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Utilization of Grafix for the Detection of Transient Interactors of Saccharomyces cerevisiae Spliceosome Subcomplexes
Published on: November 9, 2020
Cross-intron bridging interactions in the yeast commitment complex are conserved in mammals
1Howard Hughes Medical Institute, Department of Biology, Brandeis University, Waltham, Massachusetts 02254, USA.
Cell
|May 2, 1997
Summary
Researchers identified Msl5p (now BBP) as a novel yeast splicing factor that bridges intron ends. This protein and its mammalian ortholog SF1 interact with other splicing factors, revealing conserved cross-intron interactions.
Area of Science:
- Molecular Biology
- RNA Splicing
- Protein-Protein Interactions
Background:
- The yeast (S. cerevisiae) splicing pathway initiates with the commitment complex.
- The commitment complex includes U1 snRNP and Mud2p, a homolog of human U2AF65.
Purpose of the Study:
- To identify novel components of the yeast commitment complex.
- To investigate the role of Msl5p in RNA splicing and its evolutionary conservation.
Main Methods:
- Genetic screening to identify novel yeast splicing factors.
- Biochemical assays to confirm protein-protein interactions.
- Comparative analysis of yeast and mammalian splicing factors.
Main Results:
- Identification of MSL-5 (Msl5p) as a novel commitment complex component.
- Demonstration of direct interactions between Msl5p, Mud2p, and Prp40p, forming a cross-intron bridge.
- Msl5p (renamed BBP) is evolutionarily conserved, with mammalian ortholog SF1 interacting with U2AF65 and functioning in the E complex.
Conclusions:
- Msl5p/BBP and its mammalian ortholog SF1 are crucial for bridging intron ends during splicing.
- These findings reveal conserved cross-intron protein-protein interactions between yeast and mammals.
- The study expands our understanding of the early steps in the spliceosome assembly pathway.
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