Acts as a RAC1 guanine nucleotide exchange factor (GEF). Interacts with PAK kinases through the SH3 domain. Interacts with GIT1. Component of cytoplasmic complexes, which also contain PXN, GIT1 and PAK1 (By similarity). Interacts with PARVB. Interacts with BIN2. Identified in a complex with BIN2 and GIT2. Ubiquitous.