U2-type catalytic step 1 spliceosome
A spliceosomal complex that is formed by the displacement of the U1 and U4 snRNPs from the precatalytic spliceosome; the U2, U5 and U6 snRNPs remain associated with the mRNA. This complex, sometimes called the activated spliceosome, is the catalytically active form of the spliceosome, and includes many proteins in addition to those found in the U2, and U5 and U6 snRNPs.
GO:0005684
U2-type spliceosomal complex
is_a
GO:0071012
catalytic step 1 spliceosome
is_a
GT-AG catalytic step 1 spliceosome
narrow
U2-type activated spliceosome
exact
major catalytic step 1 spliceosome
exact
mammalian U2-type spliceosomal complex B*
narrow
mammalian U2-type spliceosomal complex B2
narrow
yeast U2-type spliceosomal complex A1
narrow
SPAC3A12.11c SPBC19C2.01 SPCC550.02c SPAC9.13c SPAC29A4.08c