Just-in-time purification: an effective solution for cherry-picking and purifying active compounds from large legacy...

Area of Science:

• Medicinal Chemistry
• Drug Discovery
• High-Throughput Screening

Background:

• Companies maintain compound libraries with both purified and unpurified substances.
• Unpurified compound mixtures can yield inaccurate results in biological assays.
• False positives in screening can arise from impurities in compound samples.

Purpose of the Study:

• To demonstrate the impact of compound purification on observed activity.
• To emphasize the necessity of retesting purified compounds for reliable structure-activity relationships.
• To present a semiautomated process for purifying active compounds identified in screening.

Main Methods:

• Comparative analysis of crude versus purified compounds in SXR-GAL4 and HIV assays.
• Purification of 61 active crude synthetic mixtures from proprietary compound screening.
• Development and implementation of a semiautomated cherry-picking and purification workflow.

Main Results:

• Crude mixtures increased false positives in the SXR-GAL4 assay compared to purified counterparts.
• Out of 61 purified active compounds, 32 showed a 5-fold decrease in activity, and 2 showed a 5-fold increase.
• A semiautomated process was successfully implemented for compound purification.

Conclusions:

• Compound purification significantly impacts observed biological activity and is essential for accurate SAR.
• Retesting purified compounds is critical to avoid false positives and ensure data integrity.
• The developed semiautomated process enhances efficiency in purifying hits from high-throughput screening.