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Updated: May 14, 2026
08:53
A Reporter Based Cellular Assay for Monitoring Splicing Efficiency
Published on: September 15, 2021
Rearrangements within human spliceosomes captured after exon ligation
Janine O Ilagan1, Robert J Chalkley, A L Burlingame
1Department of Molecular Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, California 95064, USA.
RNA (New York, N.Y.)
|January 25, 2013
Summary
Researchers stalled human spliceosomes after the second chemical step, revealing new RNA-protein interactions critical for mRNA release. This study provides insights into spliceosome dynamics and the mechanisms of RNA splicing.
Area of Science:
- Molecular Biology
- RNA Biology
- Biochemistry
Background:
- Spliceosomes orchestrate pre-mRNA splicing through dynamic RNA/RNA and RNA/protein interactions.
- Characterizing spliceosome intermediates has been challenging due to difficulties in arresting the complex at defined states.
Purpose of the Study:
- To stall human spliceosomes in a post-catalytic state (P complex) to study RNA-protein interactions after the second chemical step of splicing.
- To compare the P complex with the C complex (post-first-step) to identify differences in RNA substrate interactions and protein composition.
Main Methods:
- Utilized shortened 3' exons in human splicing extracts to block mRNA release and stall spliceosomes in the P complex.
- Employed selective reaction monitoring (SRM) mass spectrometry to quantitatively compare protein composition between P and C complexes.
- Used electron microscopy to analyze the structural features of the stalled spliceosome complexes.
Main Results:
- Shortening the 3' exon successfully stalled human spliceosomes in a novel P complex.
- Identified specific differences in RNA substrate protection and protein crosslinking near splice sites between P and C complexes.
- Observed enrichment of SF3b components and depletion of DHX35 in the P complex compared to the C complex.
Conclusions:
- The ability to isolate and compare human spliceosomes before and after second-step chemistry provides new insights into spliceosome rearrangements.
- These findings illuminate the roles of specific RNA-protein interactions in exon ligation and mRNA release during splicing.
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