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Component of the U4/U6-U5 tri-snRNP complex, a building block of the precatalytic spliceosome (spliceosome B complex) (By similarity). The U4/U6-U5 tri-snRNP complex is composed of the U4, U6 and U5 snRNAs and at least PRPF3, PRPF4, PRPF6, PRPF8, PRPF31, SNRNP200, TXNL4A, SNRNP40, SNRPB, SNRPD1, SNRPD2, SNRPD3, SNRPE, SNRPF, SNRPG, DDX23, CD2BP2, PPIH, SNU13, EFTUD2, SART1 and USP39, plus LSM2, LSM3, LSM4, LSM5, LSM6, LSM7 and LSM8 (By similarity). Interacts directly with PRPF4 (By similarity). Part of a heteromeric complex containing PPIH, PRPF3 and PRPF4 that is stable in the absence of RNA (By similarity). Interacts with SART3; the interaction is direct and recruits the deubiquitinase USP4 to PRPF3 (By similarity). Interacts with PRPF19 (By similarity). Interacts ('Lys-63'-linked polyubiquitinated) with PRPF8 (via the MPN (JAB/Mov34) domain); may stabilize the U4/U6-U5 tri-snRNP complex (By similarity). 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