U12-type precatalytic spliceosome
A spliceosomal complex that is formed by the recruitment of the preassembled U4atac/U6atac.U5 tri-snRNP to the U12-type prespliceosome. Although all 5 snRNPs are present, the precatalytic spliceosome is catalytically inactive. The precatalytic spliceosome includes many proteins in addition to those found in the U11, U12 and U4atac/U6atac.U5 snRNPs.
GO:0005689
U12-type spliceosomal complex
is_a
GO:0071011
precatalytic spliceosome
is_a
AT-AC precatalytic spliceosome
narrow
mammalian U12-type spliceosomal complex B
narrow
mammalian U12-type spliceosomal complex B1
narrow
minor precatalytic spliceosome
exact
yeast U12-type spliceosomal complex A2-1
narrow