Has an E3 ubiquitin ligase activity . Ubiquitinates DTNBP1 (dysbindin) and promotes its degradation . May ubiquitinate BBS2 . Ubiquitinates PIAS4/PIASY and promotes its degradation in keratinocytes treated with UVB and TNF-alpha (By similarity). Also acts as a regulator of autophagy by mediating formation of unanchored 'Lys-63'-linked polyubiquitin chains that activate ULK1: interaction with AMBRA1 is required for ULK1 activation . ; (Microbial infection) May play a significant role in mediating the biological activity of the HIV-1 Tat protein in vivo . Binds specifically to the activation domain of HIV-1 Tat and can also interact with the HIV-2 and EIAV Tat proteins in vivo .
Cytoplasm . Localized in cytoplasmic bodies, often located around the nucleus. .
Spleen, thymus, prostate, testis, ovary, intestine, colon and skeletal muscle.
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