Continuous and sensitive acid phosphatase assay based on a conjugated polyelectrolyte.

Area of Science:

• Biochemistry
• Analytical Chemistry
• Biophysics

Background:

• Acid phosphatases (ACPs) are crucial enzymes involved in various physiological and pathological processes.
• Existing assays for ACPs often lack sensitivity or are not suitable for high-throughput screening.
• Development of novel, sensitive, and continuous assays is essential for studying ACPs and their inhibitors.

Discussion:

• A novel fluorescence turn-on assay for ACPs was developed using a cationic conjugated polyelectrolyte (PPE4+) and p-nitrophenyl phosphate (pNPP).
• The assay monitors the hydrolysis of pNPP by ACPs via changes in PPE4+ fluorescence, providing sensitive and continuous detection.
• Kinetic parameters derived from the assay are consistent with literature values, validating the assay's performance.

Key Insights:

• The PPE4+/pNPP system offers a sensitive and continuous fluorescence turn-on method for ACP activity detection.
• The assay demonstrated successful application in high-throughput screening for ACP inhibitors.
• The assay is effective for in vitro detection of prostatic acid phosphatase (PAP).

Outlook:

• This assay provides a valuable tool for drug discovery targeting ACPs.
• Further applications in clinical diagnostics and biochemical research are anticipated.
• Optimization for different phosphatase substrates and enzyme classes may expand its utility.