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Kimishima A, Tsuruoka I, Tsutsumi H, Honsho M, Honma S, Matsui H, Sugamata M, Wasuwanich P, Inahashi Y, Hanaki H, Asami Y. A new tetronomycin analog, broad-spectrum and potent antibiotic against drug-resistant Gram-positive bacteria. Chem Biodivers 2024; 21:e202301834. [PMID: 38179845 DOI: 10.1002/cbdv.202301834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 01/04/2024] [Accepted: 01/04/2024] [Indexed: 01/06/2024]
Abstract
We discovered a new tetronomycin analog, C-32-OH tetronomycin (2) from the Streptomyces sp. K20-0247 strain, which produces tetronomycin (1). After NMR analysis of 2, we determined the planar structure. Futhermore, the absolute stereochemistry of 2 was deduced based on the biosynthetic pathway of 1 in the K20-0247 strain and a comparison of experimental electronic circular dichroism (ECD) results of 1 with 2. While 2 exihibits potent antibacterial activity aganist Gram-positive baceria including vancomycin-intermediate Staphylococcus aureus (VISA) strains and vancomycin-resistant Enterococci (VRE), the antibacterial activity of 2 shows 16-32-folds weaker than that of 1 suggesting that the C-34 methyl group in 1 is one of the very important functinal group. Moreover, we evaluated the ionophore activity of 1 and 2 and neither compound shows ionophore activity at reasonable concetrations. Our research suggests that 1 and 2 would have different target(s) from an ionophore mechanism in the antibacterial activity and tetronomycins are promising natural products for broad-spectrum antibiotics.
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Affiliation(s)
- Aoi Kimishima
- Graduate School of Infection Control Sciences, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
- Ōmura Satoshi Memorial Institute, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
| | - Iori Tsuruoka
- Graduate School of Infection Control Sciences, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
| | - Hayama Tsutsumi
- Graduate School of Infection Control Sciences, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
- Ōmura Satoshi Memorial Institute, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
| | - Masako Honsho
- Graduate School of Infection Control Sciences, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
- Ōmura Satoshi Memorial Institute, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
| | - Sota Honma
- Graduate School of Infection Control Sciences, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
- Ōmura Satoshi Memorial Institute, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
| | - Hidehito Matsui
- Graduate School of Infection Control Sciences, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
- Ōmura Satoshi Memorial Institute, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
| | - Miho Sugamata
- Graduate School of Infection Control Sciences, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
- Ōmura Satoshi Memorial Institute, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
| | - Paul Wasuwanich
- University of Florida College of Medicine, Gainesville, FL 32610, USA
| | - Yuki Inahashi
- Graduate School of Infection Control Sciences, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
- Ōmura Satoshi Memorial Institute, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
| | - Hideaki Hanaki
- Graduate School of Infection Control Sciences, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
- Ōmura Satoshi Memorial Institute, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
| | - Yukihiro Asami
- Graduate School of Infection Control Sciences, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
- Ōmura Satoshi Memorial Institute, Kitasato University, 5-9-1 Shirokane Minato-ku, 108-8641, Tokyo, Japan
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Chin EJ, Ching KC, Tan ZY, Wibowo M, Leong CY, Yang LK, Ng VWP, Seow DCS, Kanagasundaram Y, Ng SB. Natural Products from Singapore Soil-Derived Streptomycetaceae Family and Evaluation of Their Biological Activities. Molecules 2023; 28:5832. [PMID: 37570802 PMCID: PMC10421265 DOI: 10.3390/molecules28155832] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 07/26/2023] [Accepted: 07/26/2023] [Indexed: 08/13/2023] Open
Abstract
Natural products have long been used as a source of antimicrobial agents against various microorganisms. Actinobacteria are a group of bacteria best known to produce a wide variety of bioactive secondary metabolites, including many antimicrobial agents. In this study, four actinobacterial strains found in Singapore terrestrial soil were investigated as potential sources of new antimicrobial compounds. Large-scale cultivation, chemical, and biological investigation led to the isolation of a previously undescribed tetronomycin A (1) that demonstrated inhibitory activities against both Gram-positive bacteria Staphylococcus aureus (SA) and methicillin-resistant Staphylococcus aureus (MRSA) (i.e., MIC90 of 2-4 μM and MBC90 of 9-12 μM), and several known antimicrobial compounds, namely nonactin, monactin, dinactin, 4E-deacetylchromomycin A3, chromomycin A2, soyasaponin II, lysolipin I, tetronomycin, and naphthomevalin. Tetronomycin showed a two- to six-fold increase in antibacterial activity (i.e., MIC90 and MBC90 of 1-2 μM) as compared to tetronomycin A (1), indicating the presence of an oxy-methyl group at the C-27 position is important for antibacterial activity.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Yoganathan Kanagasundaram
- Singapore Institute of Food and Biotechnology Innovation (SIFBI), Agency for Science, Technology and Research (A*STAR), Singapore 138673, Singapore; (E.-J.C.); (K.-C.C.); (Z.Y.T.); (M.W.); (C.-Y.L.); (L.-K.Y.); (V.W.P.N.); (D.C.S.S.)
| | - Siew-Bee Ng
- Singapore Institute of Food and Biotechnology Innovation (SIFBI), Agency for Science, Technology and Research (A*STAR), Singapore 138673, Singapore; (E.-J.C.); (K.-C.C.); (Z.Y.T.); (M.W.); (C.-Y.L.); (L.-K.Y.); (V.W.P.N.); (D.C.S.S.)
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