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A Microfluidic Chip for the Versatile Chemical Analysis of Single Cells
Published on: October 15, 2013
Development of microfluidic chips for heterogeneous receptor-ligand interaction studies
Mark D Goldberg1, Roger C Lo, Silvija Abele
1Department of Chemistry and Biochemistry, California State University, Los Angeles, 5151 State University Drive, Los Angeles, California 90032-8202, USA.
Analytical Chemistry
|May 16, 2009
Summary
A novel microfluidic method quantifies binding affinity for glycopeptide antibiotics like teicoplanin and vancomycin. This technique uses surface modification and fluorescence detection to determine antibiotic-peptide interactions efficiently.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Microfluidics
Background:
- Glycopeptide antibiotics, including teicoplanin and vancomycin, are crucial in treating bacterial infections.
- Quantifying their binding affinity to target peptides is essential for understanding efficacy and developing new drugs.
- Traditional methods for measuring binding affinity can be complex and time-consuming.
Purpose of the Study:
- To develop a simple and efficient microfluidic-based technique for quantifying the binding affinity of glycopeptide antibiotics.
- To determine the binding constants for teicoplanin and vancomycin with a fluorescently labeled peptide.
Main Methods:
- Microchannels were surface-modified using (3-aminopropyl)triethoxysilane.
- Antibiotics were immobilized via electrostatic interactions.
- Binding affinity was measured by quantifying fluorescence of 5-carboxyfluorescein-D-Ala-D-Ala-D-Ala (5-FAM-(DA)3) binding to immobilized antibiotics.
- Fluorescence was detected using a microscope with a CCD camera.
Main Results:
- The binding constants for teicoplanin and vancomycin with 5-FAM-(DA)3 were determined to be 6.03 ± 0.97 x 10^4 M^-1 and 4.93 ± 1.13 x 10^4 M^-1, respectively.
- These values are in good agreement with previously reported data.
- The microfluidic technique demonstrated ease of quantification.
Conclusions:
- A simple microfluidic method effectively quantifies glycopeptide antibiotic binding affinity.
- This technique offers a powerful tool for studying various receptor-ligand interactions.
- The method's simplicity and efficiency facilitate broader application in drug discovery and development.
