Versatile Detection of Cellular Protein via Fluorescence Anisotropy

Area of Science:

• Biochemistry
• Molecular Biology
• Biotechnology

Background:

• Protein detection is fundamental in life science research.
• Existing methods can be time-consuming or require specialized equipment.
• There is a need for accessible and efficient protein detection techniques.

Purpose of the Study:

• To introduce Cell Lysate Fluorescence Anisotropy (CFAST) as a novel protein detection method.
• To demonstrate the utility of CFAST in quantifying protein levels and identifying molecular interactions.
• To showcase CFAST's application in drug discovery and development.

Main Methods:

• CFAST utilizes a triangulenium dye-labeled nanobody probe to measure fluorescence anisotropy in cell lysates.
• Minimal sample preparation involves centrifugation and nuclease incubation.
• Thermal shift assays coupled with CFAST (thermal shift-CFAST) detect protein-small molecule interactions.

Main Results:

• CFAST accurately detects cellular levels of PARP1, MK2, and GFP.
• Thermal shift-CFAST quantifies dose-dependent inhibitor binding for PARP1 and MK2.
• High-throughput screening with thermal shift-CFAST identified a SOX2 binder and facilitated PROTAC development.

Conclusions:

• CFAST is a versatile, rapid (2-3 hours), and economical alternative for protein detection.
• CFAST facilitates drug discovery by enabling screening of small molecule interactions and development of targeted therapeutics.
• The method is scalable and uses common laboratory resources, making it broadly accessible.