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Autoantigenic epitopes on eukaryotic L7

A H von Mikecz1, P H Hemmerich, H H Peter

  • 1Lehrstuhl für Immunologie, Fakultät für Biologie, Universität Konstanz, Freiburg, Germany.

Clinical and Experimental Immunology
|May 1, 1995
PubMed
Summary
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Autoantibodies from patients with systemic autoimmune diseases frequently target ribosomal protein L7. This study identified three distinct autoepitopes on L7, with one N-terminal epitope showing cross-reactivity with fungal homologues, indicating conserved binding sites.

Area of Science:

  • Immunology
  • Molecular Biology
  • Autoimmunity

Background:

  • Ribosomal protein L7 is a novel autoantigen in systemic autoimmune diseases.
  • Autoantibodies against L7 are found in up to 75% of systemic lupus erythematosus patients and 50% of mixed connective tissue disease and progressive systemic sclerosis patients.

Purpose of the Study:

  • To investigate the B cell response to ribosomal protein L7.
  • To identify the specific immunogenic determinants (autoepitopes) recognized by autoantibodies in patients with systemic rheumatic diseases.

Main Methods:

  • Generation of eighteen truncated fragments of ribosomal protein L7 as recombinant glutathione-S-transferase fusions.
  • Examination of fragment reactivity with patient sera using immunoblotting.

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Main Results:

  • Autoantibodies target three major, non-overlapping autoepitopes on ribosomal protein L7.
  • Two epitopes are located in the conserved C-terminal region, while one is in the N-terminal region.
  • The N-terminal epitope (24 amino acids) shows cross-reactivity with a homologous protein (RPL7) in Dictyostelium discoideum, indicating conserved residues (14VPE...KKR22) are crucial for autoantibody binding.

Conclusions:

  • Ribosomal protein L7 harbors multiple autoepitopes targeted by autoantibodies in systemic autoimmune diseases.
  • Conserved amino acid residues in the N-terminal region are essential for autoantibody recognition and may explain cross-reactivity with homologous proteins.