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Related Experiment Videos

The major histocompatibility complex-encoded proteasome component LMP7: alternative first exons and

R Glynne1, L A Kerr, I Mockridge

  • 1Human Immunogenetics Laboratory, Imperial Cancer Research Fund, London.

European Journal of Immunology
|April 1, 1993
PubMed
Summary

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The LMP7 protein, a component of the proteasome, undergoes N-terminal cleavage before assembly. This study provides the first biochemical evidence for post-translational processing of proteasome subunits.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • The LMP7 gene is located in the major histocompatibility complex class II region.
  • LMP7 shares homology with proteasome subunits and is implicated in antigen processing for MHC class I presentation.

Purpose of the Study:

  • To investigate the structure and processing of the LMP7 protein within the proteasome.
  • To characterize a newly identified LMP7 transcript variant.

Main Methods:

  • Isolation and characterization of LMP7 transcripts.
  • Immunoprecipitation using anti-LMP7 and anti-proteasome antibodies.
  • Western blot analysis.
  • Pulse-chase experiments.

Main Results:

Related Experiment Videos

  • Two LMP7 transcripts were identified, both expressed and interferon-gamma responsive.
  • LMP7 protein is incorporated into the proteasome as a 23 kDa subunit, smaller than predicted.
  • Post-translational N-terminal cleavage of LMP7 precedes its incorporation into the proteasome.

Conclusions:

  • LMP7 undergoes N-terminal post-translational cleavage, a novel finding for proteasome components.
  • This processing is essential for the formation of the mature 23 kDa LMP7 proteasome subunit.