U2-type precatalytic spliceosome

id: GO:0071005
name: U2-type precatalytic spliceosome
namespace: cellular_component
type: go
obsolete: False

Description: A spliceosomal complex that is formed by the recruitment of the preassembled U4/U6.U5 tri-snRNP to the 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 U1, U2 and U4/U6.U5 snRNPs.

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