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. 1988 Apr;170(4):1812–1819. doi: 10.1128/jb.170.4.1812-1819.1988

Genetic organization and transcriptional analysis of a major gene cluster involved in siderophore biosynthesis in Pseudomonas putida WCS358.

J D Marugg 1, H B Nielander 1, A J Horrevoets 1, I van Megen 1, I van Genderen 1, P J Weisbeek 1
PMCID: PMC211035  PMID: 2450869

Abstract

In iron-limited environments, the plant-growth-stimulating Pseudomonas putida WCS358 produces a yellow-green fluorescent siderophore called pseudobactin 358. The transcriptional organization and the iron-regulated expression of a major gene cluster involved in the biosynthesis and transport of pseudobactin 358 were analyzed in detail. The cluster comprises a region with a minimum length of 33.5 kilobases and contains at least five transcriptional units, of which some are relatively large. The directions of transcription of four transcriptional units were determined by RNA-RNA hybridization and by analysis in Escherichia coli minicells. The latter also demonstrated that large polypeptides were encoded by these transcriptional units. The results allowed us to localize several promoter regions on the DNA. The iron-dependent expression of at least two genes within this cluster appears to be regulated at the transcriptional level.

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Selected References

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