Related Experiment Video
Updated: May 30, 2025
08:33
Measuring Nucleotide Binding to Intact, Functional Membrane Proteins in Real Time
Published on: March 11, 2021
1.9K
Surface-Sensitive Waveguide Imaging for In Situ Analysis of Membrane Protein Binding Kinetics
Liangju Li1,2, Jingbo Zhang1,3, Caixin Huang1,2
1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Analytical Chemistry
|January 27, 2025
Summary
A new waveguide imaging technique enhances surface plasmon resonance (SPR) for studying membrane protein interactions. This method improves measurement precision for in situ single-cell analysis, aiding drug discovery.
Area of Science:
- Biophysics
- Biochemistry
- Materials Science
Background:
- Membrane protein interactions are crucial for therapeutic processes.
- Surface plasmon resonance (SPR) is a label-free technique for analyzing molecular interactions.
- Traditional SPR faces limitations due to biologically incompatible gold films and fluorescence quenching.
Purpose of the Study:
- To develop a novel sensor technique that overcomes SPR limitations for membrane protein analysis.
- To enhance the precision and applicability of SPR for in situ studies.
- To enable high-precision single-cell analysis of membrane protein binding kinetics.
Main Methods:
- Development of a surface-sensitive waveguide imaging technique integrated into standard SPR devices.
- Deposition of dielectric layers onto SPR sensor chips using vacuum evaporation.
- Incorporation of amplitude modulation to enhance measurement precision.
Main Results:
- The novel sensor provides a biologically compatible silica surface for cell attachment.
- Achieved sharper resonance curves and stronger surface electric fields compared to traditional SPR.
- Increased measurement precision by approximately eight times, enabling in situ single-cell analysis.
- Revealed cell-to-cell heterogeneity relevant to drug resistance.
Conclusions:
- The waveguide imaging technique offers a significant advancement over traditional SPR for membrane protein studies.
- This method enhances SPR capabilities for biochemical research and drug screening.
- The technique facilitates in situ single-cell analysis, providing insights into drug resistance mechanisms.
