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Synechocystis sp. PCC 6803 strain:GT-I, PCC-N, PCC-P

ABSTRACT: Synechocystis sp. PCC 6803 Genome sequencing project

PROVIDER: PRJDA68267 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	DRR001142_1.fastq.gz	Fastqsanger.gz
	DRR001142_2.fastq.gz	Fastqsanger.gz
	DRR001143_1.fastq.gz	Fastqsanger.gz
	DRR001143_2.fastq.gz	Fastqsanger.gz
	DRR001144_1.fastq.gz	Fastqsanger.gz

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RNAseq Analysis of Artificial Genome Relaxation in Synechocystis sp. PCC 6803

Project description:In cyanobacteria DNA supercoiling varies over the diurnal light/dark cycle and is integrated with temporal programs of transcription and replication. We manipulated DNA supercoiling in Synechocystis sp. PCC 6803 by CRISPRi-based knockdown of gyrase subunits gyrA, gyrB and overexpression of topoisomerase I (TopoI) topA and analyzed the transcriptional response to gyrase knock-downs (endpoint in triplicate) and topoisomerase I overexpression (endpoint in triplicate, and 19 time points time series before and after induction) in Synechocystis sp. PCC 6803 via RNA-seq of coding RNA. In detail, Illumina Ribo-Zero Plus rRNA Depletion Kit was used to remove the ribosomal RNA molecules from the isolated total RNA. Removal of rRNA was evaluated with the RNA Pico 6000 kit on the Agilent 2100 Bioanalyzer. RNA was free of detectable rRNA. Preparation of cDNA libraries was performed according to the manufacturer’s instructions for the TruSeq stranded mRNA kit (Illumina, San Diego, CA, United States). Subsequently, each cDNA library was sequenced on an Illumina NextSeq 500 system (2 x 75 nt PE high output v2.5).

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Synechocystis sp. PCC 6803 substr. GT-I

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The role of the Synechocystis sp. PCC 6803 homolog of the circadian clock output regulator RpaA in day-night transitions

Project description:Like many other organisms, cyanobacteria exhibit rhythmic gene expression with a period length of 24 hours to adapt to daily environmental changes. In the model organism Synechococcus elongatus PCC 7942 the central oscillator consists of three proteins: KaiA, KaiB and KaiC and utilizes the histidine kinase SasA and its response regulator RpaA as output-signaling pathway. Synechocystis sp. PCC 6803 contains two additional homologs of the kaiB and kaiC genes. Here we demonstrate that RpaA interacts with the core oscillator KaiAB1C1 of Synechocystis sp. PCC 6803 via SasA, similar to Synechococcus elongatus PCC 7942. However, interaction with the additional Kai homologs was not detected, suggesting different signal transduction components for the clock homologs. Inactivation of rpaA in Synechocystis sp. PCC 6803, lead to reduced viability of the mutant in light-dark cycles that aggravated under mixotrophic growth conditions. Chemoheterotrophic growth in the dark was abolished completely. In accordance, transcriptomic data revealed that RpaA is involved in the regulation of genes related to CO2‑acclimation and carbon metabolism under diurnal light conditions. Further, our results indicate that RpaA functions in the posttranslational regulation of glycogen metabolism as well, and a potential link between the circadian clock and motility was identified.

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Project description:Several strains with increased high light tolerance were previously generated by adaptive laboratory evolution from Synechocystis sp. PCC 6803 WT strain. The high light tolerance in each strain was caused by a few non-synonymous point mutations. Reintroduction of the corresponding point mutation in WT conferred enhanced tolerance to high light. Here, we characterized the responses at the transcriptional level using RNA-Seq approach to identify genes associated with the HL tolerance.

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