Plays a role in protein ubiquitination, sorting and degradation through its association with VCP. Involved in ubiquitin-mediated membrane proteins trafficking to late endosomes in an ESCRT-dependent manner, and hence plays a role in synaptic vesicle recycling (By similarity. May play a role in macroautophagy, regulating for instance the clearance of damaged lysosomes. Plays a role in cerebellar Purkinje cell development (By similarity. Positively regulates cytosolic and calcium-independent phospholipase A2 activities in a tumor necrosis factor alpha (TNF-alpha- or lipopolysaccharide (LPS-dependent manner, and hence prostaglandin E2 biosynthesis.,PLAA,DOA1,PLA2P,PLAP,NDMSBA,Immunology & Inflammation,Cell Intrinsic Innate Immunity Signaling Pathway,PLAA