Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1209586 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR31969563_1.fastq.gz | Fastqsanger.gz | |||
| SRR31969563_2.fastq.gz | Fastqsanger.gz | |||
| SRR31969564_1.fastq.gz | Fastqsanger.gz | |||
| SRR31969564_2.fastq.gz | Fastqsanger.gz | |||
| SRR31969565_1.fastq.gz | Fastqsanger.gz |
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Project description:One-carbon (C1) feedstocks like formate could be energetically efficient substrates for sustainable microbial production of food, fuels and chemicals. Here, we replace the native energy-inefficient Calvin-Benson-Bassham (CBB) cycle in Cupriavidus necator with the more energy-efficient reductive glycine pathway for growth on formate and CO2. In chemostats, our engineered strain reaches a 17% higher biomass yield than the wild type, or any natural formatotroph using the Calvin cycle. This demonstrates the potential of synthetic metabolism to realize sustainable, bio-based production.
2025-02-15 | PXD059545 | Pride
Project description:Biological carbon fixation is foundational to the biosphere. Most autotrophs are thought to possess one carbon fixation pathway. The hydrothermal vent tubeworm Riftia pachyptila’s chemoautotrophic symbionts, however, possess two functional pathways: the Calvin Benson-Bassham (CBB) and the reductive tricarboxylic acid (rTCA) cycles. Little is known about how Riftia’s symbionts and related organisms coordinate the functioning of these two pathways. Here we investigated net carbon fixation rates, transcriptional/metabolic responses, and transcriptional co-expression patterns of Riftia pachyptila’s endosymbionts by incubating tubeworms at environmental pressures, temperature, and geochemistry. Results showed that rTCA and CBB transcriptional patterns varied in response to different geochemical regimes and that each pathway is allied to specific metabolic processes, suggesting distinctive yet complementary roles in metabolic function. Net carbon fixation rates were also exemplary, and accordingly we propose that co-activity of CBB and rTCA may be an adaptation for maintaining high carbon fixation rates, conferring a fitness advantage in dynamic vent environments.
2024-03-28 | GSE249345 | GEO
Project description:Seven carbon autotrophic fixation pathways were described so far. However, it is not common to find the co-existence of more than one cycle in a single cell. Here, we describe a thermophilic bacterium Carbonactinospora thermoautotrophica StC with a unique and versatile carbon metabolism. StC was isolated from a consortium found in a burning organic pile that exhibits an optimal growth temperature between 55° and 65° C. The genome analyses suggested that the strain StC potentially performs two-carbon fixation pathways, Calvin-Benson-Bassham (CBB) cycle and the Reductive citrate cycle (rTCA) and preserve a microcompartment related with CO2 concentration. To better understand the carbon fixation in StC strain, the expression of the genes of bacterial cells grown autotrophically and heterotrophically were analyzed. For our surprise the data showed the co-existing of the both carbon fixation pathways - CBB and rTCA cycles - in a cultivable thermophilic chemoautotrophic bacterium Carbonactinospora thermoautotrophica strain StC, based on integrated omics of genomics, transcriptomics, and proteomics. These two cycles working together may help microorganisms to improve the CO2 fixation. The knowledge about the co-occurrence of carbon cycle in a single cell leads open a question ‘why microorganisms use multiple pathways to fix carbon and what the advantage for this strategy?’. Advancing on this is a key to better understand the biological carbon fixation mechanism in thermophiles and prospecting the repurposing of enzymes in synthetic biology for biotechnological applications.
2024-04-09 | GSE263135 | GEO
Project description:These data belong to a metabolic engineering project that introduces the reductive glycine pathway for formate assimilation in Cupriavidus necator. As part of this project we performed short-term evolution of the bacterium Cupriavidus necator H16 to grow on glycine as sole carbon and energy source. Some mutations in a putiative glycine transporting systems facilitated growth, and we performed transcriptomics on the evolved strain growing on glycine. Analysis of these transcriptomic data lead us to the discovery of a glycine oxidase (DadA6), which we experimentally demonstrated to play a key role in the glycine assimilation pathay in C. necator.
2020-06-06 | GSE151887 | GEO
Project description:One carbon compounds like formate provide a promising and sustainable feedstock for microbial bioproduction of fuels and chemicals, as an alternative to the petro-chemical production industry. Growth of Escherichia coli on formate was recently achieved by introducing the reductive glycine pathway (rGlyP) into its genome, which is theoretically the most efficient aerobic formate assimilation pathway. While adaptive laboratory evolution was used to enhance the growth rate and biomass yield significantly, still the best performing formatotrophic E. coli strain did not approach the theoretical optimal biomass yield of the rGlyP. In this study, we investigated the metabolism of these previously engineered formatotrophic E. coli strains in order to elucidate why the biomass yield was sub-optimal and how it may be improved. Through a combination of metabolic modelling and proteomic analysis, we identified several potential metabolic bottlenecks and targets for expression tuning. This characterization study provides insights that can inform future rational engineering efforts to improve the growth of E. coli on formate.
2025-03-10 | PXD050315 | Pride
Project description:Replacing the Calvin cycle with the reductive glycine pathway in Cupriavidus necator
| PRJNA637590 | ENA
Project description:Metallosphaera sedula is an extremely thermoacidophilic archaeon that grows heterotrophically on peptides, and chemolithoautotrophically on hydrogen, sulfur, or reduced metals as energy sources. During autotrophic growth, carbon dioxide is incorporated into cellular carbon via the 3-hydroxypropionate /4-hydroxybutyrate cycle (3HP/4HB). To date, all of the steps in the pathway have been connected to enzymes encoded in specific ORFs, except for the one responsible for ligation of coenzyme A (CoA) to 4-hydroxybutyrate (4HB). While several candidates for this step have been identified through bioinformatic analysis of the M. sedula genome, none have been shown to catalyze this biotransformation. Transcriptomic analysis of cells grown under strict H2-CO2 autotrophy was used elucidate additional candidate genes involved in carbon fixation and identify the genes which encode for 4HB-CoA synthetase.
2013-03-05 | GSE39944 | GEO
Project description:Cyanobacteria and plants experience daily diel light/dark growth. Respiration in the dark supports survival of the photosynthetic cells by oxidizing storage compound fixed during the day. Dark respiration thus significantly lowers the overall photosynthetic carbon yield. Optimal dark respiration could minimize carbon loss and improve overall photosynthetic carbon yield. However, it is unclear how photosynthetic organisms best allocate carbon resources at night for dark survival and preparation for the reinitiation of carbon fixation reactions upon light exposure. We show in the cyanobacterium Synechococcus elongatus PCC 7942 that an integrative respiratory pathway in the dark helps allocate carbon resource for cell survival and preparation for photosynthesis reinitiation upon photoinduction. Optimization of dark respiration thus represents a unique strategy to enhance photosynthetic carbon yield and potential crop productivity.
2023-12-21 | MSV000093712 | MassIVE
Project description:A hallmark of Idiopathic Pulmonary Fibrosis is the TGF-β-dependent activation of lung fibroblasts, leading to excessive deposition of collagen proteins and progressive scarring. We have previously shown that synthesis of collagen by lung fibroblasts requires de novo synthesis of glycine, the most abundant amino acid in collagen protein. TGF-β upregulates the expression of the enzymes of the de novo serine/glycine synthesis pathway in lung fibroblasts through mTORC1 and ATF4-dependent transcriptional programs. SHMT2, the final enzyme of the de novo serine/glycine synthesis pathway, transfers a one-carbon unit from serine to tetrahydrofolate (THF), producing glycine and 5,10-methylene-THF (meTHF). meTHF is converted back to THF in the mitochondrial one-carbon (1C) pathway through the sequential actions of MTHFD2 (which converts meTHF to 10-formyl-THF), and either MTHFD1L, which produces formate, or ALDH1L2, which produces CO2. It is unknown how the mitochondrial 1C pathway contributes to glycine biosynthesis or collagen protein production in fibroblasts, or fibrosis in vivo. Here, we demonstrate that TGF-β induces the expression of MTHFD2, MTHFD1L, and ALDH1L2 in human lung fibroblasts. MTHFD2 expression was required for TGF-β-induced cellular glycine accumulation and collagen protein production.
2025-07-16 | GSE302114 | GEO
Project description:Metallosphaera sedula is an extremely thermoacidophilic archaeon that grows heterotrophically on peptides, and chemolithoautotrophically on hydrogen, sulfur, or reduced metals as energy sources. During autotrophic growth, carbon dioxide is incorporated into cellular carbon via the 3-hydroxypropionate /4-hydroxybutyrate cycle (3HP/4HB). To date, all of the steps in the pathway have been connected to enzymes encoded in specific ORFs, except for the one responsible for ligation of coenzyme A (CoA) to 4-hydroxybutyrate (4HB). While several candidates for this step have been identified through bioinformatic analysis of the M. sedula genome, none have been shown to catalyze this biotransformation. Transcriptomic analysis of cells grown under strict H2-CO2 autotrophy was used elucidate additional candidate genes involved in carbon fixation and identify the genes which encode for 4HB-CoA synthetase. Three slide loop for Mse cells includes 3 conditions tested in duplicate (biological repeats from tandem fermentors): autotrophic carbon limited (ACL), autotrophic carbon rich (ACR), and heterotrophic (HTR). Half of an RNA sample for one condition was labeled with Cy3 while the other half was labeled with Cy5. The two differently labeled samples were run on different slides. Each probe is spotted on each slide 5 times (5 replicates; spot intensities for all replicates on slide provided in associated raw data file).
2013-03-05 | E-GEOD-39944 | biostudies-arrayexpress