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Researchers optimized multi-color super-resolution microscopy by switching imaging buffers. Using Vectashield enhanced fluorescent protein performance without affecting organic fluorophores, enabling detailed 3D imaging of cellular structures like the nucleolus.

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Area of Science:

  • Cellular Biology
  • Microscopy Techniques
  • Biophysics

Background:

  • Multi-color super-resolution localization microscopy is vital for studying intracellular processes like protein-protein interactions.
  • Current methods face challenges combining photoactivatable fluorescent proteins and organic fluorophores due to differing optimal imaging conditions.
  • Developing compatible imaging buffers is crucial for advancing multi-color super-resolution experiments.

Purpose of the Study:

  • To investigate the effect of replacing standard thiol/oxygen scavenging buffers with Vectashield on fluorescent protein and organic fluorophore performance.
  • To enable simultaneous two-color 3D super-resolution imaging of cellular compartments.
  • To optimize protocols for drift and chromatic aberration correction in multi-color super-resolution microscopy.

Main Methods:

  • Comparative analysis of fluorescent protein (mEos2) and organic fluorophore photophysical properties in standard buffer versus Vectashield.
  • Implementation of optimized protocols for sample drift and chromatic aberration correction.
  • Acquisition and analysis of two-color 3D super-resolution images of the nucleolus.

Main Results:

  • Vectashield significantly increased photon emission from mEos2 and enhanced its photoconversion rate.
  • The photophysical properties of organic fluorophores remained unaffected by Vectashield compared to standard buffers.
  • Successful two-color 3D super-resolution imaging of the nucleolus was achieved, resolving its three compartments.

Conclusions:

  • Switching to Vectashield is a viable strategy to enhance fluorescent protein performance in super-resolution microscopy without compromising organic fluorophores.
  • This optimized approach facilitates advanced multi-color 3D super-resolution imaging of subcellular structures.
  • The findings pave the way for more complex co-localization studies in cell biology.