Ribosomal RNA processing protein 1 homolog B (RRP1B)

Positively regulates DNA damage-induced apoptosis by acting as a transcriptional coactivator of proapoptotic target genes of the transcriptional activator E2F1 (PubMed:20040599). Likely to play a role in ribosome biogenesis by targeting serine/threonine protein phosphatase PP1 to the nucleolus (PubMed:20926688).

Involved in regulation of mRNA splicing (By similarity). Inhibits SIPA1 GTPase activity (By similarity).