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High-Speed Super-Resolution Imaging Using Protein-Assisted DNA-PAINT.

Mike Filius1, Tao Ju Cui1, Adithya N Ananth1,2

  • 1Department of BioNanoScience, Kavli Institute of Nanoscience, Delft University of Technology, van der Maasweg 9, 2629 HZ Delft, The Netherlands.

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|March 14, 2020
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Summary

Researchers developed Ago-assisted DNA-PAINT (Ago-PAINT) to accelerate super-resolution imaging. This novel method uses the Argonaute protein to increase DNA imager strand binding speed by tenfold, enhancing imaging efficiency.

Keywords:
Ago-PAINTArgonauteDNA origamiDNA-PAINTsingle-molecule FRETsuper-resolution microscopy

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Nanotechnology

Background:

  • Super-resolution imaging enables nanoscale visualization of cellular structures.
  • DNA-PAINT (DNA point accumulation in nanoscale topology) is a key super-resolution technique relying on DNA imager strand dynamics.
  • Current DNA-PAINT methods face limitations due to slow imager strand binding rates, impacting acquisition speed.

Purpose of the Study:

  • To develop a faster DNA-PAINT method for improved super-resolution imaging.
  • To investigate the use of Argonaute protein for enhancing DNA imager strand binding kinetics.
  • To quantify the speed enhancement and resolution preservation of the new method.

Main Methods:

  • Incorporation of DNA imager strands into the Argonaute (Ago) protein.
  • Utilizing Ago's ability to pre-order imager strands into a helical conformation.
  • Testing Ago-assisted DNA-PAINT (Ago-PAINT) on a 2D DNA origami structure for validation.

Main Results:

  • Ago pre-organization of imager strands resulted in a tenfold increase in target binding speed.
  • Ago-PAINT demonstrated a significant acceleration of the DNA-PAINT technique.
  • High spatial resolution comparable to conventional DNA-PAINT was maintained.

Conclusions:

  • Ago-assisted DNA-PAINT (Ago-PAINT) offers a substantial speed improvement for super-resolution microscopy.
  • This method maintains the high resolution characteristic of DNA-PAINT.
  • Ago-PAINT is a promising tool for accelerating super-resolution imaging and other nucleic acid-based techniques.