Involved in pre-mRNA splicing as component of the spliceosome. Associated with sn-RNP U2, where it contributes to the binding of stem loop IV of U2 snRNA. Identified in the spliceosome B complex. Identified in the spliceosome C complex. Present in a spliceosome complex assembled in vitro, and composed of SNRPB2, HPRP8BP and CRNKL1. Contributes to the binding of stem loop IV of U2 snRNA with SNRPP1. Belongs to the RRM U1 A/B'' family.