1887

Abstract

Conjugational mobilization of a PAO1 cosmid bank (in pMMB33) into a pyoverdine-deficient () mutant harbouring a mutation in the 47 min region of the chromosome yielded one clone which restored yellow-green pigmentation and fluorescence when grown on iron-deficient medium. The relevant pMMB33-derivative cosmid, pPYP17, contained a 15.1 kb insert which was subcloned into pKT240 as a 10.8 kb Sacl-Clal fragment conferring the same phenotype. This derivative, pPYP180, like pPYP17, also conferred an apparent wild-type phenotype on mutants previously shown to map genetically in the 23 min region of the PAO chromosome. Physical mapping indicated that the cloned DNA fragment is located at the 66-70 min region of the PAO chromosome, demonstrating that the restored apparent wild-type phenotype observed for the transconjugants was not the result of a true gene complementation. A gene interruption was obtained by replacing a 0.6 kb ll-ll region of pPYP180 necessary for the expression of the pigmentation/fluorescence phenotype, by a Hg interposon (ΩHg). After conjugational transfer and introduction of the mutagenized fragment into the PAO1 chromosome by gene replacement, pyoverdine-deficient mutants were recovered, indicating that the fragment indeed contained at least one gene involved in pyoverdine synthesis. The yellow-green fluorescent compound produced by such cells harbouring plasmids pPYP17 or pPYP180 differed from pyoverdine in several aspects and was consequently named pseudoverdine. Although pseudoverdine was able to complex iron, it was unable to restore growth to mutants in the presence of the iron chelator ethylenediamine di(o-hydroxyphenylacetic acid), or to mediate iron uptake into PAO1. Pseudoverdine lacked a peptide chain but possessed spectral properties similar to pyoverdine, suggesting that it was structurally related to the chromophore of the pyoverdine molecule. The recent structural determination of pseudoverdine as a coumarin derivative confirmed this view and sheds some light on the biosynthetic pathway of the pyoverdine chromophore.

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1996-05-01
2021-10-16
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