GNPS - Cyanobacteria Pteridines purified from Synechococcus elongatus PCC 7942 extracts
Ontology highlight
ABSTRACT:
INSTRUMENT(S): Q Exactive HF
ORGANISM(S): Synechococcus Elongatus Pcc 7942
SUBMITTER: 
Danie Petras
PROVIDER: MSV000094885 | GNPS | Tue May 28 15:59:00 BST 2024
REPOSITORIES: GNPS
Similar Datasets
Project description:Different pteridines were purified from cyanobacterial cell extract (Synechococcus elongatus PCC 7942) via HPLC
2024-05-28 | MSV000094885 | MassIVE
Project description:Previous molecular and mechanistic studies have identified several principles of prokaryotic transcription, but less is known about the global transcriptional architecture of bacterial genomes. Here we perform a comprehensive study of a cyanobacterial transcriptome, that of Synechococcus elongatus PCC 7942, generated by combining three high-resolution data sets: RNA sequencing, tiling expression microarrays, and RNA polymerase chromatin immunoprecipitation (ChIP) sequencing. We report absolute transcript levels, operon identification, and high-resolution mapping of 5' and 3' ends of transcripts. We identify several interesting features at promoters, within transcripts and in terminators relating to transcription initiation, elongation, and termination. Furthermore, we identify many putative non-coding transcripts. We provide a global analysis of a cyanobacterial transcriptome. Our results uncover insights that reinforce and extend the current views of bacterial transcription. RNA Sequencing of the cyanobacterium Synechococcus elongatus PCC 7942 RNA polymerase ChIP Sequencing of the cyanobacterium Synechococcus elongatus PCC 7942 Tiling Microarray of the cyanobacterium Synechococcus elongatus PCC 7942
2011-05-16 | E-GEOD-29264 | biostudies-arrayexpress
Project description:An excess of reactive oxygen species (ROS) can cause severe oxidative damage to cellular components in photosynthetic cells. Antioxidant systems, such as the ascorbate-glutathione cycle, regulate redox status in cells to guard against such damage. Dehydroascorbate reductase (DHAR, EC 1.8.5.1) catalyzes the glutathione-dependent reduction of oxidized ascorbate (dehydroascorbate) and contains a redox active site and glutathione binding-site. The DHAR gene is important in biological and abiotic stress responses involving reduction of the oxidative damage caused by ROS. In this study, a transgenic microalgae (TA) strain was constructed by cloning the Oryza sativa L. japonica DHAR (OsDHAR) gene controlled by an isopropyl β-D-1-thiogalactopyranoside (IPTG)-inducible promoter (Ptrc) into the Synechococcus elongatus PCC 7942 strain of cyanobacteria to study the functional activities of OsDHAR under oxidative stress caused by hydrogen peroxide exposure. OsDHAR expression increased the growth of S. elongatus PCC 7942 under oxidative stress by reducing the levels of hydroperoxides and malondialdehyde (MDA) and mitigating the loss of chlorophyll. DHAR and glutathione S-transferase activity were higher than in the wild-type (WT) strain. Additionally, overexpression of OsDHAR in S. elongatus PCC 7942 greatly increased the glutathione (GSH)/glutathione disulfide (GSSG) ratio compared to ascorbic acid (AsA)/dehydroascorbate (DHA) ratio in the presence or absence of hydrogen peroxide. These results strongly suggest that DHAR attenuates deleterious oxidative effects via the glutathione (GSH)-dependent antioxidant system in cyanobacterial cells. The expression of heterologous OsDHAR in S. elongatus PCC 7942 protected cells from oxidative damage through a GSH-dependent antioxidant system via GSH-dependent reactions at the redox active site and GSH binding site residues during oxidative stress.
2019-11-25 | GSE140121 | GEO
Project description:In the unicellular cyanobacterium, Synechococcus elongatus PCC 7942, essentially all promoter activities are under the control of the circadian clock in continuous light (LL) conditions. Here, we employed high-density oligonucleotide arrays to investigate comprehensive profiles of genome-wide Synechococcus gene expression in kaiA-overexpressor (Ptrc::[GTG]kaiA) strains under LL. KaiC has been proposed to globally activate gene expression, our analysis revealed that dawn expressing genes were downregulated by kaiA-overexpression, such that the clock was arrested at subjective dawn. IPTG-inducible kaiA-overexpressor (oxA) S. elongatus PCC 7942 strains were analyzed under continuous light (LL) using Affymetrix high-density oligonucleotide microarrays (GeneChip CustomExpress Arrays) representing predicted 2,515 protein-coding genes on the genome of Synechococcus elongatus PCC 6301, which can be used also to the almost homologous strain, S. elongatus PCC 7942: a single experiment in oxA under LL in the presence or absence of an inducer, IPTG, from hour 24 to 48 in LL timecourse data (24~48 hours under continuous light) from Synechococcus elongatus PCC 7942 (inducible kaiA-overexpressor) strains
2013-12-31 | E-GEOD-47015 | biostudies-arrayexpress
Project description:In order to explore the effect of introducing the ectoine synthesis module in Synechococcus elongatus PCC 7942 on the global regulation of the strain under high-salt environment. The ectoine synthesis module was introduced at the Synpcc7942_0808 locus to obtain the Syn7942/Δsps-ect strain that lacked sucrose synthesis and could synthesize ectoine. Comparative transcriptomic analysis was performed on WT and Syn7942/Δsps-ect under 0 mM and 300 mM NaCl conditions.
2023-01-08 | GSE222067 | GEO
Project description:In the unicellular cyanobacterium, Synechococcus elongatus PCC 7942, essentially all promoter activities are under the control of the circadian clock in continuous light (LL) conditions. Here, we employed high-density oligonucleotide arrays to investigate comprehensive profiles of genome-wide Synechococcus gene expression in the kaiCEE mutant strains in which the KaiC phosphorylation cycling is abolished under LL.. In the kaiCEE mutant strain more than 23% of transcripts significantly oscillated with a period of about 48 h. 409 cyclic genes were shared with the wild type strains. kaiCEE mutant strain was analyzed under continuous light (LL) using Affymetrix high-density oligonucleotide microarrays (GeneChip CustomExpress Arrays) representing predicted 2,515 protein-coding genes on the genome of Synechococcus elongatus PCC 6301, which can be used also to the almost homologous strain, S. elongatus PCC 7942: a single experiment in kaiCEE mutant under LL from hour 8 to 96 in LL timecourse data (8~96 hours under continuous light) from Synechococcus elongatus PCC 7942 (kaiCEE mutant) strains
2013-11-28 | E-GEOD-48901 | biostudies-arrayexpress
Project description:In the unicellular cyanobacterium, Synechococcus elongatus PCC 7942, most of genes are downregulated in the dark, while 10% of genes are upregulated. Here, we employed high-density oligonucleotide arrays to explore comprehensive profiles of genome-wide Synechococcus gene expression in wild type and kaiABC-null strains under continuous dark (DD) conditions. We found that expression profile of a subset of genes on the genome in DD was dramatically affected by kaiABC-nullification, and the magnitude of dark-induction was dependent on time when cells were transferred from light to DD Keywords: timecourse data (0-12 h) under continuous darkness after dark:light cycles from Synechococcus elongatus PCC 7942 wild type and kaiABC-null strains Wild type (WT) and kaiABC-null (DkaiABC) S. elongatus PCC 7942 strains were analyzed under continuous dark (DD) conditions after two 12h:12h light:dark (LD) cycles using Affymetrix high-density oligonucleotide microarrays (GeneChip CustomExpress Arrays) representing predicted 2,515 protein-coding genes on the genome of Synechococcus elongatus PCC 6301, which can be used also to the almost homologous strain, S. elongatus PCC 7942: Two independent experiments in WT and Dkai strains under DD (hours 0, 0.5, 1, 2, 4, 8 and 12).
2011-09-29 | E-GEOD-22468 | biostudies-arrayexpress
Project description:Synechococcus elongatus PCC 7942 Raw sequence reads
| PRJNA1114875 | ENA
Project description:FROG and miniFROG Reports for the organism Synechococcus elongatus PCC 7942.
These models originate from BiGG Models Database: A Database of Genome-Scale Metabolic Models (http://bigg.ucsd.edu/). Copyright © 2019 The Regents of the University of California
To cite BiGG Models Database, please use: King ZA, Lu JS, Dräger A, Miller PC, Federowicz S, Lerman JA, Ebrahim A, Palsson BO, and Lewis NE. BiGG Models: A platform for integrating, standardizing, and sharing genome-scale models (2016) Nucleic Acids Research 44(D1):D515-D522. doi:10.1093/nar/gkv1049
2024-10-15 | MODEL2408040006 | BioModels
Project description:In the unicellular cyanobacterium, Synechococcus elongatus PCC 7942, most genes show rhythmic expression controlled by the Kai-based clock under continuous light conditions (LL). We found that rpoD6-null mutants impaired expression of clock-controlled genes peaking at hours 8-10 in LL, while sasA-null or rpaA-null mutants each arrested the expression profiles at subjective dawn. Time-course data (0-24 h) of wild type (WT), rpoD6-null, sasA-null and rpaA-null S. elongatus PCC 7942 strains analyzed under continuous light (LL) conditions after two 12h:12h light:dark (LD) cycles using Affymetrix high-density oligonucleotide microarrays (GeneChip CustomExpress Arrays) representing 2,515 predicted protein-coding genes on the genome of Synechococcus elongatus PCC 6301, which can be used also for the almost homologous strain, S. elongatus PCC 7942.
2012-03-01 | E-GEOD-28430 | biostudies-arrayexpress