Dynamic synthesis and transport of phenazine-1-carboxylic acid to boost extracellular electron transfer rate
Ontology highlight
ABSTRACT:
ORGANISM(S): Shewanella oneidensis MR-1
PROVIDER: GSE289377 | GEO | 2025/02/13
REPOSITORIES: GEO
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Project description:Dynamic synthesis and transport of phenazine-1-carboxylic acid to boost extracellular electron transfer rate
| PRJNA1222813 | ENA
Project description:Pseudomonas chlororaphis strain 30-84 is an effective biological control agent against take-all disease of wheat. Phenazines, bacterial secondary metabolites produced by 30-84, are essential for 30-84 to inhibit fungal pathogens, form biofilms, and effectively colonize the rhizosphere. However, how the bacteria themselves respond to phenazines remains unknown. In this study, we conducted an RNA-seq analysis by comparing the wild type strain with a phenazine deficient mutant. RNA-seq analysis identified over 200 genes differentially regulated by phenazines. Consistent with previous findings in Pseudomonas aeruginosa PAO1, phenazines positively contribute to the expression of their own biosynthetic genes. Moreover, phenazine regulatory genes including the phzI/phzR quorum sensing system and the rpeB response regulatory were also expressed at high levels in the presence of phenazines. Besides phenazine biosynthesis and regulatory genes, genes involved in secondary metabolism, exopoysaccharide production and iron uptake as well as amino acid transport were identified as the major components under phenazine control, including many novel genes. We have also demonstrated that mutation of the primary siderophore gene pvdA resulted in up-regulation of phenazine genes when grown in iron-limiting media. These findings implicate phenazines as signaling molecules to regulate gene expression and hence alter metabolism in P. chlororaphis strain 30-84.
2014-11-25 | GSE45247 | GEO
Project description:Transcriptional profiling of A. oleivorans DR1 cells in the presence of paraquat and phenazine methosulfate
2015-06-29 | GSE70356 | GEO
Project description:Pseudomonas chlororaphis strain 30-84 is an effective biological control agent against take-all disease of wheat. Phenazines, bacterial secondary metabolites produced by 30-84, are essential for 30-84 to inhibit fungal pathogens, form biofilms, and effectively colonize the rhizosphere. However, how the bacteria themselves respond to phenazines remains unknown. In this study, we conducted an RNA-seq analysis by comparing the wild type strain with a phenazine deficient mutant. RNA-seq analysis identified over 200 genes differentially regulated by phenazines. Consistent with previous findings in Pseudomonas aeruginosa PAO1, phenazines positively contribute to the expression of their own biosynthetic genes. Moreover, phenazine regulatory genes including the phzI/phzR quorum sensing system and the rpeB response regulatory were also expressed at high levels in the presence of phenazines. Besides phenazine biosynthesis and regulatory genes, genes involved in secondary metabolism, exopoysaccharide production and iron uptake as well as amino acid transport were identified as the major components under phenazine control, including many novel genes. We have also demonstrated that mutation of the primary siderophore gene pvdA resulted in up-regulation of phenazine genes when grown in iron-limiting media. These findings implicate phenazines as signaling molecules to regulate gene expression and hence alter metabolism in P. chlororaphis strain 30-84. A total of 4 samples were analyzed in AB medium + 2% casamino acids, Pseudomonas chlororaphis wild type strain (2 replicates); Pseudomonas chlororaphis ZN mutant (2 replicates).
2014-11-25 | E-GEOD-45247 | biostudies-arrayexpress
Project description:Transcriptional profiling of A. oleivorans DR1 cells in the presence of paraquat and phenazine methosulfate To identify genes involved in oxidative stress response in A. oleivorans DR1, cells were grown to exponential phase (OD600 ~0.4) and treated with paraquat (1 mM) and phenazine methosulfate (200 μM) over a period of 15 min. Total RNA was extracted using an RNeasy Mini kit (Qiagen, USA) following the manufacturer's instructions.
2015-06-29 | E-GEOD-70356 | biostudies-arrayexpress
Project description:Our aim is to explore the effect of Hydroxy-carboxylic Acid Receptor 1 on cardiomyocytes. Neonatal rat cardiomyocytes (NRCMs) were isolated and cultured. Subsequently, NRCMs were treated with the agonist of Hydroxy-carboxylic Acid Receptor 1 (HCAR1), 3Cl-HBA at 40 μM for 48 h(HBA1,HBA2 and HBA3) or DMSO as control(C1,C3 and C3). RNA was extracted using the KAPA RiboErase RNA-Seq kit (Roche, Basel, Switzerland), and was analysed using the Agilent Bioanalyzer 2100 system (Agilent Technologies, CA, USA) for quality control. The libraries were sequenced on an Illumina HiSeq X Ten platform. DESeq2 was used to analyse RNA-seq data. Neonatal rat cardiomyocytes (NRCMs) were isolated and cultured. Subsequently, NRCMs were treated with the agonist of Hydroxy-carboxylic Acid Receptor 1 (HCAR1), 3Cl-HBA (40 μM for 48 h) or DMSO as control. RNA was extracted using the KAPA RiboErase RNA-Seq kit (Roche, Basel, Switzerland), and was analysed using the Agilent Bioanalyzer 2100 system (Agilent Technologies, CA, USA) for quality control. The libraries were sequenced on an Illumina HiSeq X Ten platform.
2024-02-14 | GSE224822 | GEO
Project description:Epoxyeicosatrienoic acids (EETs) are endogenous lipid signaling molecules with cardioprotective and vasodilatory actions. We recently showed that exogenous addition of 11,12-EET enhances hematopoietic induction and engraftment in mice and zebrafish. EETs are known to signal via a G-protein coupled receptor(s), but no specific EET receptor has been identified. Identification of an EET receptor would enable genetic interrogation of the EET signaling pathway and perhaps clinical use of this molecule. We developed a bioinformatic approach to identify the EET receptor based on the expression of GPCRs in cell lines with differential responses to EETs. We found 10 candidate EET receptors that are commonly expressed in three EET-responsive human cell lines, but not expressed in an EET-unresponsive line. Of these candidates, only GPR132 showed EET-responsiveness in vitro using a luminescence-based assay for β-arrestin recruitment. Knockdown of zebrafish gpr132b prevented EET-induced hematopoiesis, and marrow from GPR132 knockout mice showed decreased long-term engraftment capability. GPR132 has affinity for certain fatty acids in vitro, and we found that these same fatty acids enhance hematopoietic stem cell specification in the zebrafish. We conducted structure-activity relationship analyses using both in vitro and in vivo assays on diverse medium chain fatty acids. Certain oxygenated, unsaturated free fatty acids showed high activation of GPR132, while unoxygenated or saturated fatty acids had lower activity. Absence of the carboxylic acid moiety prevented activity, suggesting that this moiety is required for receptor activation. GPR132 responds to a select panel of polyunsaturated, oxygenated fatty acids to enhance both embryonic and adult hematopoiesis.
2018-08-10 | GSE113550 | GEO
Project description:To investigate how cell elongation impacts extracellular electron transfer (EET) of electroactive microorganisms (EAMs), the division of model EAM Shewanella oneidensis MR-1 was engineered by reducing the formation of cell divisome. Specially, by blocking the translation of division proteins via anti-sense RNAs or expressing division inhibitors, the cellular length and output power density were all increased. Electrophysiological and transcriptomic results synergistically revealed that the programmed cell elongation reinforced EET by enhancing NADH oxidation, inner-membrane quinone pool, and abundance of c-type cytochromes. Moreover, cell elongation enhanced hydrophobicity due to decreased cell-surface polysaccharide, thus facilitated initial surface adhesion stage in biofilm formation. The output current and power density all increased in positive correction with cellular length. However, inhibition of cell division reduced cell growth, which was then restored by quorum sensing-based dynamic regulation of cell growth and elongation phases. The QS-regulated elongated strain thus enabled a cell length of 143.6 ± 40.3 µm (72.6-fold of that of S. oneidensis MR-1), which resulted in an output power density of 248.0 ± 10.6 mW m-2 (3.41-fold of that of S. oneidensis MR-1) and exhibited superior potential for pollutant treatment. Engineering cellular length paves an innovate avenue for enhancing the EET of EAMs.
2024-09-25 | GSE244261 | GEO
Project description:Bioreactor food waste conversion to carboxylic acids Raw sequence reads
| PRJNA1111930 | ENA