Involved in pre-mRNA splicing process. Identified in the spliceosome C complex. Present in a spliceosome complex assembled in vitro containing CRNKL1, HPRP8BP and SNRPB2. Interacts with PPIL2 (via the PPIase cyclophilin-type domain); they may form a trimeric complex with HSP90. Colocalizes with core spliceosomal snRNP proteins. Highly expressed in embryonic brain but its expression decrease during development. Belongs to the crooked-neck family.