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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...

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Monitoring Protein Adsorption with Solid-state Nanopores
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Exploring a solid-state nanopore approach for single-molecule protein detection from single cells.

Zi-Qi Zhou1, Shao-Chuang Liu1, Jia Wang1

  • 1Molecular Sensing and Imaging Center, School of Chemistry and Chemical Engineering, Nanjing University Nanjing 210023 P. R. China yitaolong@nju.edu.cn shaochuangliu@nju.edu.cn.

Chemical Science
|April 16, 2025
PubMed
Summary
This summary is machine-generated.

Solid-state nanopores enable direct single-molecule protein analysis from single cells. This method reveals distinct protein behaviors in cellular environments compared to purified samples, advancing cellular research.

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Area of Science:

  • Biophysics
  • Analytical Chemistry
  • Molecular Biology

Background:

  • Direct protein analysis in complex cellular samples is vital for understanding cellular diversity and disease.
  • Current methods often struggle with the complexity and heterogeneity of cellular environments.
  • Single-molecule analysis offers higher sensitivity and resolution for protein studies.

Purpose of the Study:

  • To explore the potential of silicon nitride (SiN) solid-state nanopores for single-molecule protein analysis directly from complex cellular samples.
  • To develop and validate a method for enhanced protein capture and analysis within nanopores.
  • To investigate differences between proteins analyzed directly from single cells versus purified samples.

Main Methods:

  • Engineered a nanopore electrophoretic driver protein fused with the model protein LOV2 to improve capture efficiency.
  • Utilized glass nanopipette-based single-cell extraction to isolate cellular contents.
  • Performed ex situ single-cell protein analysis using SiN solid-state nanopores to identify and monitor protein conformational changes.

Main Results:

  • Successfully identified and monitored conformational changes of the LOV2 protein from single-cell extracts using SiN nanopores.
  • Demonstrated enhanced capture efficiency of the target protein through the engineered driver protein.
  • Observed significant differences in protein characteristics when analyzed directly from single cells compared to purified protein samples.

Conclusions:

  • Solid-state nanopores are a powerful tool for single-cell, single-molecule protein analysis.
  • This technique provides insights into protein dynamics and interactions within their native cellular context.
  • The findings open new avenues for studying cellular heterogeneity and disease mechanisms at the molecular level.