E3 ubiquitin ligase that, together with UBE2N and UBE2V1, mediates the synthesis of 'Lys-63'-linked-polyubiquitin chains conjugated to proteins, such as IKBKG, IRAK1, AKT1 and AKT2 (PubMed:
11057907, PubMed:
18347055, PubMed:
19713527, PubMed:
19465916). Also mediates ubiquitination of free/unanchored polyubiquitin chain that leads to MAP3K7 activation (PubMed:
19675569). Leads to the activation of NF-kappa-B and JUN (PubMed:
16378096, PubMed:
17135271). Seems to also play a role in dendritic cells (DCs) maturation and/or activation (By similarity). Represses c-Myb-mediated transactivation, in B-lymphocytes (PubMed:
18093978, PubMed:
18758450). Adapter protein that seems to play a role in signal transduction initiated via TNF receptor, IL-1 receptor and IL-17 receptor (PubMed:
8837778, PubMed:
19825828, PubMed:
12140561). Regulates osteoclast differentiation by mediating the activation of adapter protein complex 1 (AP-1) and NF- kappa-B, in response to RANK-L stimulation (By similarity). Together with MAP3K8, mediates CD40 signals that activate ERK in B-cells and macrophages, and thus may play a role in the regulation of immunoglobulin production (By similarity).