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Effect of moderate pressures in Acetobacterium wieringae strain JM

ABSTRACT: Effect of moderate pressures in syngas fermentation by a pure culture of Acetobacterium wieringae strain JM

PROVIDER: PRJEB42520 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR5103821_1.fastq.gz	Fastqsanger.gz
	ERR5103821_2.fastq.gz	Fastqsanger.gz

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Project description:Isoprene-metabolizing bacteria represent a global regulator for atmospheric isoprene concentrations. Under anoxic conditions, isoprene can be used as an electron acceptor reducing it to methylbutene. This study describes the proteogenomic profiling of an isoprene reducing enrichment culture to identify organisms and genes responsible for the isoprene hydrogenation reaction. A metagenome assembled genome (MAG) of the most abundant (88 % rel. abundance) lineage in the enrichment, Acetobacterium wieringae, was obtained. Comparative proteogenomics and RT-PCR identified a five-gene operon from the A. wieringae MAG upregulated during isoprene reduction. The operon encodes a putative oxidoreductase, three pleiotropic nickel chaperones (HypA, HypA, HypB) and one 4Fe-4S ferredoxin. The oxidoreductase is proposed as the putative isoprene reductase with a binding site for NADH, FAD as well as two pairs of [4Fe-4S]-clusters. Other Acetobacterium strains (A. woodii DSM 1030, A. wieringae DSM 1911, A. malicum DSM 4132 and A. dehalogenans DSM 11527) do not encode the isoprene reduction operon and could not reduce isoprene. Uncharacterized homologs of the putative isoprene reductase are observed across the Firmicutes, Spirochaetes, Tenericutes, Actinobacteria, Chloroflexi, Bacteroidetes and Proteobacteria, suggesting the ability of biohydrogenation of non-functionalized conjugated doubled bonds in other unsaturated hydrocarbons.

2023-03-08 | PXD023683 | Pride

Acetobacterium wieringae strain:DSM 1911

Project description:Acetobacterium wieringae strain:DSM 1911 Genome sequencing and assembly

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Enrichment of Anaerobic Syngas-Converting Communities and Isolation of a Novel Carboxydotrophic Acetobacterium wieringae Strain JM.

Project description:Syngas is a substrate for the anaerobic bioproduction of fuels and valuable chemicals. In this study, anaerobic sludge was used for microbial enrichments with synthetic syngas and acetate as main substrates. The objectives of this study were to identify microbial networks (in enrichment cultures) for the conversion of syngas to added-value products, and to isolate robust, non-fastidious carboxydotrophs. Enrichment cultures produced methane and propionate, this last one an unusual product from syngas fermentation. A bacterium closely related to Acetobacterium wieringae was identified as most prevalent (87% relative abundance) in the enrichments. Methanospirillum sp. and propionate-producing bacteria clustering within the genera Anaerotignum and Pelobacter were also found. Further on, strain JM, was isolated and was found to be 99% identical (16S rRNA gene) to A. wieringae DSM 1911T. Digital DNA-DNA hybridization (dDDH) value between the genomes of strain JM and A. wieringae was 77.1%, indicating that strain JM is a new strain of A. wieringae. Strain JM can grow on carbon monoxide (100% CO, total pressure 170 kPa) without yeast extract or formate, producing mainly acetate. Remarkably, conversion of CO by strain JM showed shorter lag phase than in cultures of A. wieringae DSM 1911T, and about four times higher amount of CO was consumed in 7 days. Genome analysis suggests that strain JM uses the Wood-Ljungdahl pathway for the conversion of one carbon compounds (CO, formate, CO2/H2). Genes encoding bifurcational enzyme complexes with similarity to the bifurcational formate dehydrogenase (Fdh) of Clostridium autoethanogenum are present, and possibly relate to the higher tolerance to CO of strain JM compared to other Acetobacterium species. A. wieringae DSM 1911T grew on CO in medium containing 1 mM formate.

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