Pyoverdins with a Lys epsilon-amino link in the peptide chain?

For a pyoverdin isolated from Pseudomonas putida it could be shown that Lys is incorporated into the peptide chain by its epsilon-amine group in contr ast to the normally observed connection by the alpha-amino group. The struc ture elucidation of the pyoverdin by chemical degradation and spectroscopic methods is reported and the criteria-for the distinction between alpha- an d epsilon-connection in the case of Lps are discussed.