Updated project metadata. The LC-MSMS data correspond to an investigation where we compared global dynamics of TCR signaling in Jurkat cell lines with or without LAT (Linker for activation of T cells). We used triple SILAC labelling. In each experiment two series of time points activation were generated with a common time point that we used to consolidated the two separate time series. The protein extracts in each time series were digested by trypsine and the peptide submitted to SCX fractionation and TiO2 enrichment of phosphopeptides. Each sample was injected 2-3 times.