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Azole-synergistic anti-candidal activity of altenusin, a biphenyl metabolite of the endophytic fungus Alternaria alternata isolated from Terminalia chebula Retz.

  • Microbial Physiology and Biochemistry
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Abstract

In this study, a tropical endophytic fungus, Alternaria alternata Tche-153 was isolated from a Thai medicinal plant Terminalia chebula Rezt. The ethyl acetate extract prepared from the fermentation broth exhibited significant ketoconazole-synergistic activity against Candida albicans. Bioassay-directed fractionation of the ethyl acetate extract led to the isolation of altenusin (1), isoochracinic acid (2), and altenuic acid (3) together with 2,5-dimethyl-7-hydroxychromone (4). Using the disc diffusion method and the microdilution chequerboard technique, only altenusin (1) in combination with each of three azole drugs, ketoconazole, fluconazole or itraconazole at their low sub-inhibitory concentrations exhibited potent synergistic activity against C. albicans with the fractional inhibitory concentration index range of 0.078 to 0.188. This first discovery of altenusin (1) as a new azole-synergistic prototype possessing a biphenyl structure is of significance for further development of new azole-synergists to treat invasive candidiasis.

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Authors and Affiliations

  1. Center of Bioactive Natural Products from Marine Organisms and Endophytic Fungi (BNPME), Department of Pharmacognosy and Pharmaceutical Botany, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok, 10330, Thailand

    Jatuporn Phaopongthai & Khanit Suwanborirux

  2. Department of Microbiology, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand

    Suthep Wiyakrutta

  3. Department of Biochemistry and Microbiology, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok, 10330, Thailand

    Duangdeun Meksuriyen & Nongluksna Sriubolmas

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  1. Jatuporn Phaopongthai
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  2. Suthep Wiyakrutta
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  3. Duangdeun Meksuriyen
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  4. Nongluksna Sriubolmas
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  5. Khanit Suwanborirux
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Correspondence to Khanit Suwanborirux.

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Phaopongthai, J., Wiyakrutta, S., Meksuriyen, D. et al. Azole-synergistic anti-candidal activity of altenusin, a biphenyl metabolite of the endophytic fungus Alternaria alternata isolated from Terminalia chebula Retz.. J Microbiol. 51, 821–828 (2013). https://doi.org/10.1007/s12275-013-3189-3

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