Hashizume H, Iijima K, Yamashita K, Kimura T, Wada SI, Sawa R, Igarashi M. Valgamicin C, a novel cyclic depsipeptide containing the unusual amino acid cleonine, and related valgamicins A, T and V produced by Amycolatopsis sp. ML1-hF4.
J Antibiot (Tokyo) 2017;
71:ja2017135. [PMID:
29138482 DOI:
10.1038/ja.2017.135]
[Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 10/02/2017] [Accepted: 10/04/2017] [Indexed: 11/09/2022]
Abstract
In the course of optimizing pargamicin A production in Amycolatopsis sp. ML1-hF4, we discovered novel cyclic depsipeptide compounds in the broth and designated them valgamicins A, C, T and V. The structures of these molecules were determined by spectroscopic studies, advanced Marfey's method and X-ray crystal structural analysis. Valgamicin C contains the extremely rare amino acid cleonine. To our knowledge, this is the first report of a cleonine-containing metabolite from a naturally isolated microorganism without any breeding or mutation treatment. None of the valgamicins showed potent antibacterial activity against either Gram-positive or -negative bacteria. Valgamicins A, C and T exhibited moderate cytotoxicity against human tumor cell lines.The Journal of Antibiotics advance online publication, 15 November 2017; doi:10.1038/ja.2017.135.
Collapse