title: Anti-Helicobacter pylori metabolites from Rhizoctonia sp. Cy064, an endophytic fungus in Cynodon dactylon.
abstract: A new benzophenone, named rhizoctonic acid (1), together with three known compounds monomethylsulochrin (2), ergosterol (3) and 3beta,5alpha,6beta-trihydroxyergosta-7,22-diene (4) were isolated through bioassay-guided fractionations from the culture of Rhizoctonia sp. (Cy064), an endophytic fungus in the leaf of Cynodon dactylon. The structure of the new acid 1 was elucidated to be 5-hydroxy-2-(2-hydroxy-6-methoxy-4-methylbenzoyl)-3-methoxybenzoic acid by a combination of spectral analyses. Furthermore, the structure of monomethylsulochrin 2 was confirmed by 13C-NMR analysis. All four metabolites were subjected to a more detailed in vitro assessment of their antibacterial action against five clinically isolated and one reference (ATCC 43504) Helicobacter pylori strains.
authors.affiliation: Institute of Functional Biomolecules, State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, PR China.
authors.forename: Y M
authors.initials: YM
authors.lastname: Ma
authors.forename: Y
authors.initials: Y
authors.lastname: Li
authors.forename: J Y
authors.initials: JY
authors.lastname: Liu
authors.forename: Y C
authors.initials: YC
authors.lastname: Song
authors.forename: R X
authors.initials: RX
authors.lastname: Tan
mesh_terms: D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D031744:Cynodon / Q000382:microbiology*; D016480:Helicobacter pylori / Q000145:classification / Q000187:drug effects*; D006801:Humans; D008826:Microbial Sensitivity Tests; D008517:Phytotherapy; D018515:Plant Leaves / Q000382:microbiology; D012232:Rhizoctonia
chemical_list: D000890:Anti-Infective Agents