Cyclic heptapeptides from the soil-derived fungus Clonostachys rosea.

Cyclic heptapeptides from the soil-derived fungus Clonostachys rosea.
Bioorg Med Chem. 2019 Jul 12;:
Authors: Abdel-Wahab NM, Harwoko H, Müller WEG, Hamacher A, Kassack MU, Fouad MA, Kamel MS, Lin W, Ebrahim W, Liu Z, Proksch P
Abstract
Three new cyclic heptapeptides (1-3) together with three known compounds (4-6) were isolated from a solid rice culture of the soil-derived fungus Clonostachys rosea. Fermentation of the fungus on white beans instead of rice afforded a new γ-lactam (7) and a known γ-lactone (8) that were not detected in the former extracts. The structures of the new compounds were elucidated on the basis of 1D and 2D NMR spectra as well as by HRESIMS data. Compounds 1 and 4 exhibited significant cytotoxicity against the L5178Y mouse lymphoma cell line with IC50 values of 4.1 and 0.1 µM, respectively. Compound 4 also displayed cytotoxicity against the A2780 human ovarian cancer cell line with an IC50 value of 3.5 µM. The preliminary structure-activity relationships are discussed.
PMID: 31324567 [PubMed - as supplied by publisher]

Source: Bioorganic and Medicinal Chemistry - July 11, 2019 Category: Chemistry Authors: Abdel-Wahab NM, Harwoko H, Müller WEG, Hamacher A, Kassack MU, Fouad MA, Kamel MS, Lin W, Ebrahim W, Liu Z, Proksch P Tags: Bioorg Med Chem Source Type: research