Involved in regulation of TNF-alpha induced NF-kappa-B activation and apoptosis. Involved in modulation of 'Lys-48'-linked polyubiquitination status of TRAF2 and decreases association of TRAF2 with RIPK1. Required for PTS1 target sequence-dependent protein import into peroxisomes and PEX5 stability; may cooperate with PEX6. In vitro involved in PEX5 export from the cytosol to peroxisomes (By similarity). Interacts with PKN1 (By similarity). Interacts with TRAF2. Interacts with mono- and polyubiquitin. Interacts with PEX6. Interacts with PEX5 (Cys-linked ubiquitinated) (By similarity). Widely expressed with high level in heart, skeletal muscle, liver, kidney and placenta. The A20-type zinc finger domain mediates regulation of NF-kappa-B activity. The AN1-type zinc finger domain mediates association with TRAF2.