has part Prp19 complex spliceosomal complex U5 snRNP catalytic step 2 spliceosome GO:0071013 mah mammalian spliceosomal complex C1 mammalian spliceosomal complex C 2009-07-30T12:00:35Z A spliceosomal complex that contains three snRNPs, including U5, bound to a splicing intermediate in which the first catalytic cleavage of the 5' splice site has occurred. The precise subunit composition differs significantly from that of the catalytic step 1, or activated, spliceosome, and includes many proteins in addition to those found in the associated snRNPs. cellular_component yeast spliceosomal complex A2-2 catalytic complex