title: Oridamycins A and B, anti-Saprolegnia parasitica indolosesquiterpenes isolated from Streptomyces sp. KS84.
abstract: Oridamycins A (1) and B (2) were isolated from the fermentation broth of Streptomyces sp. strain KS84 as selective anti-Saprolegnia parasitica antibiotics. Their structures were elucidated as pentacyclic indolosesquiterpenes by the combination of NMR and spectroscopic analyses. The absolute configuration of 1 was determined by ROESY analyses after the advanced Mosher analysis. Compound 1 exhibited anti-S. parasitica activity with an MIC value of 3.0 microg/mL, but was much less active against the phytopathogenic fungus Phoma sp. and the yeast Saccharomyces cerevisiae.
authors.affiliation: Laboratory of Microbial Chemistry, College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan.
authors.forename: Kentaro
authors.initials: K
authors.lastname: Takada
authors.forename: Hisatsugu
authors.initials: H
authors.lastname: Kajiwara
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Imamura
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D000890:Anti-Infective Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D000935:Antifungal Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D001203:Ascomycota / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D012441:Saccharomyces cerevisiae / Q000187:drug effects; D044762:Saprolegnia / Q000187:drug effects*; D012717:Sesquiterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D013302:Streptomyces / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D000935:Antifungal Agents; D012717:Sesquiterpenes; C549674:oridamycin A; C549675:oridamycin B