Isolation, structural elucidation and biosynthetic pathway of bioactive prenyl quinone compounds from Panus lecomtei based on untargeted metabolomics combined with molecular networking.

Panus lecomtei is a relatively unfamiliar and undeveloped mushroom. This study generated ethyl acetate extracts of P. lecomtei intracellular (I), extracellular (E) and total fermentation broth (T). Both E and T extracts demonstrated antioxidant and antibacterial activities at 100 to 200 μg/mL. The composition differences of metabolites of these extracts were further studied based on comparative metabolomics by LS/MS and molecular network analysis. The results revealed that there were over 2000 significantly distinct metabolites among the three extracts, with abundant prenyl quinone compounds. Furthermore, the molecular network clarified the conversion relationship of P. lecomtei metabolites. Seven known prenyl quinone derivatives (1 – 7) were isolated from the E extract. Among them, compound 3 displayed excellent antioxidant activity and modest antibacterial activity. Compound 5 was discovered in fungi for the first time. Finally, a potential biosynthetic route for prenyl quinone in P. lecomtei was suggested. • Over 2000 significantly distinct metabolites were identified among the I/E/T extracts of P. lecomtei. • Seven known prenyl quinone derivatives compounds were discovered in E extract. • 2,2-dimethyl-2H-1-benzopyran-6-ol displayed excellent antioxidant activity. • A potential biosynthetic route for prenyl quinone in P. lecomtei was proposed. • Molecular network of P. lecomtei was analysed based on MS/MS. [ABSTRACT FROM AUTHOR]