Accelerated cryo-EM-guided determination of three-dimensional RNA-only structures

Area of Science:

• Structural biology
• Biochemistry
• Computational biology

Background:

• RNA structural characterization lags behind discovery and design.
• Accurate 3D structures are crucial for understanding RNA function.

Purpose of the Study:

• To present a novel pipeline, Ribosolve, for rapid RNA structure determination.
• To demonstrate the pipeline's capability in characterizing diverse RNA molecules.

Main Methods:

• Integration of cryo-electron microscopy (cryo-EM) with multidimensional chemical mapping.
• Application of Rosetta DRRAFTER computational modeling for coordinate estimation.
• Validation through simulation benchmarks, blind challenges, and mutagenesis studies.

Main Results:

• Ribosolve successfully resolved global architectures of 11 previously unknown protein-free RNA structures.
• The pipeline accurately detected homologies and conformational rearrangements.
• Subnanometer-resolution coordinate estimation was achieved for RNA-only systems.

Conclusions:

• The Ribosolve pipeline offers accelerated throughput for RNA structural studies.
• It accurately determines global RNA architectures but not atomic details.
• Provides guidelines for future RNA structural investigations.