name: U12-type precatalytic spliceosome
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def: "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." [GOC:ab, GOC:krc, GOC:mah, PMID:16201866]
synonym: "AT-AC precatalytic spliceosome" NARROW [GOC:krc, GOC:mah]
synonym: "mammalian U12-type spliceosomal complex B" NARROW [GOC:ab, GOC:krc, GOC:mah, ISBN:0879695897, ISBN:0879697393, PMID:19239890]
synonym: "mammalian U12-type spliceosomal complex B1" NARROW [GOC:krc, GOC:mah, ISBN:0879695897, ISBN:0879697393]
synonym: "minor precatalytic spliceosome" EXACT [GOC:krc, GOC:mah]
synonym: "yeast U12-type spliceosomal complex A2-1" NARROW [GOC:krc, GOC:mah, ISBN:0879695897, ISBN:0879697393]
is_a: GO:0005689 ! U12-type spliceosomal complex
is_a: GO:0071011 ! precatalytic spliceosome
relationship: has_part: GO:0005692 ! U11 snRNP
relationship: has_part: GO:0005693 ! U12 snRNP
relationship: has_part: GO:0071009 ! U4atac/U6atac x U5 tri-snRNP complex
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