Probably involved in intron recognition and spliceosome assembly, but not involved in alternative splicing regulation of the SCL33 intron. Component of the spliceosome. Interacts with SNRNP35, CYP59 and RS2Z33. No effect on SCL33 alternative splicing. The splicing pattern of the pre-mRNA is regulated in a tissue-specific manner and by development, and changes in response to various types of abiotic stresses. Belongs to the splicing factor SR family. SC subfamily.