Catalytic component of the Integrator complex, a complex involved in the transcription of small nuclear RNAs (snRNA) and their 3'-box-dependent processing (By similarity). Mediates the snRNAs 3' cleavage (By similarity). Involved in the 3'-end processing of the U7 snRNA, and also the spliceosomal snRNAs U1, U2, U4 and U5 (PubMed:21078872, PubMed:23097424). May mediate recruitment of cytoplasmic dynein to the nuclear envelope, probably as component of the INT complex (By similarity). Belongs to the multiprotein complex Integrator, at least composed of IntS1, IntS2, IntS3, IntS4, omd/IntS5, IntS6, defl/IntS7, IntS8, IntS9, IntS10, IntS11, IntS12, asun/IntS13 and IntS14. Within the complex, interacts with IntS12. The HXHXDH motif is essential for the endoribonuclease activity of the CPSF complex. Belongs to the metallo-beta-lactamase superfamily. RNA-metabolizing metallo-beta-lactamase-like family. INTS11 subfamily.