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Antioxidant compounds produced by endolichenic fungus Penicillium sp.-strain 1322P isolated from Pyxine subcinerea

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Abstract

Endolichenic fungi are expecting for new bioresources of pharmacological compounds. However, the number of investigations targeting antioxidant compounds produced by endolichenic fungi remains limited. To discover new antioxidant compounds, we analyzed the antioxidant activity of the methanol extracts derived from isolated lichen mycobionts or endolichenic fungi induced from Pyxine subcinerea. We performed this analysis using the oxygen radical absorbance capacity (ORAC) method. As a result, we isolated from an endolichenic fungus identified as Penicillium sp.-stain 1322P in Pyxine subcinerea. This fungus produced a red pigment, and its chemical structure was determined to be sclerotioramine based on the analytical data obtained from NMR, LC-MS/MS, and HPLC-PDA. Sclerotioramine exhibited high antioxidant activity, and the ORAC values (mean ± SD) of sclerotioramine and sclerotiorin were 11.4 ± 0.36 and 4.86 ± 0.70 mmol TE per gram of the respective pure compound. Thus, the antioxidant activity of sclerotioramine was greater than twice that of sclerotiorin. This work represents the first report that the antioxidant activity of sclerotioramine is higher than that of the sclerotiorin.

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Acknowledgements

This work was supported by JSPS KAKENHI Grant Number JP19K23668. The authors report no potential conflicts of interest.

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H.K. cultured fungi, determined the chemical structure of active compounds, and descripted this report. N.W. and Y.M. isolated fungi and purified the active compounds. K.H. identified cultured fungi. M.K. provided financial support.

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Correspondence to Hiroko Kawakami.

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Communicated by Yusuf Akhter.

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Kawakami, H., Watabe, N., Matsubuchi, Y. et al. Antioxidant compounds produced by endolichenic fungus Penicillium sp.-strain 1322P isolated from Pyxine subcinerea. Arch Microbiol 206, 187 (2024). https://doi.org/10.1007/s00203-024-03898-5

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