Positively regulates T-cell receptor signaling by enhancing the MAP kinase pathway. Required for optimal conjugation between T-cells and antigen-presenting cells by promoting the clustering of integrin ITGAL on the surface of T-cells. May be involved in high affinity immunoglobulin epsilon receptor signaling in mast cells. Homodimer (PubMed:9195899). Interacts with FYN (PubMed:9195899). Interacts with PTPRC (PubMed:11909961). Interacts with GRB2 when phosphorylated on Tyr-271 (PubMed:12171928). Interacts with FYB1, which is required for SKAP2 protein stability (PubMed:9748251, PubMed:9671755, PubMed:10856234, PubMed:15849195, PubMed:16461356, PubMed:27335501). Part of a complex consisting of SKAP1, FYB1 and CLNK (By similarity). Interacts with RASGRP1 (PubMed:17658605). Interacts with FYB2 (PubMed:27335501). Upon T-cell stimulation, translocates to lipid rafts at the cell membrane. Highly expressed in thymocytes and peripheral blood lymphocytes. Also expressed in spleen cells and testis. Present in T-cells (at protein level). The SH3 domain interacts with FYB1. Phosphorylated on tyrosines. Phosphorylation by FYN on Tyr-271 is required for GRB2 interaction. Phosphorylation by FYN on Tyr-295 abolishes interaction with FYB1. Tyr-232 is dephosphorylated by PTPRC (Probable). Belongs to the SKAP family.