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Lee JH, Ma R, Nguyen L, Khan S, Qader M, Mpofu E, Shetye G, Krull NK, Augustinović M, Omarsdottir S, Cho S, Franzblau SG, Murphy BT. Discovery of a New Antibiotic Demethoxytetronasin Using a Dual-Sided Agar Plate Assay (DAPA). ACS Infect Dis 2023; 9:1593-1601. [PMID: 37450563 PMCID: PMC10426401 DOI: 10.1021/acsinfecdis.3c00171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Indexed: 07/18/2023]
Abstract
For over a century, researchers have cultured microorganisms together on solid support─typically agar─in order to observe growth inhibition via antibiotic production. These simple bioassays have been critical to both academic researchers that study antibiotic production in microorganisms and to the pharmaceutical industry's global effort to discover drugs. Despite the utility of agar assays to researchers around the globe, several limitations have prevented their widespread adoption in advanced high-throughput compound discovery and dereplication campaigns. To address a list of specific shortcomings, we developed the dual-sided agar plate assay (DAPA), which exists in a 96-well plate format, allows microorganisms to compete through opposing sides of a solid support in individual wells, is amenable to high-throughput screening and automation, is reusable, and is low-cost. Herein, we validate the use of DAPA as a tool for drug discovery and show its utility to discover new antibiotic natural products. From the screening of 217 bacterial isolates on multiple nutrient media against 3 pathogens, 55 hits were observed, 9 known antibiotics were dereplicated directly from agar plugs, and a new antibiotic, demethoxytetronasin (1), was isolated from a Streptomyces sp. These results demonstrate that DAPA is an effective, accessible, and low-cost tool to screen, dereplicate, and prioritize bacteria directly from solid support in the front end of antibiotic discovery pipelines.
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Affiliation(s)
- Jung-Ho Lee
- Department
of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago,, 833 S. Wood Street, Chicago, Illinois 60612, United States
| | - Rui Ma
- Institute
for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Linh Nguyen
- Department
of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago,, 833 S. Wood Street, Chicago, Illinois 60612, United States
- Institute
of Marine Biochemistry, Vietnam Academy
of Science and Technology, Nghiado, Caugiay, Hanoi 11307, Vietnam
| | - Shahebraj Khan
- Institute
for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Mallique Qader
- Institute
for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Enock Mpofu
- Institute
for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Gauri Shetye
- Institute
for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Nyssa K. Krull
- Department
of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago,, 833 S. Wood Street, Chicago, Illinois 60612, United States
| | - Mario Augustinović
- Department
of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago,, 833 S. Wood Street, Chicago, Illinois 60612, United States
| | - Sesselja Omarsdottir
- Faculty
of Pharmaceutical Sciences, University of
Iceland, Hagi, Hofsvallagata 53, Reykjavík IS-107, Iceland
| | - Sanghyun Cho
- Department
of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago,, 833 S. Wood Street, Chicago, Illinois 60612, United States
- Institute
for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Scott G. Franzblau
- Department
of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago,, 833 S. Wood Street, Chicago, Illinois 60612, United States
- Institute
for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Brian T. Murphy
- Department
of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago,, 833 S. Wood Street, Chicago, Illinois 60612, United States
- Institute
for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
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