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Updated: Sep 11, 2025
08:53
A Reporter Based Cellular Assay for Monitoring Splicing Efficiency
Published on: September 15, 2021
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A common structural mechanism for RNA recognition by the SF3B complex in mRNA splicing and export.
Yuzhu Zhang1,2, Changping Yin3, Yimin Wang3
1Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China.
Nucleic Acids Research
|August 12, 2025
Summary
The SF3B complex recognizes RNA by shape, not sequence, explaining its diverse roles. Cancer-associated SF3B1 mutations impair RNA binding, affecting splicing and export.
Area of Science:
- Molecular Biology
- Structural Biology
- Genetics
Background:
- The SF3B complex is crucial for pre-mRNA splicing and mRNA nuclear export.
- SF3B1, its largest subunit, is frequently mutated in cancers, causing splicing defects.
Purpose of the Study:
- To elucidate the RNA recognition mechanism of the SF3B complex.
- To understand how SF3B1 mutations impact RNA binding and cellular functions.
Main Methods:
- Cryo-electron microscopy (cryo-EM) to determine structures of the SF3B complex with RNA.
- Molecular dynamics analyses to study mutant SF3B1 complexes.
Main Results:
- SF3B complex binds diverse RNA targets, including histone mRNAs and U2 snRNA, through a conserved bulged adenosine conformation.
- Cancer-associated SF3B1 mutations (SF3B1K700E, SF3B1R625H) reduce RNA binding affinity by repelling the polypyrimidine tract.
Conclusions:
- SF3B complex recognizes RNA based on its specific 3D shape, not sequence.
- SF3B1 mutations can disrupt multiple cellular processes, including pre-mRNA splicing and mRNA export, contributing to cancer pathogenesis.
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