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Anaplasma marginale major surface protein 2 CD4+-T-cell epitopes are evenly distributed in conserved and

Jeffrey R Abbott1, Guy H Palmer, Chris J Howard

  • 1Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164, USA.

Infection and Immunity
|November 24, 2004
PubMed

Insights

Anaplasma marginale uses major surface protein 2 (MSP2) variants for immune evasion. Both conserved and hypervariable regions of MSP2 contain T-cell epitopes, while B-cell epitopes are mainly in the hypervariable region.

Area of Science:

  • Immunology
  • Molecular Biology
  • Veterinary Science

Background:

  • Anaplasma marginale causes persistent infections in cattle through antigenic variation of its major surface protein 2 (MSP2).
  • Recombination generates novel MSP2 variants, leading to immune evasion and chronic rickettsemia.
  • Understanding epitope recognition is crucial for developing effective vaccines and control strategies.

Purpose of the Study:

  • To investigate the distribution and recognition of T-cell and B-cell epitopes within the Anaplasma marginale MSP2.
  • To determine if immune evasion is linked to specific epitope responses, particularly within the hypervariable region (HVR).

Main Methods:

  • Localization of T-cell and linear B-cell epitopes by measuring gamma interferon secretion, proliferation, and antibody binding.
  • Analysis of 27 overlapping peptides spanning the Anaplasma marginale MSP2 in 16 infected cattle.
  • Characterization of epitope clusters in conserved and hypervariable regions of MSP2.

Main Results:

  • Similar numbers of CD4+ T-cell epitopes were identified in both conserved and hypervariable regions of MSP2, with comparable response magnitudes.
  • T-cell epitope clusters were found in both the HVR and conserved regions.
  • Linear B-cell epitopes were predominantly located within the HVR, associated with hydrophilic sequences.

Conclusions:

  • The immune response to Anaplasma marginale MSP2 involves T-cell epitopes in both conserved and variable regions.
  • B-cell epitope concentration in the HVR suggests a role in immune evasion and host-pathogen interactions.
  • Protein structure influences epitope recognition patterns by T and B cells, impacting Anaplasma marginale infection dynamics.

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