4 research outputs found
Coreceptor affinity for MHC defines peptide specificity requirements for TCR interaction with coagonist peptide-MHC
Get PDFMapping the sugar dependency for rational generation of a DNA-RNA hybrid-guided Cas9 endonuclease
No full textNonstimulatory peptide–MHC enhances human T-cell antigen-specific responses by amplifying proximal TCR signaling
No full textLigand-engaged TCR is triggered by Lck not associated with CD8 coreceptor
No full textThe earliest molecular events in T cell recognition have not yet been fully described, and the initial T cell receptor (TCR) triggering mechanism remains a subject of controversy. Here, using TIRF/FRET microscopy, we observe a two-stage interaction between TCR, CD8, and MHCp. There is an early (within seconds) interaction between CD3ζ and the coreceptor CD8 that is independent of the binding of CD8 to MHC, but that requires CD8 association with Lck. Later (several minutes) CD3ζ-CD8 interactions require CD8-MHC binding. Lck can be found free or bound to the coreceptor. This work indicates that the initial TCR triggering event is induced by free Lck
