Macromolecular structures probed by combining single-shot free-electron laser diffraction with synchrotron coherent...

Area of Science:

• Biophysics
• Nanotechnology
• Structural Biology

Background:

• Biological macromolecular complexes self-assemble into nanostructures with potential applications in sensing and drug delivery.
• Advanced structural characterization tools are crucial for understanding these complex nanomaterials.
• Femtosecond X-ray pulses from X-ray free-electron lasers (XFELs) offer instantaneous imaging of nanostructures at ambient temperatures.

Purpose of the Study:

• To develop and demonstrate a novel multimodal X-ray analysis technique for ab initio structural investigation of biological nanostructures.
• To gain insights into the nanostructure formation of RNA interference microsponges.

Main Methods:

• Combined femtosecond X-ray single-shot diffraction using an X-ray free-electron laser (XFEL).
• Utilized coherent diffraction imaging with synchrotron X-rays for observing steady-state features.
• Applied multimodal coherent X-ray analysis to biological macromolecular complexes.

Main Results:

• Successfully demonstrated the combined use of XFEL single-shot diffraction and synchrotron-based coherent diffraction imaging.
• Provided detailed insights into the nanostructure formation of RNA interference microsponges.
• Validated the multimodal approach for ab initio structural determination.

Conclusions:

• The newly introduced multimodal analysis with coherent X-rays is effective for unveiling nano-scale structural motifs.
• This technique can be applied to functional nanomaterials and biological nanocomplexes without requiring a priori knowledge.
• Enables comprehensive structural characterization of complex biological nanostructures.