Wollamides: Antimycobacterial Cyclic Hexapeptides from an Australian Soil Streptomyces

Zeinab G. Khalil, Angela A. Salim, Ernest Lacey, Antje Blumenthal, and Robert J. Capon

Organic Letters 2014, 16, 5120-5123.

Publication Date: September 17, 2014



A soil Streptomyces nov. sp. (MST-115088) isolated from semiarid terrain near Wollogorang Station, Queensland, returned two known and two new examples of a rare class of cyclic hexapeptide, desotamides A and B (1 and 2) and E and F (3 and 4), respectively, together with two new d-Orn homologues, wollamides A and B (5 and 6). Structures were assigned by detailed spectroscopic and C3 Marfey’s analysis. The desotamides/wollamides exhibit growth inhibitory activity against Gram-positive bacteria (IC50 0.6–7 μM) and are noncytotoxic to mammalian cells (IC50 >30 μM). The wollamides exhibit antimycobacterial activity (IC50 2.8 and 3.1 μM), including reduction in the intracellular mycobacterial survival in murine bone marrow-derived macrophages.

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