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. 2012 Apr 9;209(4):761–774. doi: 10.1084/jem.20112095

Figure 7.

Figure 7.

The effect of mutation of MR1 residues on MAIT TCR activation. (A) 13 mutant MR1, as well as wild-type MR1 (C1R.WT) and parental C1R, cell lines were either not infected (open bars) or infected (shaded bars) with S. typhimurium at a multiplicity of infection (MOI) of 1. After infection, Jurkat.TRBV 20, Jurkat.TRBV 6–1, or Jurkat.TRBV 6–4 cell lines were then added for 16 h before measurement of increase in CD69 surface expression (MFI) by staining and flow cytometric analysis. This experiment was performed twice with similar results. Mutant Arg167Ala MR1 C1R cells activated Jurkat.MAIT cells similarly to wild-type MR1 C1R cells (not depicted). The experiment was also performed at an MOI of 10 with similar results (not depicted). (B) The effects of the MR1 mutants were mapped onto the human MR1 homology model. Mutations that had no impact on MAIT TCR activation is shown in gray; impact on autoreactivity is shown in orange; mutants that markedly reduced MAIT TCR activation are shown in red.