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Elemental activities, such as catalysis or binding, describing the actions of a gene product at the molecular level. A given gene product may exhibit one or more molecular functions. 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. Catalysis of a biochemical reaction at physiological temperatures. In biologically catalyzed reactions, the reactants are known as substrates, and the catalysts are naturally occurring macromolecular substances known as enzymes. Enzymes possess specific binding sites for substrates, and are usually composed wholly or largely of protein, but RNA that has catalytic activity (ribozyme) is often also regarded as enzymatic.

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: first spliceosomal transesterification activity
Acc: GO:0000384
Aspect: Molecular Function
Desc: 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.
Synonyms:
  • lariat formation, 5'-splice site cleavage
Proteins in PDR annotated with:
   This term: 9 [Search]
   Term or descendants: 9 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0000384 - first spliceosomal transesterification activity (interactive image map)
YRC Informatics Platform - Version 3.0
Created and Maintained by: Michael Riffle