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Liquid Chromatography

Microbial Screening of Marine Natural Product Inhibitors for the 6′-Aminoglycoside Acetyltransferase 2″-Aminoglycoside Phosphotransferase [AAC(6′)-APH(2″)] Bifunctional Enzyme by Ultra-High Performance Liquid Chromatography–Mass Spectrometry (UHPLC-MS)

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Pages 2895-2907 | Received 08 Jan 2021, Accepted 10 Mar 2021, Published online: 27 Mar 2021
 

Abstract

Aminoglycoside antibiotics exhibit broad-spectrum antibacterial activity, good efficacy, and stability. However, due to the emergence of antibiotic resistance, their use as broad-spectrum antibiotics is restricted. Bacteria producing the bifunctional enzyme, 6′-aminoglycoside acetyltransferase 2″-aminoglycoside phosphotransferase [AAC(6′)-APH(2″)], can modify aminoglycoside antibiotics, leading to the emergence of clinical drug resistance. A method based on ultra-high performance liquid chromatography–mass spectrometry (UHPLC-MS) is reported to monitor the modification of aminoglycoside antibiotics and to screen potential inhibitors of AAC(6′)-APH(2″) from marine natural products. Instead of using purified AAC(6′)-APH(2″), Escherichia coli cells harboring AAC(6′)-APH(2″) were employed. In vivo enzyme assays, conducted in the physiological environment, compensated for the disparity between in vitro responses and those in living cells. The inhibition zone method was used to verify the reliability of the UHPLC-MS results. From a library of 63 marine natural products, Mer-C-3 and Mer-c-8e pyridine alkaloids were shown to provide inhibitory activity against AAC(6′)-APH(2″) in living bacteria. The UHPLC-MS-based approach offers improved speed, convenience, and sensitivity compared with the traditional inhibition zone assay for the screening of enzyme inhibitors.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (21505124), and China Postdoctoral Science Foundation (2015M582144).

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