Fluorescently tagged antibiotics are powerful tools that can be used to study multiple aspects of antimicrobial resistance. This article describes the preparation of fluorescently tagged antibiotics and their application to studying antibiotic resistance in bacteria. Probes can be used to study mechanisms of bacterial resistance (e.g., efflux) by spectrophotometry, flow cytometry, and microscopy.
Total time
~3-5 days (synthesis + bacterial culture + analysis)
Steps
1
Understand fluorescent antibiotic probe applications
Review the rationale for using fluorescently tagged antibiotics to study antimicrobial resistance mechanisms, including efflux pump activity and bacterial uptake kinetics.
▶ 00:05
2
Synthesize fluorescently labeled antibiotic probes
Prepare fluorescently tagged antibiotic molecules through chemical conjugation of fluorophores to antibiotic scaffolds, ensuring retained antimicrobial properties.
▶ 00:33
3
Evaluate antimicrobial activity of conjugates
Assess the biological activity of fluorescent antibiotic probes against bacterial strains using standard antimicrobial susceptibility assays.
▶ 02:16
4
Analyze probe accumulation in bacterial cells
Measure intracellular fluorescent antibiotic accumulation using flow cytometry and fluorescence microscopy to detect resistance-associated efflux mechanisms.
▶ 04:19
5
Interpret representative resistance visualization results
Review representative data demonstrating differential probe accumulation patterns in susceptible versus resistant bacterial populations.
▶ 07:00