Tandem peptide epitopes facilitate CD4-dependent activation of T cell clones

John D. Hayball, Sarah J. Fidler, Deborah Palliser, Ann D M Rees, Jonathan R. Lamb, Richard A. Lake

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Peptides that consist of two tandemly repeated epitopes joined by a flexible linker have an increased affinity for class II molecules and are more potent at inducing proliferation of T cell clones than monomeric epitopes. The increase in potency of peptides with two epitopes for individual T cell clones is proportional to the relative CD4 dependence of the clones. We show that epitope dimers activate T cell clones that respond sub-optimally to monomeric epitopes presented by APC from HIV-infected donors. We hypothesize that HIV+ APC normally fail to stimulate the clones because virally encoded gp120 sequesters CD4 from the activation complex, but epitope dimers overcome this effect because they are better able to recruit CD4. The αβ heterodimer of human class II (HLA-DR1) is further ordered as a dimer of heterodimers (superdimer) at least in its crystal form. Since class II molecules have an open-ended antigen binding groove, the superdimer is theoretically permissive of stable binding of two peptide epitopes linked in tandem. Our data support a role for the MHC class II dimer of heterodimers in amplifying the proliferative response of T cells to antigen by dint of the superdimers having a higher affinity for CD4 than the nominal class II αβ heterodimers.

Original languageEnglish (US)
Pages (from-to)148-153
Number of pages6
JournalImmunology and Cell Biology
Volume75
Issue number2
StatePublished - 1997
Externally publishedYes

Fingerprint

T-cells
Epitopes
Clone Cells
Chemical activation
T-Lymphocytes
Dimers
Peptides
HLA-DR1 Antigen
HIV
Antigens
Molecules
T-Lymphocyte Epitopes
Crystals

Keywords

  • dimer of heterodimers
  • human immunodeficiency virus
  • linked epitopes
  • major histocompatibility complex class II

ASJC Scopus subject areas

  • Immunology
  • Clinical Biochemistry
  • Cell Biology

Cite this

Hayball, J. D., Fidler, S. J., Palliser, D., Rees, A. D. M., Lamb, J. R., & Lake, R. A. (1997). Tandem peptide epitopes facilitate CD4-dependent activation of T cell clones. Immunology and Cell Biology, 75(2), 148-153.

Tandem peptide epitopes facilitate CD4-dependent activation of T cell clones. / Hayball, John D.; Fidler, Sarah J.; Palliser, Deborah; Rees, Ann D M; Lamb, Jonathan R.; Lake, Richard A.

In: Immunology and Cell Biology, Vol. 75, No. 2, 1997, p. 148-153.

Research output: Contribution to journalArticle

Hayball, JD, Fidler, SJ, Palliser, D, Rees, ADM, Lamb, JR & Lake, RA 1997, 'Tandem peptide epitopes facilitate CD4-dependent activation of T cell clones', Immunology and Cell Biology, vol. 75, no. 2, pp. 148-153.
Hayball JD, Fidler SJ, Palliser D, Rees ADM, Lamb JR, Lake RA. Tandem peptide epitopes facilitate CD4-dependent activation of T cell clones. Immunology and Cell Biology. 1997;75(2):148-153.
Hayball, John D. ; Fidler, Sarah J. ; Palliser, Deborah ; Rees, Ann D M ; Lamb, Jonathan R. ; Lake, Richard A. / Tandem peptide epitopes facilitate CD4-dependent activation of T cell clones. In: Immunology and Cell Biology. 1997 ; Vol. 75, No. 2. pp. 148-153.
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