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Desulfotignum phosphitoxidans

ABSTRACT: Desulfotignum phosphitoxidans overview

PROVIDER: PRJNA196538 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	APJX01.dat.gz	Other
	APJX01.fasta.gz	Fasta.gz
	APJX01.master.dat	Other

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Life based on phosphite: a genome-guided analysis of Desulfotignum phosphitoxidans.

Project description:BACKGROUND: The Delta-Proteobacterium Desulfotignum phosphitoxidans is a type strain of the genus Desulfotignum, which comprises to date only three species together with D. balticum and D. toluenicum. D. phosphitoxidans oxidizes phosphite to phosphate as its only source of electrons, with either sulfate or CO2 as electron acceptor to gain its metabolic energy, which is of exclusive interest. Sequencing of the genome of this bacterium was undertaken to elucidate the genomic basis of this so far unique type of energy metabolism. RESULTS: The genome contains 4,998,761 base pairs and 4646 genes of which 3609 were assigned to a function, and 1037 are without function prediction. Metabolic reconstruction revealed that most biosynthetic pathways of Gram negative, autotrophic sulfate reducers were present. Autotrophic CO2 assimilation proceeds through the Wood-Ljungdahl pathway. Additionally, we have found and confirmed the ability of the strain to couple phosphite oxidation to dissimilatory nitrate reduction to ammonia, which in itself is a new type of energy metabolism. Surprisingly, only two pathways for uptake, assimilation and utilization of inorganic and organic phosphonates were found in the genome. The unique for D. phosphitoxidans Ptx-Ptd cluster is involved in inorganic phosphite oxidation and an atypical C-P lyase-coding cluster (Phn) is involved in utilization of organophosphonates. CONCLUSIONS: We present the whole genome sequence of the first bacterium able to gain metabolic energy via phosphite oxidation. The data obtained provide initial information on the composition and architecture of the phosphite-utilizing and energy-transducing systems needed to live with phosphite as an unusual electron donor.

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Draft Genome Sequence of Desulfotignum phosphitoxidans DSM 13687 Strain FiPS-3.

Project description:We report the 5.008-Mbp assembled draft genome sequence of Desulfotignum phosphitoxidans strain FiPS-3 (DSM 13687), which gains metabolic energy from the oxidation of phosphite to phosphate. Its genome provides insights into the composition and architecture of the phosphite-utilizing and energy-transducing systems required to live with phosphite as electron donor.

| S-EPMC3662817 | biostudies-literature

Identification and heterologous expression of genes involved in anaerobic dissimilatory phosphite oxidation by Desulfotignum phosphitoxidans.

Project description:Desulfotignum phosphitoxidans is a strictly anaerobic, Gram-negative bacterium that utilizes phosphite as the sole electron source for homoacetogenic CO2 reduction or sulfate reduction. A genomic library of D. phosphitoxidans, constructed using the fosmid vector pJK050, was screened for clones harboring the genes involved in phosphite oxidation via PCR using primers developed based on the amino acid sequences of phosphite-induced proteins. Sequence analysis of two positive clones revealed a putative operon of seven genes predicted to be involved in phosphite oxidation. Four of these genes (ptxD-ptdFCG) were cloned and heterologously expressed in Desulfotignum balticum, a related strain that cannot use phosphite as either an electron donor or as a phosphorus source. The ptxD-ptdFCG gene cluster was sufficient to confer phosphite uptake and oxidation ability to the D. balticum host strain but did not allow use of phosphite as an electron donor for chemolithotrophic growth. Phosphite oxidation activity was measured in cell extracts of D. balticum transconjugants, suggesting that all genes required for phosphite oxidation were cloned. Genes of the phosphite gene cluster were assigned putative functions on the basis of sequence analysis and enzyme assays.

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