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Anableps anableps isolate:Para

ABSTRACT: Anableps anableps isolate:Para Raw sequence reads

PROVIDER: PRJNA369037 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR5208974.fastq.gz	Fastqsanger.gz
	SRR5208974_1.fastq.gz	Fastqsanger.gz
	SRR5208974_2.fastq.gz	Fastqsanger.gz
	SRR5209719_1.fastq.gz	Fastqsanger.gz
	SRR5209719_2.fastq.gz	Fastqsanger.gz

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Effect of Smc and interaction with ParA on ParB binding to DNA in Pseudomonas aeruginosa

Project description:In the majority of bacterial species, the tripartite ParAB-parS system, composed of an ATPase (ParA), a DNA-binding protein (ParB), and its target parS sequence(s), assists in the chromosome partitioning. ParB forms large nucleoprotein complexes at parS(s), located in the vicinity of oriC, which after replication are subsequently relocated by ParA to polar positions. It was shown that ParB-parS complexes are loading platforms for structural maintenance of chromosome (Smc) proteins, which juxtapose the two arms of the circular chromosome. In this work, we characterized the Pseudomonas aeruginosa ParB interactions with DNA in the absence of Smc and interaction with the cognate ParA using chromatin immunoprecipitation-sequencing (ChIPseq). We show that in strains lacking Smc or strains with disturbed ParB-ParA interactions (ParA L84K or ParB G11A mutations) ParB is able to bind and spread around parS1-4 cluster and still binds to half-parS sites. Comparison of the ratio between the number of ChIP-seq reads mapping to region around parS1-4 with those mapping to ChIPseq peaks containing half-parSs indicate no major effect of the twod factors on the extent of ParB spreading, thus suggesting that the mechanisms controlling ParB association with the DNA do not involve interaction with cognate ParA partner and Smc.

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Project description:SMC complexes, loaded at ParB-parS sites, are key mediators of chromosome organization in bacteria. ParA/Soj proteins interact with ParB/Spo0J in a pathway involving ATP-dependent dimerization and DNA binding, leading to chromosome segregation and SMC loading. In Bacillus subtilis, ParA/Soj also regulates DNA replication initiation, and along with ParB/Spo0J is involved in cell cycle changes during endospore formation. The first morphological stage in sporulation is the formation of an elongated chromosome structure called an axial filament. We now show that a major redistribution of SMC complexes drives axial filament formation, in a process regulated by ParA/Soj. Unexpectedly, this regulation is dependent on monomeric forms of ParA/Soj that cannot bind DNA or hydrolyse ATP. These results reveal a new role for ParA/Soj proteins in the regulation of SMC dynamics in bacteria, and yet further complexity in the web of interactions involving chromosome replication, segregation, and organization, controlled by ParAB and SMC.

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