Involved in the pre-mRNA splicing process (PubMed:28076346, PubMed:28502770). May play a role as regulator of AR transcriptional activity; may increase AR transcriptional activity (PubMed:25091737). {ECO:0000269|PubMed:28076346, ECO:0000269|PubMed:28502770, ECO:0000305|PubMed:25091737}. This is the function of BUD31 (BUD31 spliceosome associated protein, ENSG00000106245).