Abstract
Melanins are high molecular weight hydrophobic pigments which have gained popularity for their role in virulence against different pathogens. In the present study, we isolated and characterized the melanin pigment produced by a dark septate endophyte fungus Phoma sp. RDSE17, which was associated with the roots of an indigenous Oryza sativa cv. 'Chakhao amubi' in Manipur, Northeast India. The biological properties of purified melanin from the fungus were evaluated for their antioxidant, antimicrobial and anticancerous activities. The pigment was extracted from Phoma sp. by alkaline–acid hydrolysis method and confirmed as melanin through physico-chemical tests and spectral (UV, FTIR, and EPR) analysis. The analyses of the elemental composition indicated that the pigment possessed a low percentage of nitrogen (N) contents, and therefore, would not fall under DOPA class of melanin. Exposure of the fungus to melanin pathway inhibitors revealed a positive melanin inhibition by tricyclazole, but not by kojic acid. Thus, the melanin from Phoma sp. may be a member of the DHN family. Moreover, the purified melanin showed high DPPH (1, 1-Diphenyl-2-picrylhydrazyl) free radical-scavenging activity with an EC50 of 69 µg/mL and inhibited human lung cancer cell (A549 cells) proliferation at 80 µg/mL. The present study demonstrates that melanin from Phoma sp. RDSE17 could be employed as a potential biological (antioxidant) and antimicrobial agent for inhibiting the growth of humans and phytopathogens.
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Acknowledgements
The authors (KS, RRP) thank ICAR-NBAIM-AMAAS Coordination Unit (ICAR/NBAIM/AMAAS/2017-20/GF/1a/531), Government of India, for providing the financial support of this work. We also appreciate the support of Sophisticated Analytical Instrument Facility (SAIF), Indian Institute of Technology, Madras, and Central Leather Research Institute, Chennai, for spectral analyses.
Funding
This work was supported by Indian Council of Agricultural Research (ICAR), New Delhi, India (Grand No: ICAR-NBAIM-AMAAS/2017-20/GF/1a/531).
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Surendirakumar, K., Pandey, R.R., Muthukumar, T. et al. Characterization and biological activities of melanin pigment from root endophytic fungus, Phoma sp. RDSE17. Arch Microbiol 204, 171 (2022). https://doi.org/10.1007/s00203-022-02788-y
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DOI: https://doi.org/10.1007/s00203-022-02788-y