Necessary for the splicing of pre-mRNA. It is required for formation of the earliest ATP-dependent splicing complex and interacts with spliceosomal components bound to both the 5'- and 3'-splice sites during spliceosome assembly. It also is required for ATP-dependent interactions of both U1 and U2 snRNPs with pre-mRNA.
Specificity
Natural and recombinant Rat Serine/arginine-rich splicing factor 2
In vitro, salf-associates and binds SRSF1/SFRS1 (ASF/SF2), SNRNP70 and U2AF1 but not U2AF2. Binds SREK1/SFRS12. Interacts with CCNL2. Interacts with SCAF11. Interacts with ZRSR2/U2AF1-RS2. Interacts with CCDC55 (via C-terminus) (By similarity). Interacts with CCNL1.