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In Vivo and in Vitro Investigation of Transcriptional Regulation by DntR
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
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2007 In: Journal of Molecular Biology, ISSN 0022-2836, Vol. 372, no 3, 571-582 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2007. Vol. 372, no 3, 571-582 p.
Identifiers
URN: urn:nbn:se:su:diva-24456OAI: oai:DiVA.org:su-24456DiVA: diva2:197558
Note
Part of urn:nbn:se:su:diva-7052Available from: 2007-09-12 Created: 2007-09-05Bibliographically approved
In thesis
1. Adaptive Responses by Transcriptional Regulators to small molecules in Prokaryotes: Structural studies of two bacterial one-component signal transduction systems DntR and HpNikR
Open this publication in new window or tab >>Adaptive Responses by Transcriptional Regulators to small molecules in Prokaryotes: Structural studies of two bacterial one-component signal transduction systems DntR and HpNikR
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Prokaryotes are continually exposed to variations in their environment. Survival in unstable milieu requires a wide range of transcriptional regulators (TRs) that respond to specific environmental and cellular signals by modulating gene expression and provide an appropriate physiological response to external stimuli. These adaptive responses to environmental signals are mostly mediated by TRs from one of two families: the single or the two component signal transduction systems (1CSTS; 2CSTS). In this thesis the structural analysis of two 1CSTS – DntR and NikR − are presented. One study was carried out to try to develop a bacterial biosensor for synthetic dinitrotulenes compounds, the other to characterise the Ni-sensing mechanism that contributes to the acid adaptation of the human pathogen Helicobacter pylori. DntR belongs to the LysR family and the crystal structures obtained have allowed the proposal a model of the interaction of DntR with salicylate inducer as well as giving insights into the signal propagation mechanism in LysR-type transcription factors (paper I). DntR mutant crystal structures combined with the modelling of DntR-2,4-dnt interactions led to the design of a DntR mutant that has a limited response to 2,4-dnt in a whole cell biosensor system (paper 2). Crystal structures of apo-NikR from H. pylori (HpNikR) and of Ni-bound intermediary states of the protein were obtained. The latter have helped in unravelling the Ni incorporation and selectivity mechanisms of NikRs and have shown a strong cooperativity between conformational changes in the Ni binding domain with movements of the DNA binding domain (paper 3). Biochemical studies and comparisons of the HpNikR crystal structures with those of NikR homologues strongly suggest that HpNikR has evolved different surface properties (paper 4) and a new mode of DNA binding.

Place, publisher, year, edition, pages
Stockholm: Institutionen för biokemi och biofysik, 2007. 91 p.
Keyword
transcription regulator, bacterial biosensor, LysR family, Inducer-binding, nickel-sensing, NikR, signal transduction system, Helicobacter pylori
National Category
Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)
Research subject
Biochemistry
Identifiers
urn:nbn:se:su:diva-7052 (URN)978-91-7155-500-7 (ISBN)
Public defence
2007-10-03, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 13:30
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Supervisors
Available from: 2007-09-12 Created: 2007-09-05Bibliographically approved

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