title: Isolation and identification of 5-hydroxyl-5-methyl-2-hexenoic acid from Actinoplanes sp. HBDN08 with antifungal activity.
abstract: A bioactivity-guided approach was employed to isolate and determine the chemical identity of bioactive constituents with antifungal activity from Actinoplanes sp. HBDN08. The structure of the antifungal metabolite was elucidated as 5-hydroxyl-5-methyl-2-hexenoic acid on the basis of spectral analysis. This compound showed strong in vitro antifungal activity against Botrytis cinerea, Cladosporium cucumerinum and Corynespora cassiicola, with an IC(50) of 32.45, 27.17, and 30.66 mg/L, respectively; however, it only moderately inhibited hyphal growth of Rhizoctonia solani with an IC(50) of 61.64 mg/L. The in vivo antifungal activity under greenhouse conditions demonstrated that 5-hydroxyl-5-methyl-2-hexenoic acid could effectively control the diseases caused by B. cinerea, C. cucumerinum and C. cassiicola with 71.42%, 78.63% and 65.13% control values at 350 mg/L, respectively. This strong antifungal activity suggests that 5-hydroxyl-5-methyl-2-hexenoic acid might be a promising candidate for new antifungal agents.
authors.affiliation: School of Life Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, PR China.
authors.forename: Ji
authors.initials: J
authors.lastname: Zhang
authors.forename: Xiang-Jing
authors.initials: XJ
authors.lastname: Wang
authors.forename: Yi-Jun
authors.initials: YJ
authors.lastname: Yan
authors.forename: Ling
authors.initials: L
authors.lastname: Jiang
authors.forename: Ji-Dong
authors.initials: JD
authors.lastname: Wang
authors.forename: Bao-Ju
authors.initials: BJ
authors.lastname: Li
authors.forename: Wen-Sheng
authors.initials: WS
authors.lastname: Xiang
mesh_terms: D000935:Antifungal Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D002208:Caproates / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D005658:Fungi / Q000187:drug effects; D020128:Inhibitory Concentration 50; D008826:Microbial Sensitivity Tests; D008848:Micromonosporaceae / Q000737:chemistry* / Q000235:genetics; D010802:Phylogeny; D013997:Time Factors
chemical_list: C552944:5-hydroxy-5-methyl-2-hexenoic acid; D000935:Antifungal Agents; D002208:Caproates