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Improved Imaging Surface for Quantitative Single-Molecule Microscopy.

Yu P Zhang1,2, Evgeniia Lobanova1,2, Asher Dworkin1,2

  • 1Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.

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|July 9, 2024
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Summary
This summary is machine-generated.

A novel RainX-F127 (RF-127) surface significantly reduces nonspecific binding in single-molecule microscopy. This improved passivation enables sensitive detection of protein aggregates in various biofluids.

Keywords:
imaging surfaceprotein aggregatessingle-molecule microscopysuper-resolution microscopysurface chemistrysurface passivation

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Area of Science:

  • Biophysics
  • Materials Science
  • Biochemistry

Background:

  • Nonspecific binding hinders sensitive detection in surface-based single-molecule microscopy.
  • Existing passivation methods, like polyethylene glycol (PEG) surfaces, have limitations in preventing aggregate binding.

Purpose of the Study:

  • To develop a simplified surface with enhanced passivation for quantitative single-molecule microscopy.
  • To reduce nonspecific binding of protein aggregates compared to conventional surfaces.

Main Methods:

  • Fabrication of a simplified RainX-F127 (RF-127) surface.
  • Evaluation of RF-127 surface passivation against protein aggregates.
  • Testing compatibility with single-molecule techniques like SiMPull and super-resolution imaging.
  • Detection of alpha-synuclein (α-syn) and tau aggregates in diverse biofluids.

Main Results:

  • The RF-127 surface demonstrated up to 100-fold less nonspecific binding compared to PEG surfaces.
  • The surface enabled specific detection of α-syn and tau aggregates in serum, brain extracts, CSF, and saliva.
  • The method proved compatible with various single-molecule assays and allowed for microplate functionalization.

Conclusions:

  • The simplified RF-127 surface offers a robust and versatile platform for quantitative single-molecule microscopy.
  • This improved surface enhances sensitivity and specificity in detecting protein aggregates across multiple biofluid types.
  • The method is accessible, requiring no specialized equipment, and facilitates high-throughput applications.