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Solution structure determination and biophysical characterization studies of 7SK RNP and 7SL SRP RNAs
Michael H D'Souza1, Higor Sette Pereira1, Scott Tersteeg1
1Department of Chemistry and Biochemistry, Alberta RNA Research and Training Institute, University of Lethbridge, Lethbridge, Alberta, Canada T1K 3M4.
RNA (New York, N.Y.)
|July 31, 2025
Summary
This study reveals the complete 3D structures of 7SK and 7SL RNAs, crucial for gene transcription and protein translation, using advanced modeling and scattering techniques.
Area of Science:
- Molecular Biology
- Structural Biology
- Biophysics
Background:
- Small noncoding RNAs like 7SK snRNA and 7SL RNA are vital for regulating gene transcription and protein translation.
- These RNAs possess critical secondary structures for protein interactions, but their full 3D structures remain unresolved.
- Previous characterization of RNA-protein interactions relied on methods like chemical probing, Cryo-EM, and NMR.
Purpose of the Study:
- To determine the complete three-dimensional structures of full-length 7SK and 7SL RNAs.
- To bridge the knowledge gap regarding the tertiary structures and mechanisms of these essential RNAs.
- To generate atomistic models of 7SK and 7SL RNAs based on experimental data.
Main Methods:
- Small-Angle X-ray Scattering (SAXS) for structural analysis.
- Coarse-grained computational modeling (SimRNA) of secondary structures.
- Size exclusion chromatography with light scattering and Circular Dichroism Spectroscopy for solution-based verification.
- All-atom, structure-based potential simulations for model optimization.
Main Results:
- Generation of full-sequence, three-dimensional atomistic models for 7SK and 7SL RNAs.
- Verification of RNA size and secondary structures in solution using SEC-LS and CD Spectroscopy.
- 7SK RNA exhibits a versatile morphology with interacting stem-loops in 3D space.
- 7SL RNA presents as a rigid, tightly wound structure with base-pairing in the Alu domain, potentially scaffolding signal recognition particle formation.
Conclusions:
- The study provides unprecedented 3D structural insights into 7SK and 7SL RNAs.
- These findings enhance our understanding of transcription and translation regulation by small noncoding RNAs.
- The determined structures offer a basis for further investigation into RNA-protein interactions and molecular mechanisms.
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