Plasmonic nanoparticle-assisted single-molecule dynamic binding for protein kinase activity digital counting.

Area of Science:

• Biochemistry
• Nanotechnology
• Analytical Chemistry

Background:

• Protein kinase activity assays are crucial for understanding cellular signaling and disease.
• Current methods often face limitations in sensitivity and concentration dependence.
• Single-molecule detection offers potential for improved assay performance.

Purpose of the Study:

• To develop a novel digital counting assay for protein kinase activity.
• To overcome the concentration-dependent limitations of existing single-molecule detection methods.
• To achieve high sensitivity and selectivity in protein kinase assays.

Main Methods:

• Utilized plasmonic nanoparticle-assisted dynamic binding for single-molecule detection.
• Developed a digital counting strategy to quantify kinase activity.
• Applied the assay to detect protein kinase A (PKA) activity.

Main Results:

• The assay successfully broke the concentration-dependent limitation in single-molecule detection.
• Achieved high selectivity and sensitivity for protein kinase activity.
• Demonstrated a low detection limit of 0.0001 U mL^-1 for PKA.

Conclusions:

• The developed plasmonic nanoparticle-assisted assay offers a sensitive and selective method for digital counting of protein kinase activity.
• This approach has broad applicability in drug screening and medical diagnostics.
• The method advances single-molecule detection capabilities for biochemical assays.