RNA structures and dynamics with Å resolution revealed by x-ray free electron lasers

Area of Science:

• Structural biology
• Biophysics
• Molecular biology

Background:

• RNA molecules fold into complex structures crucial for their biological functions.
• Determining RNA structures is challenging due to their high charge and dynamic nature.

Approach:

• Utilized the high brilliance of X-ray free electron laser (XFEL) sources for structural analysis.
• Employed wide-angle solution scattering experiments to identify structural signatures.
• Achieved millisecond time resolution to observe dynamic folding processes.

Key Points:

• Identified Å-scale features in both structured and unstructured RNAs.
• Observed the real-time folding of RNA from a single strand to a triple helix conformation.
• Demonstrated that RNA backbone dynamics orchestrate folding, with base stacking finalizing the structure.

Conclusions:

• The study provides new insights into RNA triple helix formation and their function as signaling elements.
• This novel method significantly accelerates the structure determination of essential, yet undercharacterized, RNA macromolecules.