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Journal of Bacteriology, April 2006, p. 2483-2492, Vol. 188, No. 7
0021-9193/06/$08.00+0     doi:10.1128/JB.188.7.2483-2492.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Effect of Neisseria meningitidis Fur Mutations on Global Control of Gene Transcription{dagger}

Isabel Delany,1 Renata Grifantini,1 Erika Bartolini,1 Rino Rappuoli,1 and Vincenzo Scarlato1,2*

Chiron Vaccines, Via Fiorentina 1, 53100 Siena, Italy,1 Department of Biology, University of Bologna, Via Selmi 3, 40126 Bologna, Italy2

Received 26 October 2005/ Accepted 29 December 2005

The ferric uptake regulator Fur is a well-known iron-responsive repressor of gene transcription, which is used by many bacteria to respond to the low-iron environment that pathogens encounter during infection. In this study we used comparative transcriptome analysis to define the role of the Fur protein in the global control of gene transcription and iron regulation in Neisseria meningitidis. By using the Fur-null mutant and its complemented derivative, we identified 83 genes whose transcription is controlled by Fur. We report that Fur may control differential expression of these genes by binding directly to their promoters or through indirect mechanisms. In addition, mutation of the fur gene resulted in the induction of the heat shock response, and transcription of these genes does not respond to iron limitation. Furthermore, analysis of the iron starvation stimulon in the Fur-null mutant provided evidences of iron-responsive regulation that is independent of Fur. We began to dissect the regulatory networks of Fur and the heat shock (stress) response in N. meningitidis, and the observed interlink between the two circuits is discussed.

* Corresponding author. Mailing address: Molecular Immunology Unit, Chiron Vaccines, Via Fiorentina 1, 53100 Siena, Italy. Phone: 39 0577 243565. Fax: 39 0577 243564. E-mail: enzo_scarlato{at}chiron.com.

{dagger} Supplemental material for this article may be found at http://jb.asm.org/.

Journal of Bacteriology, April 2006, p. 2483-2492, Vol. 188, No. 7
0021-9193/06/$08.00+0     doi:10.1128/JB.188.7.2483-2492.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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