[Interaction and mechanism between poinicidin and BSA]

Area of Science:

• Pharmacology
• Analytical Chemistry
• Biochemistry

Background:

• Understanding drug-protein binding is essential for predicting pharmacokinetics and efficacy.
• Bovine serum albumin (BSA) is a common model protein for studying drug interactions.
• Ponicidin's binding characteristics with serum proteins require detailed investigation.

Purpose of the Study:

• To develop and validate a sensitive LC-MS/MS method for quantifying ponicidin.
• To determine the binding rate and mechanism of ponicidin with BSA.
• To calculate the binding constant (Ka) and number of binding sites (n) for ponicidin-BSA.

Main Methods:

• Ultrafiltration coupled with Liquid Chromatography-tandem Mass Spectrometry (LC-MS/MS) for protein binding assays.
• Scatchard equation analysis to determine binding parameters.
• Development of a specific and sensitive LC-MS/MS analytical method.

Main Results:

• The average protein binding rate of ponicidin with BSA was 57.2%.
• The binding constant (Ka) was determined to be 2.54×10⁴ L•μg⁻¹, with n=0.75 binding sites.
• Ponicidin-BSA binding showed no concentration dependence within the tested range.

Conclusions:

• The established LC-MS/MS method is sensitive, specific, and suitable for analyzing ponicidin-BSA binding.
• The binding characteristics provide a foundation for further research into ponicidin's clinical drug interactions and pharmacokinetics.
• Ponicidin demonstrates significant binding to BSA, indicating potential for protein-bound drug behavior in vivo.