Peptide presentation by the MHC class Ib molecule, H2-M3

Geoffrey P. Smith, Vikram M. Dabhi, Eric G. Pamer, Kirsten Fischer Lindahl

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The presentation of N-formylated peptides to cytotoxic T cells is restricted to the mouse class I MHC molecule, H2-M3. Previous studies have shown that M3 is unable to present unformylated peptldes. We demonstrate that the unformylated ND1 peptide can sensitize M3wt-transfected fibroblasts for killing by ND1-specific cytotoxlc T cells. At 1 /M, both N-formylated and unformylated ND1 peptides induced equivalent levels of killing. However, the concentrations required for half maximal killing differed by 104-fold, from 10-50 pM for N-formylated ND1 to 100 nM for unformylated ND1. The peptide binding groove of M3 differs from other class I molecules at three highly conserved positions: 34 (V→Q), 167 (W→L) and 171 (Y→F). Site-directed mutagenesis was used to determine the importance of these changes In the presentation of N-formylated peptldes by M3. Cell lines expressing the mutations Q34V, L167W or F171Y all presented the N-formylated ND1 peptide equally well to ND1-specific T cells. The N-formylated ND1 peptide was also presented by a triple mutant, containing substitutions at all three positions. Q34, L167 and F171 are therefore not required individually, nor in combination, for the presentation of N-formylated peptides by M3. However, all three point mutations did affect killing by alloreactive, M3-specific T cells. F171Y was the least damaging mutation, affecting only one of the two T cell lines tested. By contrast, both T cell lines failed to kill Q34V and L167W targets. Q34 and L167 are thus important determinants In the M3-speciflc CTL response.

Original languageEnglish (US)
Pages (from-to)1917-1926
Number of pages10
JournalInternational Immunology
Volume6
Issue number12
DOIs
StatePublished - Dec 1994

Fingerprint

T-cells
Peptides
N-Formylmethionine Leucyl-Phenylalanine
Molecules
T-Lymphocytes
Mutation
Cell Line
Line
Site-directed mutagenesis
Mutagenesis
Site-Directed Mutagenesis
Fibroblasts
Point Mutation
p.m.
Class
Presentation
Cell line
Mutant
Substitution
Mouse

Keywords

  • AAformyl methionine
  • Listeria monocytogenes
  • Maternally transmitted antigen
  • Non-classical MHC
  • Site-directed mutagenesis
  • T cell recognition

ASJC Scopus subject areas

  • Statistics, Probability and Uncertainty
  • Applied Mathematics
  • Public Health, Environmental and Occupational Health
  • Neuropsychology and Physiological Psychology
  • Transplantation
  • Immunology

Cite this

Smith, G. P., Dabhi, V. M., Pamer, E. G., & Fischer Lindahl, K. (1994). Peptide presentation by the MHC class Ib molecule, H2-M3. International Immunology, 6(12), 1917-1926. https://doi.org/10.1093/intimm/6.12.1917

Peptide presentation by the MHC class Ib molecule, H2-M3. / Smith, Geoffrey P.; Dabhi, Vikram M.; Pamer, Eric G.; Fischer Lindahl, Kirsten.

In: International Immunology, Vol. 6, No. 12, 12.1994, p. 1917-1926.

Research output: Contribution to journalArticle

Smith, GP, Dabhi, VM, Pamer, EG & Fischer Lindahl, K 1994, 'Peptide presentation by the MHC class Ib molecule, H2-M3', International Immunology, vol. 6, no. 12, pp. 1917-1926. https://doi.org/10.1093/intimm/6.12.1917
Smith, Geoffrey P. ; Dabhi, Vikram M. ; Pamer, Eric G. ; Fischer Lindahl, Kirsten. / Peptide presentation by the MHC class Ib molecule, H2-M3. In: International Immunology. 1994 ; Vol. 6, No. 12. pp. 1917-1926.
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