Term Name:	generation of catalytic spliceosome for second transesterification step
Synonyms:	catalytic spliceosome assembly for second transesterification step, formation of catalytic spliceosome for second transesterification step, formation of catalytic U12-type spliceosome for second transesterification step, formation of catalytic U2-type spliceosome for second transesterification step, formation of spliceosomal A2-2 complex, formation of spliceosomal C1 complex, lariat formation, 5'-splice site cleavage, spliceosomal A2-3 complex biosynthesis, spliceosomal A2-3 complex formation, spliceosomal C2 complex biosynthesis, spliceosomal C2 complex formation
Definition:	Conformational rearrangement of the spliceosomal complex containing the RNA products from the 1st step of splicing to form the catalytic site for the second step of splicing.
Ontology:	GO: Biological Process [GO:0000350]    QuickGO    AmiGO