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Escherichia coli O157:H7 str. Sakai

ABSTRACT: Escherichia coli O157:H7 str. Sakai Genome sequencing

PROVIDER: PRJNA171729 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR530851_1.fastq.gz	Fastqsanger.gz
	SRR530851_2.fastq.gz	Fastqsanger.gz
	SRR530855.fastq.gz	Fastqsanger.gz
	SRR530882.fastq.gz	Fastqsanger.gz
	SRR566600.fastq.gz	Fastqsanger.gz

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E. coli O157:H7 phage type 21/28 & 32 CGH analysis

Project description:Six isolates of PT21/28 and six of PT32 were analysed by CGH using UBECarray3 microarrays (containing probes for E. coli K-12 str. MG1655 and O157:H7 str. EDL933 and Sakai) to define genotypic differences between phage types. gDNA from E.coli O157 str. Sakai was hybridised to all arrays to provide a universal control channel on all arrays. gDNA from 12 PT 21/28 & 32 isolates were labelled with Cy5 and control gDNA from str. Sakai was labelled with Cy3. Test and control gDNA was hybridised to UBECarray3 microarrays. The LOWESS normalised relative signal to the Sakai control channel was used to compare between samples.

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RNA-sequencing of bicyclomycin treated Escherichia coli str. O157:H7 str. Sakai

Project description:RNA-sequencing of bicyclomycin treated Escherichia coli str. O157:H7 str. Sakai

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Transcriptional profile of pulsed AsxR in Escherichia coli O157:H7 str. TUV93-0

Project description:Transcript abundance in Escherichia coli O157:H7 was determined in the presence or absence of pulsed expression of the small RNA, AsxR. AsxR was cloned under the control the arabinose inducible promoter Para. Escherichia coli O157:H7 str. TUV93-0 with pAsxR or empty vector was cultured in MEM-HEPES media to an OD600 of 0.8 and 0.2% arabinose added. 10min after addition of arabinose 10ml of cells were harvested and and pellets resuspended in 1ml of Trizol and total RNA isolated. RNAs were labelled using the SuperScript Plus indirect cDNA labelling System. Triplicate control RNAs were pooled and hybridised to seperate AsxR test RNAs on three microarays. Arrays were hybridised using the Maui hybridisation platform and Scann using and Axon Autoloader Scanner. GenePix software was used to analyse images and GPR files were analysed using Genespring 7.3.1.

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Identification of genes regulated by gadE in E. coli O157:H7

Project description:Integrating laterally acquired virulence genes into the backbone regulatory network is important for the pathogenesis of Escherichia coli O157:H7, which has captured many virulence genes through horizontal transfer during evolution. GadE is an essential transcriptional activator of glutamate decarboxylase (GAD) system, the most efficient acid resistance mechanism in E. coli. The full contribution of GadE to the acid resistance and virulence of pathogenic E. coli O157:H7 remains largely unknown. We inactivated gadE in E. coli O157:H7 Sakai and compared global transcription profiles with that of wild type in exponential and stationary phases of growth using microarrays containing 6088 ORFs from three E. coli genomes. gadE inactivation significantly altered the expression of 60 genes independent of growth phase and 122 genes in a growth phase-dependent manner. Inactivation of gadE markedly down-regulated the expression of gadA, gadB, gadC and many acid fitness island genes in a growth phase-dependent manner. Nineteen genes encoded on the locus of enterocyte effacement (LEE), including ler, showed a significant increase in expression upon gadE inactivation. Altogether, our data indicate that GadE is critical for acid resistance of E. coli O157:H7 and plays an important role in virulence by down-regulating expression of LEE.

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Project description:Deletion of yedL was found to signifcantly decrease type three secretion in EHEC O157:H7. Transcriptional profiles of Escherichia coli O157: H7 and the isogenic yedL mutant were generated and compared.

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