A high-throughput screening method based on the competitive binding of a lumazine synthase inhibitor and riboflavin to the active site of Schizosaccharomyces pombe lumazine synthase was developed. This assay is sensitive, simple, and robust. During assay development, all of the known active inhibitors tested were positively identified. Preliminary high-throughput screening in 384-well format resulted in a Z factor of 0.7. The approach utilizes a thermodynamic assay to bypass the problems associated with the instabilities of both lumazine synthase substrates that complicate the use of a kinetic assay in a high-throughput format, and it removes the time element from the assay, thus simplifying the procedure.
Bibliographical noteFunding Information:
This research was made possible by NIH Grant GM51469 and by support from the Deutsche Forschungsgemeinschaft, Fonds der Chemischen Industrie, and the Hans Fischer Gesellschaft. The KU-High Throughput Screening Laboratory was established through funding from the National Institutes of Health COBRE award 1 P20 RR15563, from the State of Kansas, and the University of Kansas.
- Enzyme inhibitor discovery
- High-throughput screening
- Lumazine synthase
- Riboflavin synthase