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GO_term: GO:0000384   

GO:0000384DefinitionCatalysis of the first transesterification reaction of spliceosomal mRNA splicing. The intron branch site adenosine is the nucleophile attacking the 5' splice site, resulting in cleavage at this position. In cis splicing, this is the step that forms a lariat structure of the intron RNA, while it is still joined to the 3' exon.
Term 1st spliceosomal transesterification activity
first spliceosomal transesterification activity
TypeMolecular_function
Child Instance GO:0000362
GO:0000363
ParentInstance_ofGO:0000385
Attributes_of Index (2)