Representative LC/UV chromatogram under typical analytical conditions (C18 column; mobile phase: 30–70% ACN / H2O (0.05% H3PO4), linear gradient 20 min; flow rate: 0.2 mL/min; detection: 210 nm).
NMR Spectral Data
Representative 1H NMR (500 MHz) spectrum confirming the structure of Amidepsine D. Representative 13C NMR (125 MHz) spectrum supporting structural assignment of Amidepsine D.
Source Organism
Humicola sp.
Summary
Amidepsine D is a fungal depside structurally related to DGAT-inhibiting amidepsines and studied as a lipid biosynthesis scaffold.
Details
Amidepsine D is a fungal secondary metabolite isolated from the DGAT inhibitor-producing strain Humicola sp. FO-2942. Structural analysis identified amidepsine D as 2,4-di-O-methylgryphoric acid, a depside-type aromatic compound. Unlike amidepsines A-C, which possess N-alanine or N-valine amide moieties and exhibit DGAT inhibitory activity, amidepsine D corresponds to a methylated gryphoric acid derivative and represents a structurally related metabolite from the same biosynthetic context.