Implementation of a 4Pi-SMS super-resolution microscope

Area of Science:

• Biophysics
• Optical Microscopy
• Cell Biology

Background:

• Single-molecule switching (SMS) fluorescence microscopy, also known as single-molecule localization microscopy, has revolutionized cell biology imaging.
• The 4Pi geometry, utilizing opposing objectives, enhances numerical aperture, enabling higher resolution imaging.

Purpose of the Study:

• To provide a comprehensive protocol for establishing 4Pi-SMS super-resolution microscopy in research laboratories.
• To enable researchers to achieve nanoscale 3D resolution imaging of cellular structures.

Main Methods:

• Detailed instructions for assembling and aligning the optomechanical components of a 4Pi-SMS instrument.
• Guidance on sample preparation (fluorescent beads), instrument operation, and image data analysis for 3D reconstruction.
• Includes a troubleshooting guide and examples of expected results.

Main Results:

• Demonstrates 3D resolution down to 10 nm over entire cellular volumes using 4Pi geometry and interferometric detection.
• Provides a practical framework for researchers to implement advanced super-resolution microscopy techniques.
• Successful acquisition of high-quality biological images after approximately 12 months of instrument construction.

Conclusions:

• The protocol facilitates the adoption of 4Pi-SMS microscopy, advancing the field of super-resolution imaging.
• Enables detailed visualization of cellular structures at the nanoscale, crucial for understanding biological processes.
• Empowers researchers to perform cutting-edge 3D super-resolution microscopy in their own labs.