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Thielavins: tuned biosynthesis and LR-HSQMBC for structure elucidation
Zeinab Y Al Subeh1, Huzefa A Raja1, Amanda Maldonado2
1Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC, USA.
The Journal of Antibiotics
|January 26, 2021
Summary
Researchers isolated thielavins, including a new compound, from a fungus. Optimal growth conditions and structural analysis were identified, and the compounds showed cytotoxic activity against cancer cell lines.
Area of Science:
- Natural Product Chemistry
- Mycology
- Chemical Biology
Background:
- Fungal secondary metabolites are a rich source of bioactive compounds.
- Thielavins are a class of natural products with potential biological activities.
- Understanding factors influencing thielavin biosynthesis is crucial for their isolation and application.
Purpose of the Study:
- To isolate and characterize thielavins from a Shiraia-like fungal strain.
- To investigate the effects of different media and light conditions on thielavin production.
- To evaluate the cytotoxic potential of isolated thielavins against cancer cell lines.
Main Methods:
- Cultivation of Shiraia-like sp. (MSX60519) under varied conditions.
- Isolation and purification of thielavins using chromatographic techniques.
- Structure elucidation of thielavin Z8 using NMR spectroscopy (LR-HSQMBC, NOESY) and mass spectrometry.
- Cytotoxicity assays against human breast, ovarian, and melanoma cancer cell lines.
Main Results:
- Thielavins I, V, Q, and a new compound, thielavin Z8, were isolated.
- Rice substrate with a 12:12 h light:dark cycle enhanced thielavin biosynthesis.
- Oatmeal medium and continuous light inhibited production.
- NMR data confirmed the structure of thielavin Z8.
- Compounds 1-4 demonstrated cytotoxic activity at the micromolar level.
Conclusions:
- Environmental factors significantly impact thielavin production in Shiraia-like fungi.
- NMR techniques, particularly LR-HSQMBC and NOESY, are effective for elucidating complex natural products.
- Isolated thielavins possess cytotoxic properties, suggesting potential as anticancer agents.
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