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Rho GTPases play a fundamental role in numerous cellular processes that are initiated by extracellular stimuli that work through Gucleotide exchange protein coupled receptors. Acts as guanine nucleotide exchange factor (GEF) for RhoA and RAC1 GTPases. Binding of APC may activate RAC1 GEF activity. The APC-ARHGEF4 complex seems to be involved in cell migration as well as in E-cadherin-mediated cell-cell adhesion. This protein is similar to rat collybistin protein. Alternative splicing of the gene generates two transcript variants which encode different isoforms.
