Cryo-CLXEM introduces cryo-SXT to bridge the resolution gap in cryo-CLEM

Area of Science:

• Cellular Biology
• Structural Biology
• Microscopy

Background:

• Cryo-imaging visualizes cellular interiors under near-native conditions.
• Cryo-correlative light and electron microscopy (cryo-CLEM) combines fluorescence specificity with high-resolution structural detail.
• A resolution gap exists between cryo-visible light fluorescent microscopy (cryo-VLFM) and cryo-electron tomography (cryo-ET), limiting correlative workflows.

Purpose of the Study:

• To introduce cryo-soft X-ray tomography (cryo-SXT) as an intermediate imaging step.
• To compensate for lost cellular material and limited resolution in cryo-CLEM workflows.
• To provide 3D cellular context for cryo-ET datasets.

Main Methods:

• Integration of cryo-soft X-ray tomography (cryo-SXT) into existing cryo-CLEM workflows.
• Utilizing cryo-SXT to bridge the resolution gap between cryo-VLFM and cryo-ET.
• Developing an integrated workflow for correlative X-ray and electron imaging.

Main Results:

• Cryo-SXT provides invaluable 3D cellular context to cryo-ET data.
• The technique compensates for partial views from FIB-milling and limited cryo-VLFM resolution.
• Demonstrated that X-ray and electron imaging are complementary techniques.

Conclusions:

• Cryo-SXT enhances cryo-correlative imaging by providing essential cellular context.
• This integrated workflow improves the analysis of structural biology data.
• Opens new avenues for correlative imaging strategies combining X-ray and electron microscopy.