Synthesis and biological evaluation of coprinoferrin, an acylated tripeptide hydroxamate siderophore.

Coprinoferrin (CPF), originally isolated from a genetically engineered strain (ΔlaeA) of the mushroom fungus Coprinopsis cinerea, is an acylated tripeptide hydroxamate consisting of tandem aligned N5-hexanoyl-N5-hydroxy-L-ornithine with modifications of N-acetyl and C-carboxamide. These unique chemical properties make CPF an iron(III) binder (siderophore), which helps in iron acquisition from the environment and promotes hyphal growth as well as fruiting body formation in C. cinerea. However, CPF's detailed mode of action remains enigmatic. In this study, we have accomplished the synthesis of CPF from N-Boc-L-glutamic acid 5-benzyl ester. The physicochemical characteristics, spectroscopic features, and biological activity observed in the synthetic CPF closely match those of natural CPF. This alignment provides unequivocal confirmation of the proposed chemical structure, facilitating a deeper understanding of its physiological role in nature, particularly in fruiting body formation.