Abstract
During the screening of endophytes obtained from Glycyrrhiza glabra Linn., the extract from a fungal culture designated as GG1F1 showed significant antimicrobial activity. The fungus was identified as a species of the genus Phoma and was most closely related to Phoma cucurbitacearum. The chemical investigation of the GG1F1 extract led to the isolation and characterization of two thiodiketopiperazine derivatives. Both the compounds inhibited the growth of several bacterial pathogens especially that of Staphylococcus aureus and Streptococcus pyogenes, with IC50 values of less than 10 μM. The compounds strongly inhibited biofilm formation in both the pathogens. In vitro time kill kinetics showed efficient bactericidal activity of these compounds. The compounds were found to act synergistically with streptomycin while producing varying effects in combination with ciprofloxacin and ampicillin. The compounds inhibited bacterial transcription/translation in vitro, and also inhibited staphyloxanthin production in S. aureus. Although similar in structure, they differed significantly in some of their properties, particularly the effect on the expression of pathogenecity related genes in S. aureus at sub-lethal concentrations. Keeping in view the antimicrobial potential of these compounds, it would be needful to scale up the production of these compounds through fermentation technology and further explore their potential as antibiotics using in vivo models.
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Acknowledgments
This work was supported by the CSIR 12th FYP project (Grant number: PMSI-BSC0117) of the Council of Scientific and Industrial Research (CSIR), New Delhi, India, and the Major Lab Project, MLP1008 of the institute. The first author is supported by Department of Science and Technology, New Delhi, India, through INSPIRE Senior Research Fellowship. We are grateful to Dr. Suphla Gupta for providing the plant material. The article bears the institutional manuscript no. IIIM/1934/2016.
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Arora, P., Wani, Z.A., Nalli, Y. et al. Antimicrobial Potential of Thiodiketopiperazine Derivatives Produced by Phoma sp., an Endophyte of Glycyrrhiza glabra Linn.. Microb Ecol 72, 802–812 (2016). https://doi.org/10.1007/s00248-016-0805-x
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DOI: https://doi.org/10.1007/s00248-016-0805-x