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New metabolites of Fusarium martii related to dihydrofusarubin
Abstract:
Six strains of Fusarium martii produced fusarubin and dihydrofusarubins A and B. Further examination of strains, T-77 and T-127, showed that four additional metabolites were produced. By 1H and 13C NMR spectral analyses, these additional metabolites have been identified as 3-O-methyl and 3-O-ethyl ethers of fusarubin and dihydrofusarubin A. The methyl ethers are new compounds and showed moderate cytostatic activity against mouse leukemia L1210 culture cells as well as moderate antibiotic activity against leukemia L1210 culture cells as well as moderate antibiotic activity against Gram-positive bacteria and fungi. 3-O-Methyl and 3-O-ethyl ethers of dihydrofusarubin A were converted non-enzymically to the respective ethers of fusarubin under alkaline conditions. Since in addition, only dihydrofusarubin derivatives were formed when an acidic pH was maintained in the culture, it can be concluded that only these are true metabolites of Fusarium martii.
Insights
Six strains of Fusarium martii produce fusarubin and related compounds. New methyl ethers exhibit moderate anticancer and antibiotic properties, with dihydrofusarubin derivatives confirmed as the true fungal metabolites.
Area of Science:
- Mycology
- Natural Product Chemistry
- Pharmacology
Background:
- Fusarium martii is known to produce secondary metabolites.
- Fusarubin and dihydrofusarubins A and B have been previously identified from this fungus.
Purpose of the Study:
- To investigate further metabolites produced by Fusarium martii strains.
- To characterize the chemical structures and biological activities of novel compounds.
- To determine the true metabolites of Fusarium martii under different pH conditions.
Main Methods:
- Cultivation of Fusarium martii strains (T-77 and T-127).
- Extraction and purification of fungal metabolites.
- Structural elucidation using 1H and 13C Nuclear Magnetic Resonance (NMR) spectral analyses.
- Assessment of cytostatic and antibiotic activities.
- Chemical conversion studies under varying pH conditions.
Main Results:
- Four additional metabolites were identified: 3-O-methyl and 3-O-ethyl ethers of fusarubin and dihydrofusarubin A.
- The methyl ethers of fusarubin and dihydrofusarubin A are novel compounds.
- These new methyl ethers demonstrated moderate cytostatic activity against mouse leukemia L1210 cells.
- Moderate antibiotic activity was observed against Gram-positive bacteria and fungi.
- Dihydrofusarubin A ethers converted to fusarubin ethers under alkaline conditions.
- Only dihydrofusarubin derivatives were formed under acidic pH conditions.
Conclusions:
- The novel methyl ethers derived from Fusarium martii possess significant biological activities.
- Dihydrofusarubin derivatives are the authentic metabolites of Fusarium martii, as evidenced by their formation under acidic culture conditions.