Involved in the pre-mRNA splicing process. May play a role as regulator of AR transcriptional activity; may increase AR transcriptional activity. Identified in the spliceosome C complex. May interact with AR. Detected in chromatin at the promoter of AR target genes. Contains a short sequence motif (Phe-Xaa-Xaa-Phe-Tyr) that can bind to AR and may modulate AR activity. Belongs to the BUD31 (G10) family.