Involved in the pre-mRNA splicing process (PubMed:28502770, PubMed:28076346). May play a role as regulator of AR transcriptional activity; may increase AR transcriptional activity (PubMed:25091737). Identified in the spliceosome C complex (PubMed:28502770, PubMed:28076346). May interact with AR (PubMed:25091737). Detected in chromatin at the promoter of AR target genes. Detected in epithelial and stromal cells in benign prostate hyperplasia tissue (at protein level). 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.