Adapter protein that plays a role in the assembling of signaling complexes, being a link between ABL kinases and actin cytoskeleton. Can form complex with ABL1 and CBL, thus promoting ubiquitination and degradation of ABL1 (By similarity). May play a role in the regulation of pancreatic cell adhesion, possibly by acting on WASF1 phosphorylation, enhancing phosphorylation by ABL1, as well as dephosphorylation by PTPN12 (By similarity). Isoform 2 increases water and sodium absorption in the intestine and gall-bladder. Interacts with ABL1/c-Abl, ABL2/v-Abl/Arg, ACTN, CBL and PALLD (By similarity). Interacts with ABL, CBL, DNM1, DNM2, FLOT1, AFDN, PTK2B/PYK2, SAPAP, SPTAN1, SYNJ1, SYNJ2, VCL/vinculin and WASF. Interacts with PTPN12 and WASF1 via its SH3 domains; this interaction may mediate the partial PTPN12 and WASF1 translocation to focal adhesion sites. Detected in the stress fibers, synaptosomal cytosol, postsynaptic density fraction, Z-disks and intercalated. The CBL/PTK2B/ARGBP2 complex is recruited to lipid rafts following growth factor stimulation. In pancreatic acinar cells, localized preferentially to the apical membrane. Colocalized with vinculin and filamentous actin at focal adhesions and lamellipodia of pancreatic cells. Expressed in brain; found in synapses in cerebellum. The first 2 SH3 domains are required for WASF1-binding. All 3 SH3 domains can bind independently to PTPN12. Ubiquitinated by CBL.