Required for pre-mRNA splicing as component of the spliceosome (PubMed:28502770, PubMed:30705154). Binds double-stranded RNA. Inhibits EIF2AK2 kinase activity (By similarity). Component of the pre-catalytic and post-catalytic spliceosome complexes (PubMed:28502770, PubMed:30705154). Interacts with EIF2AK2 (By similarity). Belongs to the PRKRIP1 family.