Transcriptional regulation of the glucose-6-phosphate transporter 2
Ontology highlight
ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE132626 | GEO | 2019/06/13
REPOSITORIES: GEO
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Project description:Regulation of CO2 fixation in cyanobacteria is important both for the organism and the global carbon balance. Here we show that phosphoketolase in Synechococcus elongatus PCC7942 (SeXPK) possesses a distinct ATP sensing mechanism, which upon ATP drops, allows SeXPK to divert precursors of the RuBisCO substrate away from the Calvin-Benson-Bassham (CBB) cycle. Deleting the SeXPK gene increased CO2 fixation particularly during light-dark transitions. In high-density cultures, the xpk strain showed a 60% increase in carbon fixation, and unexpectedly resulted in sucrose secretion without any pathway engineering. Using cryo-EM analysis, we discovered that these functions were enabled by a unique allosteric regulatory site involving two subunits jointly binding two ATP, which constantly suppresses the activity of SeXPK until the ATP level drops. This magnesium-independent ATP allosteric site is present in many species across all three domains of life, where it may also play important regulatory functions.
2023-08-08 | GSE227397 | GEO
Project description:Acclimation to low CO2 conditions in cyanobacteria involves the coordinated regulation of genes mainly encoding components of the carbon concentration mechanism (CCM). Making use of several independent microarray datasets a core set of CO2-regulated genes was defined for the model strain Synechocystis sp. PCC 6803. On the transcriptional level, the CCM is mainly regulated by the well-characterized transcriptional regulators NdhR and CmpR, whereas the role of an additional regulatory protein, namely cyAbrB2 belonging to the widely distributed AbrB regulator family that was originally characterized in the genus Bacillus, is less defined. Here we present results of transcript profiling of the wild type and a ΔcyabrB2 mutant of Synechocystis sp. PCC 6803 after shifts from high CO2 (5% in air, HC) to low CO2 (0.04%, LC). Evaluation of the transcriptomic data revealed that cyAbrB2 is involved in the regulation of several CCM-related genes such as sbtA/B, ndhF3/ndhD3/cupA and cmpABCD under LC conditions, but apparently acts supplementary to the main regulators. Under HC conditions, cyAbrB2 deletion changes the expression of photosystem II subunits, light-harvesting components, and Calvin-Benson-Bassham cycle enzymes.
2016-09-19 | GSE82120 | GEO
Project description:Arabidopsis thaliana ecotypes Columbia (Col-0) (wild type: WT) was used in this study. After sterilization, the seeds were placed on Murashige and Skoog medium supplemented with 2% (w/v) sucrose for 10 days and then the seedling were transferred to soil under 16 hours light (22°C) / 8 hours dark (18°C) period in growth chamber at a light intensity of 120?150 µmol m-2 s-1. 20-day-old Arabidopsis leaves without bolting were immediately frozen in liquid nitrogen for RNA and protein and metabolites extraction. Leaves were harvested at three different time points: t = 0 hr (end of night), t = 1 hr (one hour after light turn on) and t = 8 hr (eight hours after light turn on), respectively.
2016-01-20 | GSE57791 | GEO
Project description:Arabidopsis thaliana ecotypes Columbia (overexpression line) was used in this study. After sterilization, the seeds were placed on Murashige and Skoog medium supplemented with 2% (w/v) sucrose for 10 days and then the seedling were transferred to soil under 16 hours light (22°C) / 8 hours dark (18°C) period in growth chamber at a light intensity of 120?150 µmol m-2 s-1. 20-day-old Arabidopsis leaves without bolting were immediately frozen in liquid nitrogen for RNA and protein and metabolites extraction. Leaves were harvested at three different time points: t = 0 hr (end of night), t = 1 hr (one hour after light turn on) and t = 8 hr (eight hours after light turn on), respectively.
2016-01-21 | GSE57790 | GEO
Project description:Protein cysteinyl thiols are susceptible to reduction-oxidation reactions that can influence protein function, urging the need for accurate cysteine oxidation quantification to decode protein redox regulation. Here, we present a novel approach called CysQuant that enables simultaneous quantification of cysteine oxidation degrees and protein abundancies. Reduced and reversibly oxidized cysteines are differentially labeled with light and heavy iodoacetamide isotopologues and analyzed using data-dependent acquisition (DDA) or data-independent acquisition (DIA) mass spectrometry. Using in silico predicted spectral libraries, plexDIA quantified on average 18% oxidized in the model plant Arabidopsis thaliana, though revealed a subset of highly oxidized cysteines part of disulfide bridges in AlphaFold2 predicted protein structures. Studying protein redox regulation of plant seedlings in response to excessive light, CysQuant successfully identified the well-established increased reduction of Calvin-Benson cycle enzymes, in addition to discovery of other, yet uncharacterized redox-sensitive disulfides in plastidial enzymes. CysQuant is widely applicable to diverse mass spectrometry platforms studying the cysteine modification status.
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Project description:Atmospheric CO2 concentrations can determine the number of stomata that form on plant leaves (Woodward & Kelly 1995 New Phyt 131: 311-327). The majority of species exhibit reduced stomatal densities at elevated CO2. However, not all plant species react in the same way to elevated CO2 levels and there is a spectrum of effects: Some species increase stomatal densities, some decrease stomatal densities, and some are unaffected. In addition to which, other environmental factors influence the number of stomata that a plant form. Light intensity has also been shown to affect stomatal numbers in various Arabidopsis ecotypes (Schluter et al. 2003 J Exp Bot 54 (383): 867-874; Lake et al. 2002 J Exp Bot 53 (367): 183-193), by increasing stomatal numbers with increasing light levels. There are many changes in gene expression under elevated CO2 conditions, so pinpointing specific genes involved in the stomatal response to CO2 is difficult. In addition, if there is crosstalk between the various signalling pathways affecting ultimate stomatal numbers this complicates further the task of finding genes specifically involved the stomatal response to CO2. Therefore we propose to look at the interaction of two known influences on stomatal numbers, light and CO2, on one specific ecotype, Col-0. We aim to test the hypothesis that light signals interact the CO2 signals that affect stomatal development. Arabidopsis thaliana Columbia-0 ecotype has previously been shown to decrease stomatal numbers in response to a doubling of ambient CO2 concentrations. Col-0 has also been shown to increase stomatal numbers in response to high light intensities. Therefore we propose to grow A. thaliana Col-0 at three light intensities (50 mmol m-2 s-1, 150 mmol m-2 s-1 and 250 mmol m-2 s-1), in both ambient and elevated (double ambient) atmospheric CO2 concentrations. By looking in more detail at how gene expression differs between plants grown at ambient and elevated CO2 at the same light intensities, and also how gene expression differs between plants grown at the same CO2 concentration but different light intensities, we aim to identify those genes involved in the stomatal developmental response to CO2 and whether genes involved in the light response can also be isolated.
2022-11-21 | E-NASC-11 | biostudies-arrayexpress
Project description:Atmospheric CO2 concentrations can determine the number of stomata that form on plant leaves (Woodward & Kelly 1995 New Phyt 131: 311-327). The majority of species exhibit reduced stomatal densities at elevated CO2. However, not all plant species react in the same way to elevated CO2 levels and there is a spectrum of effects: Some species increase stomatal densities, some decrease stomatal densities, and some are unaffected. In addition to which, other environmental factors influence the number of stomata that a plant form. Light intensity has also been shown to affect stomatal numbers in various Arabidopsis ecotypes (Schluter et al. 2003 J Exp Bot 54 (383): 867-874; Lake et al. 2002 J Exp Bot 53 (367): 183-193), by increasing stomatal numbers with increasing light levels. There are many changes in gene expression under elevated CO2 conditions, so pinpointing specific genes involved in the stomatal response to CO2 is difficult. In addition, if there is crosstalk between the various signalling pathways affecting ultimate stomatal numbers this complicates further the task of finding genes specifically involved the stomatal response to CO2. Therefore we propose to look at the interaction of two known influences on stomatal numbers, light and CO2, on one specific ecotype, Col-0. We aim to test the hypothesis that light signals interact the CO2 signals that affect stomatal development. Arabidopsis thaliana Columbia-0 ecotype has previously been shown to decrease stomatal numbers in response to a doubling of ambient CO2 concentrations. Col-0 has also been shown to increase stomatal numbers in response to high light intensities. Therefore we propose to grow A. thaliana Col-0 at three light intensities (50 mmol m-2 s-1, 150 mmol m-2 s-1 and 250 mmol m-2 s-1), in both ambient and elevated (double ambient) atmospheric CO2 concentrations. By looking in more detail at how gene expression differs between plants grown at ambient and elevated CO2 at the same light intensities, and also how gene expression differs between plants grown at the same CO2 concentration but different light intensities, we aim to identify those genes involved in the stomatal developmental response to CO2 and whether genes involved in the light response can also be isolated. Experimenter name = Susannah Bird Experimenter phone = (0114) 222 4649 Experimenter address = Animal and Plant Science Department Experimenter address = Alfred Denny Building Experimenter address = Western Bank Experimenter address = Sheffield Experimenter zip/postal_code = S10 2TN Experimenter country = UK Keywords: growth_condition_design
2007-01-08 | GSE5733 | GEO
Project description:This model is from the article:
A quantitative comparison of Calvin–Benson cycle models
Anne Arnold, Zoran Nikoloski
Trends in Plant Science2011 Oct 14.
22001849,
Abstract:
The Calvin-Benson cycle (CBC) provides the precursors for biomass synthesis necessary for plant growth. The dynamic behavior and yield of the CBC depend on the environmental conditions and regulation of the cellular state. Accurate quantitative models hold the promise of identifying the key determinants of the tightly regulated CBC function and their effects on the responses in future climates. We provide an integrative analysis of the largest compendium of existing models for photosynthetic processes. Based on the proposed ranking, our framework facilitates the discovery of best-performing models with regard to metabolomics data and of candidates for metabolic engineering.
Note: Model of the Calvin cycle and the related end-product pathways to starch and sucrose synthesis by Laisk et al. (2006, DOI:10.1007/s11120-006-9109-1) and the personally provided implementation to Laisk et al. (2009, DOI:10.1007/978-1-4020-9237-4_13).
A reduced version of the published model is implemented (light-dependent reactions are taken out). The parameter values are widely taken from Laisk et al. (1989, [click here for PDF]). The initial metabolite values are chosen from the data set of Zhu et al. (2007, DOI:10.1104/pp.107.103713). A detailed description of all modifications is given in the model described by Arnold and Nikoloski (2011, PMID:22001849.
2024-09-02 | BIOMD0000000392 | BioModels
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2021-09-08 | PXD013506 | Pride
Project description:We performed threefold evolution experiment with tobacco etch potyvirus isolate At17b (TEV-At17b) in five different ecotypes of Arabidopsis thaliana L. (Di-2, Ei-2, Ler-0, St-0, and Wt-1,), that are heterogeneous in their susceptibility to TEV-At17b infection. After the evolution phase, (i) we characterized the fitness and virulence of the evolved lineages across all host ecotypes, (ii) the molecular changes fixed in the viral genomes. Next, we analyzed the transcriptoma of the plants using Agilent Microarray tecnology (i)plants infected with local adapted viral lineage, (ii)plants infected with evolved virus vs. ancestal virus, (iii) virus evolved in new host and infecting its original host, (iv) transcriptoma of most specialized and most generalized viruses infecting all five ecotypes.
2016-04-18 | GSE66020 | GEO