Suppresses polyglutamine (polyQ) aggregation of ATXN3 in neuronal cells (PubMed:27133716). Interacts with SRPK1 (PubMed:19240134). Interacts with HSP70 (HSPA1A or HSPA1B) (PubMed:27133716). Ubiquitous. Extended N-terminus. Extended N-terminus.