A sensitive and microscale method for drug screening combining affinity probes and single molecule fluorescence...

Area of Science:

• Biochemistry
• Analytical Chemistry
• Pharmacology

Background:

• Drug screening requires sensitive and efficient methods.
• Fluorescence correlation spectroscopy (FCS) offers high sensitivity for molecular interactions.
• Microscale techniques reduce sample and reagent consumption.

Purpose of the Study:

• To develop a sensitive, microscale drug screening method using FCS.
• To establish a theoretical model for drug screening based on competitive binding.
• To validate the method for screening protein kinase inhibitors.

Main Methods:

• Utilized fluorescence correlation spectroscopy (FCS) for sensitive detection.
• Employed a fluorescently labeled dasatinib derivative as an affinity probe.
• Developed a theoretical model for competitive binding assays.
• Synthesized and characterized fluorescent probe-target interactions.
• Used a microfluidic chip for sample handling.

Main Results:

• Established a theoretical model for drug screening via competitive binding.
• Determined binding and dissociation kinetics for a model inhibitor-target complex.
• Successfully screened six known drugs for chronic myeloid leukemia (CML) treatment.
• Achieved results consistent with reported values for drug-target interactions.
• Demonstrated low sample (1-2 μL) and reagent requirements.

Conclusions:

• The developed FCS method is a sensitive and universal platform for drug screening.
• The microscale approach significantly reduces sample and reagent needs.
• This method holds potential as a high-throughput screening platform for small molecule drugs.