Siderophores of highly phytopathogenicAlternaria longipes

Abstract
Alternaria longipes ATCC 26293, a highly phytopathogenic fungus, has been found to produce a large number of siderophores under iron-deficient conditions. Most of the compounds are members of the coprogen family. Structures of three novel siderophores, termed hydroxycoprogens, have been determined by1H and13C NMR, FAB mass spectrometry and partial hydrolysis. The compounds are analogs of coprogen, neocoprogen I and isoneocoprogen I, in which one of the terminaltrans-anhydromevalonic acid residues is replaced by atrans-4,5 dihydroxy-3-methyl-2-pentenoic acid residue.