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From seven different pathovars of Pseudomonas syringae representing various genetic subgroups, and one strain of Pseudomonas viridiflava the same pyoverdin siderophore (1) was isolated, probably identical with the pyoverdin whose amino acid composition (but not their sequence) had been reported before. 1 is the first pyoverdin where two of the ligands for Fe 3+  are β-hydroxy Asp units. Its remarkably high complexing constant for Fe 3+  at pH 5 as compared with other pyoverdins offers a definite advantage in plant infection. The structure elucidation of 1 will be described and the taxonomical implications regarding pyoverdins with different structures ascribed previously to P. syringae strains will be discussed.

The Structure of the Pyoverdin Isolated from Various Pseudomonas syringae Pathovars