Involved in histone pre-mRNA 3' processing (PubMed:11782412). Required for chromosome condensation, progression of cell death and morphogenesis (PubMed:11782412). Ubiquitinated by the CBC(fem-1) (Cul2-ElonginB-ElonginC) E3 ubiquitin-protein ligase complex, leading to its degradation. Belongs to the SLBP family.