FB2026_03 , released September 17, 2026
CV Term Report
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Term U2-type precatalytic spliceosome ID (Ontology) GO:0071005 (Gene Ontology)
Definition 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.[ PubMed:18322460 PubMed:19239890 ]
Also Known As"major precatalytic spliceosome"
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 U2-type precatalytic spliceosome (all annotations which use CV term, excluding "NOT" statements)
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spliceosomal complex
 |__U2-type spliceosomal complex__
 |__precatalytic spliceosome______|
                                  U2-type precatalytic spliceosome  1 rec.
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Is a U2-type spliceosomal complex
precatalytic spliceosome
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Synonyms
  • "GT-AG precatalytic spliceosome" NARROW
    "major precatalytic spliceosome" EXACT
    "mammalian U2-type spliceosomal complex B" NARROW[ ISBN:0879695897 ISBN:0879697393 PubMed:19239890 ]
    "mammalian U2-type spliceosomal complex B1" NARROW[ ISBN:0879695897 ISBN:0879697393 ]
    "yeast U12-type spliceosomal complex A2-1" RELATED[ ISBN:0879695897 ISBN:0879697393 ]
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