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In the screening for muscarinic M3 receptor binding inhibitors from microbial secondary metabolites, the extract of Nocardia nova JCM 6044 was found to be highly active. Bioassay-guided isolation led to the identification of three siderophores, nocardimicins G (1), H (2) and I (3). Their chemical structures were determined by spectroscopic analysis using NMR and MS. 1 and 2 inhibited the binding of tritium-labeled N-methylscopolamine to the muscarinic M3 receptor with Ki values of 0.44 microM and 0.37 microM, respectively, whereas 3 showed no inhibition at 10 microM. 1 and 2 also showed weak binding inhibitory activity to the M5 receptor but not to the M1, M2 and M4 receptors at 10 microM.

Nocardimicins G, H and I, Siderophores with Muscarinic M3 Receptor Binding Inhibitory Activity from Nocardia nova JCM 6044