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Adaptation of Cupriavidus metallidurans CH34 to toxic zinc concentrations involves an uncharacterized ABC-type transporter

ABSTRACT: Adaptation of Cupriavidus metallidurans CH34 to toxic zinc concentrations involves an uncharacterized ABC-type transporter

PROVIDER: PRJNA659286 | ENA |

REPOSITORIES: ENA

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Adaptation of Cupriavidus metallidurans CH34 to toxic zinc concentrations involves an uncharacterized ABC-type transporter

Project description:Cupriavidus metallidurans CH34 is a well-studied metal-resistant β-proteobacterium and contains a battery of genes involved in the resistance and processing of numerous metals. Here, we performed a directed evolution experiment to obtain derivatives adapted to grow in the presence of zinc at concentrations above the minimal inhibitory concentration for the parental strain. Genetic characterization of one derivative, CH34ZnR, which was also more resistant to cadmium, revealed seven mutations, including inactivation of glpR coding for a DeoR-type transcriptional repressor by insertion of IS1088. The latter resulted in the constitutive expression of the neighboring ABC-type transporter. GlpR and the adjacent ABC transporter are highly similar to the glycerol operon regulator and ATP-driven glycerol importer of Rhizobium leguminosarum bv. viciae VF39, respectively. Deletion of glpR or the ABC transporter and complementation of CH34ZnR with the parental glpR gene further demonstrated that loss of GlpR function, with concomitant induction of the adjacent ABC transporter, is pivotal in the observed phenotype. Moreover, addition of glycerol, presumably by glycerol-mediated reduced GlpR activity, also promoted increased zinc and cadmium resistance. Thus, the ABC-type transporter is proposed to be a new adaptation route during exposure to toxic zinc concentrations.

2021-03-03 | GSE156826 | GEO

Adaptation of <i>Cupriavidus metallidurans</i> CH34 to Toxic Zinc Concentrations Involves an Uncharacterized ABC-Type Transporter.

Project description:Cupriavidus metallidurans CH34 is a well-studied metal-resistant ?-proteobacterium and contains a battery of genes participating in metal metabolism and resistance. Here, we generated a mutant (CH34ZnR) adapted to high zinc concentrations in order to study how CH34 could adaptively further increase its resistance against this metal. Characterization of CH34ZnR revealed that it was also more resistant to cadmium, and that it incurred seven insertion sequence-mediated mutations. Among these, an IS1088 disruption of the glpR gene (encoding a DeoR-type transcriptional repressor) resulted in the constitutive expression of the neighboring ATP-binding cassette (ABC)-type transporter. GlpR and the adjacent ABC transporter are highly similar to the glycerol operon regulator and ATP-driven glycerol importer of Rhizobium leguminosarum bv. viciae VF39, respectively. Deletion of glpR or the ABC transporter and complementation of CH34ZnR with the parental glpR gene further demonstrated that loss of GlpR function and concomitant derepression of the adjacent ABC transporter is pivotal for the observed resistance phenotype. Importantly, addition of glycerol, presumably by glycerol-mediated attenuation of GlpR activity, also promoted increased zinc and cadmium resistance in the parental CH34 strain. Upregulation of this ABC-type transporter is therefore proposed as a new adaptation route towards metal resistance.

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Response of Cupriavidus metallidurans CH34 to different Pt-species

Project description:Response of Cupriavidus metallidurans CH34 to cisplatin, Pt(IV)chloride and Au-NP

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Response of Cupriavidus metallidurans CH34 to different Au-species

Project description:Response of Cupriavidus metallidurans CH34 to NaAuCl4, Au(I)-thiomalate, Au(I)-thiosulfate, KAuCN, (KCN as control)

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Metal resistant bacterium Cupriavidus metallidurans CH34

Project description:Metal resistant bacterium Cupriavidus metallidurans CH34 uses non-conventional proteins to combat oxidative stress Keywords: Cupriavidus metallidurans; hydrogen peroxide; oxidative stress; Two-condition experiments. Comparing samples after challenging with oxidative stress versus non-induced samples. Biological triplicate. Each array contains 3 technical replicates.

2014-09-13 | E-GEOD-24094 | biostudies-arrayexpress

Proteomic Response of Cupriavidus metallidurans CH34 to gold stress

Project description:Proteomic response of Cupriavidus metallidurans CH34 to gold stress as in comparison to copper stress and control. Please note that 25Au in gel file names is a typo and should read 50Au.

2016-10-26 | PXD005034 | Pride

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