Journal
JOURNAL OF NATURAL PRODUCTS
Volume 81, Issue 2, Pages 286-291Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jnatprod.7b00713
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Funding
- German Academic Exchange Service (DAAD)
- Thai Royal Golden Jubilee-Industry Program (RGJ)
- RGJ [Ph.D/0138/2553, 4.S.MF/53/A.3]
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The discovery of a Hohenbuehelia grisea specimen during a field trip in Northern Thailand led to the isolation and identification of three novel sulfur-bearing derivatives of dihydropleurotinic acid (4). Thiopleurotinic acid A (1) was established by the interpretation of spectral data (HRESIMS, 2D-NMR) as a 2-hydroxy-3-mercaptopropanoic acid conjugate of dihydropleurotinic acid. Thiopleurotinic acid B (2) was shown to be the N-acetylcysteine conjugate of 4. A third compound (3) was established as a thiazole-containing derivative. Through feeding experiments with [U-C-13(3), N-15]-L-cysteine the formation of all three metabolites was shown to involve cysteine condensation with 4. The decreased cytotoxicity and antimicrobial activities of the new derivatives 1-3, compared to the parent compound 4, indicate a possible detoxification pathway of filamentous fungi.
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