DNA- and RNA-binding protein, involved in several nuclear processes such as pre-mRNA splicing, apoptosis and transcription regulation. In association with FUBP1 regulates MYC transcription at the P2 promoter through the core-TFIIH basal transcription factor. Acts as a transcriptional repressor through the core-TFIIH basal transcription factor. Represses FUBP1-induced transcriptional activation but not basal transcription. Decreases ERCC3 helicase activity. Is also involved in pre-mRNA splicing. Promotes splicing of an intron with weak 3'-splice site and pyrimidine tract in a cooperative manner with U2AF2. Involved in apoptosis induction when overexpressed in HeLa cells. Modulates alternative splicing of several mRNAs. Binds to relaxed DNA of active promoter regions. Binds to the pyrimidine tract and 3'-splice site regions of pre-mRNA; binding is enhanced in presence of U2AF2. Binds to Y5 RNA in association with RO60. Binds to poly(U) RNA (By similarity). Homodimer (By similarity). Associates with the spliceosome (By similarity). Found in a complex with RO60 and Y5 RNA (By similarity). Found in a complex with FUBP1 and far upstream element (FUSE) DNA segment (By similarity). Interacts directly with ERCC3 (By similarity). Interacts with CDK7 and GTF2H1 (By similarity). Interacts with SRSF11/P54 (By similarity). Colocalizes partially with RO60. The third RNA recognition motif, called PUMP domain, is atypical and may rather mediate homodimerization and/or protein-protein interactions. Belongs to the RRM half pint family.