1887

Abstract

The siderophore pyochelin of promotes growth under iron limitation and induces the expression of its biosynthesis genes via the transcriptional AraC/XylS-type regulator PchR. strain CHA0 makes the optical antipode of pyochelin termed enantio-pyochelin, which also promotes growth and induces the expression of its biosynthesis genes when iron is scarce. Growth promotion and signalling by pyochelin and enantio-pyochelin are highly stereospecific and are known to involve the pyochelin and enantio-pyochelin outer-membrane receptors FptA and FetA, respectively. Here we show that stereospecificity in signalling is also based on the stereospecificity of the homologous PchR proteins of and towards their respective siderophore effectors. We found that PchR functioned in the heterologous species only if supplied with its native ligand and that the FptA and FetA receptors enhanced the efficiency of signalling. By constructing and expressing hybrid and truncated PchR regulators we showed that the weakly conserved N-terminal domain of PchR is responsible for siderophore specificity. Thus, both uptake and transcriptional regulation confer stereospecificity to pyochelin and enantio-pyochelin biosynthesis.

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2010-06-01
2020-01-21
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Ability of wild-type and hybrid genes to restore siderophore production in pyoverdine-negative pchR mutants of and [ PDF] (153 kb) Oligonucleotides [ PDF] (39 kb)

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Ability of wild-type and hybrid genes to restore siderophore production in pyoverdine-negative pchR mutants of and [ PDF] (153 kb) Oligonucleotides [ PDF] (39 kb)

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