Identical Pyoverdines from Pseudomonas fluorescens 9AW and from Pseudomonas putida 9BW

Abstract Pseudomonas fluorescens, Pseudomonas putida, Pyoverdine, Siderophore, Bacterial Classification From Pseudom onas fluorescens 9AW and from Pseudomonas putida 9BW identical pyo-verdine-type siderophores were isolated and their structures were elucidated by spectroscopic methods and degradation studies. These novel compounds are of interest as they contain L-threo-β-hydroxy histidine in their peptide chains, an amino acid sofar encountered in nature only rarely. The co-occurence of the same pyoverdine in different Pseudom onas species and its significance for the classification is discussed.