Quantification of Single-Molecule Protein Binding Kinetics in Complex Media with Prism-Coupled Plasmonic Scattering Imaging

Pengfei Zhang, Guangzhong Ma, Zijian Wan, Shaopeng Wang

Research output: Contribution to journalArticlepeer-review

Abstract

Measuring molecular binding is critical for understanding molecular-scale biological processes and screening drugs. Label-free detection technologies, such as surface plasmon resonance (SPR), have been developed for analyzing analytes in their natural forms. However, the specificity of these methods is solely relying on surface chemistry and has often nonspecific binding issues when working with samples in complex media. Herein, we show that single-molecule-based measurement can distinct specific and nonspecific binding processes by quantifying the mass and binding dynamics of individual-bound analyte molecules, thus allowing the binding kinetic analysis in complex media such as serum. In addition, this single-molecule imaging is realized in a commonly used Kretschmann prism-coupled SPR system, thus providing a convenient solution to realize high-resolution imaging on widely used prism-coupled SPR systems.

Original languageEnglish (US)
Pages (from-to)1357-1366
Number of pages10
JournalACS sensors
Volume6
Issue number3
DOIs
StatePublished - Mar 26 2021

Keywords

  • binding kinetics
  • molecule interaction
  • plasmonic scattering imaging
  • single proteins
  • surface plasmon resonance

ASJC Scopus subject areas

  • Bioengineering
  • Instrumentation
  • Process Chemistry and Technology
  • Fluid Flow and Transfer Processes

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