Acts as an adapter protein of the FYN and LCP2 signaling cascades in T-cells (By similarity). May play a role in linking T-cell signaling to remodeling of the actin cytoskeleton (By similarity). Modulates the expression of IL2 (By similarity). Involved in platelet activation (By similarity). Prevents the degradation of SKAP1 and SKAP2 (By similarity). May be involved in high affinity immunoglobulin epsilon receptor signaling in mast cells (PubMed:12681493). Part of a complex consisting of SKAP2, FYB1 and PTPNS1 (By similarity). Part of a complex consisting of SKAP2, FYB1 and LILRB3 (By similarity). Part of a complex consisting of SKAP1, FYB1 and CLNK (PubMed:12681493). Interacts with CLNK (via its SH2 domain) and FYN; this interaction allows SKAP1 and FYB1 to recruit FYN to the complex, thus promoting the phosphorylation of CLNK by FYN (By similarity). Interacts with FYN (By similarity). Interacts with LCP2 (By similarity). Interacts with SKAP1 (PubMed:12681493). Interacts with SKAP2 (By similarity). Interacts with FASLG (By similarity). Interacts with EVL (By similarity). Interacts with TMEM47 (By similarity). Interacts with LCK (By similarity). Colocalizes with TMEM47 at cell-cell contacts in podocytes. T-cell receptor ligation leads to increased tyrosine phosphorylation.