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Allosteric cascade of spliceosome activation.
1Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706-1532, USA. dabrow@facstaff.wisc.edu
Annual Review of Genetics
|November 14, 2002
Summary
The spliceosome, a complex of RNA and proteins, precisely removes introns from precursor messenger RNAs. This review details the dynamic, allosteric cascade driving splicing accuracy from initial recognition to catalysis.
Area of Science:
- Molecular Biology
- RNA Biology
- Biochemistry
Background:
- Precursor messenger RNAs undergo splicing, a critical process for gene expression, occurring in the cell nucleus.
- The spliceosome, a large ribonucleoprotein complex, mediates intron removal.
- The spliceosome comprises five snRNPs (small nuclear ribonucleoproteins), each containing RNA and proteins, which dynamically interact during splicing.
Purpose of the Study:
- To review the progression of the spliceosome's allosteric cascade.
- To elucidate the mechanism from the initial intron recognition event to the first catalytic step of splicing.
Main Methods:
- This study is a review, synthesizing existing research on spliceosome dynamics.
- Focuses on the ordered progression of snRNP interactions and their dependence on RNA recognition.
Main Results:
- Spliceosome assembly and function involve a dynamic, allosteric cascade of interactions.
- This cascade is driven by RNA-dependent ATPases (DExD/H-box family).
- Multiple intron-recognition events ensure the accuracy of the splicing process.
Conclusions:
- The allosteric cascade is programmed into the spliceosome's RNA and protein components.
- Progression through the cascade, driven by ATPases, ensures accurate intron removal.
- Understanding this cascade is key to comprehending the fidelity of gene expression.