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Two novel cyclic depsipeptides Xenematides F and G from the entomopathogenic bacterium Xenorhabdus budapestensis

Xi Xuedong,Lu Xingzhong,Zhang Xiaodong,Bi Yuhui,Li Xiaochun,Yu Zhiguo

Two novel depsipeptides xenematides F and G ( 1 , 2 ), were isolated from entomopathogenic Xenorhabdus budapestensis SN84 along with a known compound xenematide B. The structures of the two new molecules were elucidated using NMR, MS and Marfey’s method. The xenematide G ( 2 ) contains α-aminoheptanoic acid, a non-protein amino acid that is rarely found in secondary metabolites from entomopathogenic bacteria. Xenematides F and G were tested for antibacterial activity. Xenematide G ( 2 ) exhibited moderate antibacterial activity.