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de Oliveira PCO, Ceroullo MS, Dos Santos MB, Medeiros PRC, Marques BCB, Tinoco LW, de Souza MCBV, da Costa Santos Boechat F, de Moraes MC. Nucleoside hydrolase immobilized on magnetic particles as a tool for onflow screening and characterization of inhibitors. J Pharm Biomed Anal 2023; 235:115589. [PMID: 37531732 DOI: 10.1016/j.jpba.2023.115589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/14/2023] [Accepted: 07/15/2023] [Indexed: 08/04/2023]
Abstract
Nucleoside Hydrolases (NH) are considered a target for the development of new antiprotozoal agents. The development of new and automated screening assays for the identification of NH inhibitors can accelerate the first stages of the drug discovery process. In this work, NH from Leishmania donovani (LdNH) was covalently immobilized onto magnetic particles (LdNH-MPs) and trapped by magnets into a TFE tube to yield an immobilized enzyme reactor (IMER). For an automated assay, the LdNH-MP-IMER was connected in-line to an analytical column in an HPLC-DAD system to monitor the enzyme activity through quantification of the product hypoxanthine. Kinetic studies provided a KM value of 2079 ± 87 µmol.L-1 for the inosine substrate. Validation of the LdNH-MP-IMER for onflow screening purposes was performed with a library containing 12 quinolone ribonucleosides. Among them, three were identified as new competitive LdNH inhibitors, with Ki values between 83.5 and 169.4 µmol.L-1. This novel in-line screening assay has proven to be reliable, fast, low cost, and applicable to large libraries of compounds.
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Affiliation(s)
| | - Millena Santana Ceroullo
- BioCrom, Organic Chemistry Department, Chemistry Institute, Fluminense Federal University, Niterói, RJ, Brazil
| | - Mayane Barbosa Dos Santos
- LNHC, Organic Chemistry Department, Chemistry Institute, Fluminense Federal University, Niterói, RJ, Brazil
| | | | - Bruno Clemente Brandão Marques
- Laboratory for Analysis and Development of Enzyme Inhibitors, Natural Products Research Institute, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Luzineide Wanderley Tinoco
- Laboratory for Analysis and Development of Enzyme Inhibitors, Natural Products Research Institute, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | | | | | - Marcela Cristina de Moraes
- BioCrom, Organic Chemistry Department, Chemistry Institute, Fluminense Federal University, Niterói, RJ, Brazil.
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