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Transcriptome signatures of class I and III stress response deregulation in Lactobacillus plantarum reveal pleiotropic adaptation.
Van Bokhorst-van de Veen, Hermien; Bongers, Roger S; Wels, Michiel; Bron, Peter A; Kleerebezem, Michiel.
Afiliação
  • Kleerebezem M; TI Food & Nutrition, Nieuwe Kanaal 9A, 6709 PA Wageningen, The Netherlands. Michiel.Kleerebezem@nizo.com.
Microb Cell Fact ; 12: 112, 2013 Nov 18.
Article em En | MEDLINE | ID: mdl-24238744
ABSTRACT

BACKGROUND:

To cope with environmental challenges bacteria possess sophisticated defense mechanisms that involve stress-induced adaptive responses. The canonical stress regulators CtsR and HrcA play a central role in the adaptations to a plethora of stresses in a variety of organisms. Here, we determined the CtsR and HrcA regulons of the lactic acid bacterium Lactobacillus plantarum WCFS1 grown under reference (28°C) and elevated (40°C) temperatures, using ctsR, hrcA, and ctsR-hrcA deletion mutants.

RESULTS:

While the maximum specific growth rates of the mutants and the parental strain were similar at both temperatures (0.33 ± 0.02 h(-1) and 0.34 ± 0.03 h(-1), respectively), DNA microarray analyses revealed that the CtsR or HrcA deficient strains displayed altered transcription patterns of genes encoding functions involved in transport and binding of sugars and other compounds, primary metabolism, transcription regulation, capsular polysaccharide biosynthesis, as well as fatty acid metabolism. These transcriptional signatures enabled the refinement of the gene repertoire that is directly or indirectly controlled by CtsR and HrcA of L. plantarum. Deletion of both regulators, elicited transcriptional changes of a large variety of additional genes in a temperature-dependent manner, including genes encoding functions involved in cell-envelope remodeling. Moreover, phenotypic assays revealed that both transcription regulators contribute to regulation of resistance to hydrogen peroxide stress. The integration of these results allowed the reconstruction of CtsR and HrcA regulatory networks in L. plantarum, highlighting the significant intertwinement of class I and III stress regulons.

CONCLUSIONS:

Taken together, our results enabled the refinement of the CtsR and HrcA regulatory networks in L. plantarum, illustrating the complex nature of adaptive stress responses in this bacterium.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Proteínas de Bactérias / Lactobacillus plantarum / Pleiotropia Genética / Transcriptoma Idioma: En Revista: Microb Cell Fact Assunto da revista: BIOTECNOLOGIA / MICROBIOLOGIA Ano de publicação: 2013 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Proteínas de Bactérias / Lactobacillus plantarum / Pleiotropia Genética / Transcriptoma Idioma: En Revista: Microb Cell Fact Assunto da revista: BIOTECNOLOGIA / MICROBIOLOGIA Ano de publicação: 2013 Tipo de documento: Article