeptide subunits in forming functional complexes.

Main Methods:

  • Immunoprecipitation of rat TAP1 and TAP2 in a human TAP-deficient cell line (T2).
  • Expression of various HLA-encoding recombinant vaccinia viruses.
  • Chemical cross-linking experiments.

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Main Results:

  • Both TAP1 and TAP2 individually bound endogenous HLA-A2 and -B51 molecules.
  • TAP1 and TAP2 showed similar interaction capabilities with diverse MHC class I alleles.
  • Single TAP subunits formed MHC class I peptide-loading complexes and retained ATP-binding capacity.
  • TAP2, but not TAP1, formed homodimers.

Conclusions:

  • Individual TAP subunits possess key features of the TAP heterodimer.
  • Single TAP subunits serve as valuable models for studying ATP-binding cassette (ABC) transporters.
  • Understanding TAP subunit function is vital for comprehending antigen presentation pathways.