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Related Experiment Videos

Tapasin is required for efficient peptide binding to transporter associated with antigen processing.

S Li1, K M Paulsson, S Chen

  • 1Tumor Immunology, Lund University, Solvegatan 21, s-22362 Lund, Sweden. su-ling.li@wblab.lu.se

The Journal of Biological Chemistry
|January 15, 2000
PubMed
Summary

Tapasin is crucial for efficient peptide binding to the transporter associated with antigen processing (TAP). This interaction is essential for proper major histocompatibility complex (MHC) class I assembly and function.

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Distinct differences in association of MHC class I with endoplasmic reticulum proteins in wild-type, and beta 2-microglobulin- and TAP-deficient cell lines.

International immunology·2001

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • The transporter associated with antigen processing (TAP) moves peptides into the endoplasmic reticulum (ER) for MHC class I assembly.
  • Tapasin, a TAP complex subunit, binds TAP1 and MHC class I, and is vital for MHC class I assembly and surface expression.

Purpose of the Study:

  • To investigate tapasin's role in antigenic peptide processing.
  • To clarify the interaction between peptides, TAP, and MHC class I in the presence and absence of tapasin.

Main Methods:

  • Utilized tapasin mutant (721.220) and tapasin-expressing (721.221) cell lines, including HLA-A2 transfectants.
  • Analyzed peptide binding to TAP, peptide transport across ER membranes, and peptide-MHC class I association.

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Main Results:

  • Peptide binding to TAP was significantly reduced in tapasin-deficient cells (721.220) compared to tapasin-expressing cells (721.221).
  • Impaired peptide-TAP interaction led to defective peptide transport in tapasin mutant cells, although the transport rate of bound peptides was not significantly altered.
  • Restoration of efficient peptide-TAP interaction occurred after transfecting tapasin cDNA into 721.220 cells.

Conclusions:

  • Tapasin is essential for effective peptide binding to the transporter associated with antigen processing (TAP).
  • This study highlights tapasin's critical role in initiating the antigen processing pathway by facilitating peptide-TAP interactions.