Secoemestrin D, a cytotoxic epitetrathiodioxopiperizine, and emericellenes A-E, five sesterterpenoids from Emericella sp. AST0036, a fungal endophyte of Astragalus lentiginosus1.

ABSTRACT: A new epitetrathiodioxopiperizine, secoemestrin D (1), and five sesterterpenoids bearing a new carbon skeleton, emericellenes A-E (2-6), together with previously known fungal metabolites, sterigmatocystin (7), arugosin C (8), and epiisoshamixanthone (9), were obtained from the endophytic fungal strain Emericella sp. AST0036 isolated from a healthy leaf tissue of Astragalus lentiginosus. The planar structures and relative configurations of the new metabolites 1-6 were elucidated using MS and 1D and 2D NMR spectroscopic data. All compounds were evaluated for their potential anticancer activity using a panel of six tumor cell lines and normal human fibroblast cells. Only metabolites 1 and 7 showed cytotoxic activity. More importantly, secoemestrin D (1) exhibited significant cytotoxicity with

SUBMITTER: Xu YM 

PROVIDER: S-EPMC3946369 | biostudies-literature | 2013 Dec

REPOSITORIES: biostudies-literature