The ECF σ factor RpoI of R. leguminosarum initiates transcription of the vbsGSO and vbsADL siderophore biosynthetic genes in vitro

Yeoman, Kay H., Mitelheiser, Sylvain, Sawers, Gary and Johnston, Andrew W. B. (2003) The ECF σ factor RpoI of R. leguminosarum initiates transcription of the vbsGSO and vbsADL siderophore biosynthetic genes in vitro. FEMS Microbiology Letters, 223 (2). pp. 239-244. ISSN 0378-1097

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Abstract

When complexed with Escherichia coli RNA polymerase core enzyme, purified RpoI protein of Rhizobium leguminosarum initiated transcription in vitro from promoters of the vbsADL and vbsGSO operons, which are needed to synthesise the siderophore vicibactin. There is a single transcription initiation site for rpoI, regardless of whether the cells are grown in Fe-replete or Fe-depleted media, but levels of rpoI mRNA were reduced, though not abolished, in the presence of Fe. Unlike PvdS, a similar Pseudomonas s factor needed to transcribe genes involved in pyoverdine synthesis, RpoI transcribes vbsADL and vbsGSO in the absence of the cognate siderophore. The RpoI s factor is not required for transcription of rpoI. © 2003 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: gene regulation,iron uptake,rhizobium,siderophore,σ factor
Faculty \ School: Faculty of Science > School of Biological Sciences

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Depositing User: EPrints Services
Date Deposited: 01 Oct 2010 13:37
Last Modified: 21 Apr 2020 20:39
URI: https://ueaeprints.uea.ac.uk/id/eprint/643
DOI: 10.1016/S0378-1097(03)00386-0

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