Is a positive regulator of NF-kappa-B signaling downstream of TLR4 activation. It acts as a scaffold molecule to assemble a molecular complex that includes TRAF6, MAP3K7, CHUK and IKBKB, thereby facilitating NF-kappa-B signaling activation. Regulates TRAF6 and MAP3K7 ubiquitination. Involved in the regulation of cell mobility. Regulates lipolysaccharide (LPS)-induced endothelial cell migration. Is involved in the regulation of skin pigmentation through the control of melanocyte migration in the epidermis. Interacts with GNAS. Interacts with IQGAP1. Interacts with TRAF6 (via C-terminus); the interaction is LPS-dependent. Interacts with MAP3K7, CHUK and IKBKB. Expressed in the microvascular endothelium of various organs, as well as in parenchymal cells. Expressed in the endothelium but not lymphoid cells of spleen and thymus.