first spliceosomal transesterification activity

Term ID

GO:0000384

Synonyms

• lariat formation, 5'-splice site cleavage

Definition

Catalysis 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. (2)

References

Ontology

GO: Molecular Function    QuickGO    AmiGO