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• W2024295111 abstract "Label-free mass spectrometric (MS) technologies are particularly useful for enzyme assay design for drug discovery screens. MS permits the selective detection of enzyme substrates or products in a wide range of biological matrices without need for derivatization, labeling, or capture technologies. As part of a cardiovascular drug discovery effort aimed at finding modulators of cystathionine beta-synthase (CBS), we used the RapidFire((R)) label-free high-throughput MS (HTMS) technology to develop a high-throughput screening (HTS) assay for CBS activity. The in vitro assay used HTMS to quantify the unlabeled product of the CBS reaction, cystathionine. Cystathionine HTMS analyses were carried out with a throughput of 7 s per sample and quantitation over a linear range of 80-10,000 nM. A compound library of 25,559 samples (or 80 384-well plates) was screened as singlets using the HTMS assay in a period of 8 days. With a hit rate of 0.32%, the actives showed a 90% confirmation rate. The in vitro assay was applied to secondary screens in more complex matrices with no additional analytical development. Our results show that the HTMS method was useful for screening samples containing serum, for cell-based assays, and for liver explants. The novel extension of the in vitro analytical method, without modification, to secondary assays resulted in a significant and advantageous economy of development time for the drug discovery project." @default.
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• W2024295111 date "2009-10-01" @default.
• W2024295111 modified "2023-09-23" @default.
• W2024295111 title "Label-Free High-Throughput Screening via Mass Spectrometry: A Single Cystathionine Quantitative Method for Multiple Applications" @default.
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• W2024295111 doi "https://doi.org/10.1089/adt.2009.0200" @default.
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