title: Two new steroids from an endophytic fungus Phomopsis sp.
abstract: Two new steroids, (14β,22E)-9,14-dihydroxyergosta-4,7,22-triene-3,6-dione (1) and (5α,6β,15β,22E)-6-ethoxy-5,15-dihydroxyergosta-7,22-dien-3-one (2), together with three known steroids, calvasterols A and B (3 and 4, resp.), and ganodermaside D (5), were isolated from the culture broth of an endophytic fungus Phomopsis sp. isolated from Aconitum carmichaeli. The structures of these compounds were elucidated on the basis of spectroscopic analysis, and their inhibitory activities against six pathogenic fungi were evaluated. Most of the compounds showed moderate or weak antifungal activities in a broth-microdilution assay.
authors.affiliation: Key Laboratory for Microbial Resources of the Ministry of Education, Yunnan Institute of Microbiology, Yunnan University, Kunming 650091, PR China. shwu123@126.com.
authors.forename: Shao-Hua
authors.initials: SH
authors.lastname: Wu
authors.forename: Rong
authors.initials: R
authors.lastname: Huang
authors.forename: Cui-Ping
authors.initials: CP
authors.lastname: Miao
authors.forename: You-Wei
authors.initials: YW
authors.lastname: Chen
mesh_terms: D000935:Antifungal Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D004875:Ergosterol / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D005658:Fungi / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D004718:Saccharomycetales / Q000737:chemistry / Q000378:metabolism*; D013256:Steroids / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology
chemical_list: C586261:6-ethoxy-5,15-dihydroxyergosta-7,22-dien-3-one; C586260:9,14-dihydroxyergosta-4,7,22-triene-3,6-dione; D000935:Antifungal Agents; D013256:Steroids; D004875:Ergosterol
keywords: Antifungal activity; Fungi; Inhibitors; Phomopsis; Steroids