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TAPBPR isoforms exhibit altered association with MHC class I.

Keith M Porter1, Clemens Hermann, James A Traherne

  • 1Department of Pathology, Cambridge Institute of Medical Research, University of Cambridge, Wellcome Trust, Cambridge, UK.

Immunology
|January 22, 2014
PubMed
Summary
This summary is machine-generated.

Alternative splicing of the tapasin-related protein (TAPBPR) gene generates diverse protein isoforms. These isoforms impact the binding and regulation of MHC class I molecules, suggesting crucial roles in immune responses.

Keywords:
TAPBPR/TAPBPLantigen presentation/processing alternative splicingtapasin-related

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • The tapasin-related protein (TAPBPR) is involved in antigen processing and presentation.
  • TAPBPR interacts with MHC class I and β2-microglobulin.

Purpose of the Study:

  • To investigate alternatively spliced TAPBPR transcripts and their protein products.
  • To understand the functional consequences of different TAPBPR isoforms on MHC class I binding and regulation.

Main Methods:

  • Analysis of alternatively spliced TAPBPR transcripts from the TAPBPL gene.
  • Investigation of three TAPBPR protein isoforms at a protein level.
  • Assessment of MHC class I binding and surface expression regulation by TAPBPR variants.

Main Results:

  • Transcripts lacking exon 5 resulted in loss of the IgC domain and impaired MHC class I binding.
  • Alternative splicing in exon 4 produced truncated TAPBPR products.
  • A longer TAPBPR isoform with an additional exon showed attenuated ability to down-regulate surface MHC class I.
  • Alternative TAPBPR transcripts are abundant in peripheral blood mononuclear cells and dendritic cells.

Conclusions:

  • Alternative splicing of TAPBPR generates functional protein isoforms with distinct properties.
  • These isoforms play significant roles in modulating MHC class I presentation in vivo.
  • Understanding TAPBPR isoforms is crucial for comprehending immune regulation.