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José Ignacio Gallea1, Oleksii Nevskyi1, Zuzanna Kaźmierczak2,3

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Summary

Bacteriophage T4 serves as a novel bio-ruler for 3D super-resolution microscopy. This virus enables precise nanoscale measurements, advancing 3D imaging of subcellular structures.

Keywords:
DNA‐PAINTbacteriophagesnanorulerssuper‐resolution fluorescence microscopyvirus structure

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Area of Science:

  • Biophysics
  • Microscopy
  • Structural Biology

Background:

  • Super-resolution fluorescence microscopy is advancing into 3D, requiring reliable biological standards for validation.
  • Existing standards lack precise geometry and specific labeling for 3D nanoscale imaging.
  • Bacteriophage T4 offers a biologically compatible, well-defined structure for super-resolution calibration.

Purpose of the Study:

  • To introduce bacteriophage T4 as a versatile bio-ruler for 3D super-resolution imaging.
  • To demonstrate the capability of bacteriophage T4 for validating 3D imaging resolution.
  • To provide a simple protocol for preparing bacteriophage T4 samples.

Main Methods:

  • Utilized DNA point accumulation for imaging in nanoscale topography (DNA-PAINT).
  • Employed astigmatic imaging techniques for 3D reconstruction.
  • Developed a straightforward protocol for bacteriophage T4 sample preparation.

Main Results:

  • Successfully visualized the 120 nm T4 bacteriophage capsid and hollow tail in 3D.
  • Achieved unprecedented detail in light microscopy imaging of bacteriophage T4.
  • Demonstrated bacteriophage T4's suitability as a nanoscale 3D measurement tool.

Conclusions:

  • Bacteriophage T4 is an effective and accessible bio-ruler for 3D super-resolution microscopy.
  • This virus provides a novel benchmark for assessing and improving 3D imaging capabilities.
  • The study facilitates advancements in visualizing complex 3D biological structures.