Pagoamide A, A Cyclic Depsipeptide Isolated from a Cultured Marine Chlorophyte, Derbesia sp., using MS/MS Based Molecular Networking

Published on Jan 9, 2020in Journal of Natural Products4.05
路 DOI :10.1021/ACS.JNATPROD.9B01019
Hyun-Woo Kim23
Estimated H-index: 23
(UCSD: University of California, San Diego)
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Abstract
A thiazole-containing cyclic depsipeptide with 11 amino acid residues, named pagoamide A (1), was isolated from laboratory cultures of a marine Chlorophyte, Derbesia sp. This green algal sample was collected from America Samoa, and pagoamide A was isolated using guidance by MS/MS-based molecular networking. Cultures were grown in a light- and temperature-controlled environment and harvested after several months of growth. The planar structure of pagoamide A (1) was characterized by detailed 1D and 2D NMR experiments along with MS and UV analysis. The absolute configurations of its amino acid residues were determined by advanced Marfey鈥檚 analysis following chemical hydrolysis and hydrazinolysis reactions. Two of the residues in pagoamide A (1), phenylalanine and serine, each occurred twice in the molecule, once in the d- and once in the l-configuration. The biosynthetic origin of pagoamide A (1) was considered in light of other natural products investigations with coenocytic green algae.
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