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 consolidate 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. Raw data files were processed using an early version of MaxQuant software. In the first step, peak lists files (.msm files) for SILAC medium- and heavy-labeled peptide as well as unassigned labeling state were generated using the Quant.exe. These files were submitted to Mascot (version 2.3.01) search engine using Ensemble Human (GRCh37.59), in house generated, target decoy database.