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ABSTRACT: thermophilic microorganisms from aquifer sediments

PROVIDER: PRJNA1229524 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR32514004_1.fastq.gz	Fastqsanger.gz
	SRR32514004_2.fastq.gz	Fastqsanger.gz
	SRR32514005_1.fastq.gz	Fastqsanger.gz
	SRR32514005_2.fastq.gz	Fastqsanger.gz
	SRR32514006_1.fastq.gz	Fastqsanger.gz

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Project description:Groundwater-derived microorganisms are known to play an important role in biogeochemical C, S and N cycling. Thereby, the presence and majorly the activity of microorganisms in aquifers affect enormously the nutrient cycling. However, the diversity and their functional capability in natural aquifers are still rare and therefore a better knowledge of the core microbial communities is urgently needed. Metaproteome analysis was applied to characterize the repertoire of microbes in the depth and to identify the key drivers of major biogeochemical processes. Therefore, 1000 L water from the aquifer was sampled by filtration on 0.3 µm glass filters. After protein extraction, proteolytic cleavage and mass spectrometric analysis (Ultimate 3000 nanoRSLC coupled to Q Exactive HF instrument), 3808 protein groups (2371 proteins with ≥2 peptides) were identified from 13,204 peptides. The findings of our study have broad implications for the understanding of aquifer cycling’s which finally leads to a greatly improved understanding of the ecosystem services provided by the microbial communities present in aquifers. In the future, functional results would allow to monitor and to assess pollution effects which would beneficially assist groundwater resource management.

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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

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