Representative LC/UV chromatogram under typical analytical conditions (C18 column; mobile phase: 5–100% 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 Pyridoxatin. Representative 13C NMR (125 MHz) spectrum supporting structural assignment of Pyridoxatin.
Source Organism
Albophoma yamanashiensis.
Summary
Pyridoxatin is a fungal N-hydroxypyridone metabolite with iron-chelating and antifungal activity.
Details
Pyridoxatin is a hydroxamate-containing fungal secondary metabolite first identified as an inducer of erythropoietin gene expression in human cells. Structurally classified as an N-hydroxypyridone, pyridoxatin functions as an iron(III)-chelating agent and exhibits antioxidant properties under iron-dependent oxidative stress conditions. Mechanistic studies demonstrated that pyridoxatin inhibits ergosterol biosynthesis in Candida species, leading to antifungal activity independent of efflux pump mechanisms. Recent phenotypic screening studies further identified pyridoxatin as a promising lead compound against drug-resistant Acinetobacter baumannii.