A Pyoverdin from the Antarctica Strain 51W of Pseudomonas fluorescens*

From the strain 51W of Pseudom onas fluorescens living under extrem e conditions at the Schirm acher Oasis (A ntarctica) a pyoverdin was obtained. Its structure was elucidated by chemical degradation and spectroscopic methods. The NM R data of the pyoverdin and of its G a(III) complex were com pared. A ppreciable influences of the m etal on the chemical shifts of the atom s at its binding sites were observed. Thus the structural elem ents involved in the com plexation can be identified and coinciding signals of am ino acids occurring more than once in the peptide chain can be separated.