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DOI: 10.1055/s-2007-981522
© Georg Thieme Verlag KG Stuttgart · New York
A Mycobacterium marinum Zone of Inhibition Assay as a Method for Screening Potential Antimycobacterial Compounds from Marine Extracts
Publication History
Received: September 23, 2006
Revised: April 11, 2007
Accepted: April 15, 2007
Publication Date:
30 May 2007 (online)
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Abstract
A novel screening method for antimycobacterial agents using Mycobacterium marinum was developed. M. marinum was selected as a model organism because it has a close phylogenetic relationship to M. tuberculosis, a relatively rapid doubling time, similar drug susceptibilities to M. tuberculosis, and less stringent safety requirements. More than 1000 crude marine and plant extracts were screened against M. marinum in a Zone of Inhibition (ZOI) assay, and twenty-one target extracts were identified. The crude organic extract of the marine sponge, Haliclona sp.10, was chosen for further investigation as it yielded a ZOI of 20 mm at a concentration of 80 μg/disk. Following bioassay-guided fractionation, (-)-papuamine was isolated, and yielded a 15 mm ZOI at a concentration of 25 μg/disk. In standard assays using M. marinum, (-)-papuamine exhibited both an MIC and an MBC95 of 6.25 μg/mL. This is the first report of antimycobacterial activity for (-)-papuamine. In addition, when (-)-papuamine and other natural product extracts were tested for activity against both M. marinum and M. tuberculosis, activity was comparable between the two species. These data indicate that (-)-papuamine is a promising lead for the development of new antimycobacterial agents and that M. marinum is a useful surrogate for the screening of antimycobacterial compounds.
Key words
Antimycobacterial - Haliclona sp. 10 - (-)-papuamine - Mycobacterium marinum
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1 These authors contributed equally
Dr. Leng Chee Chang, Assistant Professor
University of Hawaii
Hilo College of Pharmacy
60 Novelo St., Suite 101
Hilo
Hawaii 96720
Phone: (808) 443-5900
Fax: (808) 443-5903
Email: lengchee@hawaii.edu
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