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ABSTRACT: Operation Performance and Microbial Analysis of Phosphorus Minerals Guiding Chromium(VI)-bioreduction in Continuous Flow Experiment

PROVIDER: PRJNA627836 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR11626786_1.fastq.gz	Fastqsanger.gz
	SRR11626786_2.fastq.gz	Fastqsanger.gz
	SRR11626787_1.fastq.gz	Fastqsanger.gz
	SRR11626787_2.fastq.gz	Fastqsanger.gz
	SRR11626788_1.fastq.gz	Fastqsanger.gz

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Project description:Hexavalent chromium (Cr(VI)) is a highly toxic contaminant, some bacteria are able to transform it to less toxic and less soluble trivalent chromium (Cr(III)). Klebsiella sp. strain AqSCr, isolated from Cr(VI)-polluted groundwater, reduces Cr(VI) both aerobically and anaerobically, and resists up 35 mM of Cr(VI); Subculturing of AqSCr in the presence of Cr(VI) conduces to adaptation. In this study, we performed RNA-Seq of Cr(VI) adapted stage, finding 255 genes upregulated and 240 downregulated with respect to controls without Cr(VI). Genes differentially expressed are mostly associated with oxidative stress response, DNA repair and replication, sulfur starvation response, envelope-osmotic stress response, fatty acid metabolism, ribosomal subunits and energy metabolism. Among them, genes not previously associated with chromium resistance as cybB, encoding a putative superoxide oxidase, gltA2, encoding an alternative citrate synthase, and des, encoding a fatty acid desaturase were upregulated. The alternative sigma factors fecl, rpoE and rpoS were upredgulated in Cr(VI) adapted cells, then they participate in orchestate the Cr(VI)-resistance mechanisms in AqSCr strain

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