Ilamycins/rufomycins are marine cycloheptapeptides containing unusual amino acids. Produced by Streptomyces sp. and isolated in 1962, these compounds show potent activity against a range of mycobacteria, including multidrug-resistant strains of Mycobacterium tuberculosis. The cyclic peptides target the AAA+ protein ClpC1 that, together with the peptidases ClpP1/ClpP2, forms an essential ATP-driven protease.
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Derivatives of the ilamycins with a simplified tryptophane unit are synthesized in a straightforward manner. A ilamycin derivative with a cyclic hemiaminal structure is active in the nM-range against several mycobacterial strains and shows no significant cytotoxicity. Detailed investigations of the mode of action of indicate that itderegulates ClpC1 activity and strongly enhances ClpC1-WT ATPase activity.
U. Kazmaier, L. Junk, “The Synthesis of Ilamycins/Rufomycins and Cyclomarins, Marine Cyclopeptides that Demonstrate anti-Malaria and anti-Tuberculosis Activity”, Mar. Drugs 2021, 19, 446. DOI: 10.3390/md19080446.
J. Greve, A. Mogk, U. Kazmaier, “Total Synthesis and Biological Evaluation of Modified Ilamycin Derivatives”, Mar. Drugs 2022, 20, 632. DOI: 10.3390/md20100632.