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Escherichia coli BW25113

ABSTRACT: Escherichia coli BW25113 Genome sequencing

PROVIDER: PRJNA234028 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1107550.fastq.gz	Fastqsanger.gz
	SRR1107560.fastq.gz	Fastqsanger.gz
	SRR1107570.fastq.gz	Fastqsanger.gz
	SRR1107580.fastq.gz	Fastqsanger.gz
	SRR1107590.fastq.gz	Fastqsanger.gz

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Escherichia coli BW25113

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E. coli BW25113 frdC vs. E. coli BW25113 HW2

Project description:Glycerol is an attractive feedstock for biofuels since it accumulates as a byproduct during biodiesel operations; hence, it is interesting to consider converting glycerol to hydrogen using the formate hydrogen lyase system of Escherichia coli which converts pyruvate to hydrogen. Starting with Escherichia coli BW25113 frdC that lacks fumarate reductase to eliminate the negative effect of accumulated hydrogen on glycerol fermentation and by using both adaptive evolution and chemical mutagenesis combined with a selection method based on increased growth on glycerol, we obtained an improved strain, HW2, that produces 20-fold more hydrogen in glycerol medium (0.68 mmol/L/h) compared to that of frdC mutant. HW2 also grows 5-fold faster (0.25 1/h) than BW25113 frdC on glycerol, so it achieves a reasonable growth rate. Corroborating the increase in hydrogen production, glycerol dehydrogenase activity in HW2 increased 4-fold compared to BW25113 frdC. In addition, a whole-transcriptome study revealed that several pathways that would decrease hydrogen yields were repressed in HW2 (fbp, focA, and gatYZ) while a beneficial pathway, eno which encodes enolase was induced.

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Transcriptional responses of Escherichia coli rpoS- BW25113 vs. wild-type BW25113 under 15% ethanol shock in log phase

Project description:RpoS, an alternative sigma factor, is critical for stress response in Escherichia coli.RpoS also acts as a global regulator for stress control of gene expression, and actually dose so in log stage and stationary stage. To further understand the effect of environmental stresses on in ethanologenic strains, DNA microarrys was used to analyze the expression profiles of E. coli and its rpoS mutant strain. BW25113（rpoS-）and BW25113 were selected at log stages and stationary stage of early development for RNA extraction and hybridization on Affymetrix microarrays. To that end, we hand-selected BW25113 and BW25113（rpoS-） according at different treatments: BW25113（rpoS-）at log stage (BW25113(rpoS-) log), BW25113 at log stage (BW25113 log),BW25113（rpoS-）atstationary stage ( BW25113(rpoS-) stationary), BW25113 at stationary stage ( BW25113 stationary)

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Microarray analysis of RNase I-deficient Escherichia coli versus wild-type BW25113

Project description:The present study investigated the role(s) of RNase I (encoded by the rna gene) in Escherichia coli by comparative gene expression analysis of an rna mutant and the isogenic wild-type E. coli strain BW25113. The transcriptomic analysis aims to provide mechanistic insight into aberrant phenotypes observed in the RNase I-deficient mutant.

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