Enables mitogen-activated protein kinase kinase kinase binding activity. Involved in negative regulation of glial cell apoptotic process; positive regulation of NF-kappaB transcription factor activity; and tumor necrosis factor-mediated signaling pathway. Located in cell cortex and membrane raft. Part of protein-containing complex. Orthologous to human TRAF2 (TNF receptor associated factor 2). [provided by Alliance of Genome Resources, Apr 2022]