Cyclic heptapeptides from the soil-derived fungus Clonostachys rosea.

ID: ALA4385649

Journal: Bioorg Med Chem

Title: Cyclic heptapeptides from the soil-derived fungus Clonostachys rosea.

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.

CiteXplore: 31324567

DOI: 10.1016/j.bmc.2019.07.025

Patent ID: ┄