Venenivibrio stagnispumantis
| Strain CP.B2 | |
|---|---|
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| Scanning electron microscopy image | |
| Scientific classification | |
| Domain: | Bacteria |
| Phylum: | Aquificae |
| Class: | Aquificae |
| Order: | Aquificales |
| Family: | Hydrogenothermaceae |
| Genus: | Venenivibrio |
| Species: | V. stagnispumantis |
| Binomial name | |
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Venenivibrio stagnispumantis Hetzer et al. 2008 |
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Venenivibrio stagnispumantis strain CP.B2 is the first microorganisms isolated from the terrestrial hot spring Champagne Pool (75 °C, pH 5.5) in Waiotapu, New Zealand.
The cells are motile and slightly curved rods (1.04 to 1.56 µm long and 0.33 to 0.41 µm wide).
The novel bacterium is an obligate chemolithotroph capable of utilizing H2 as electron donor, O2 as corresponding electron acceptor and CO2 as carbon source. Venenivibrio stagnispumantis gains metabolic energy using the "Knallgas" reaction H2 + ½ O2 → H2O. For growth either elemental sulphur (S0) or thiosulfate (S2O32−) is required. Growth is observed under thermophilic conditions between 45 °C and 75 °C (optimum 70 °C), under moderate acidophilic conditions between pH 4.8 and 5.8 (optimum pH 5.4) and under microaerophilic conditions between 1.0% and 10.0% (v/v) O2 (optimum between 4.0% and 8.0% (v/v) O2).
Phylogenetic analysis based on 16S rDNA sequences indicate that strain CP.B2 belongs to the order Aquificales and represents the type strain of a novel species of a new genus within the family Hydrogenothermaceae. The 16S rRNA gene sequence for strain CP.B2 is deposited in the GenBank nucleotide sequence database under accession number DQ989208. The G+C content of the genomic DNA is 29.3 mol% which is the lowest G+C content reported for a species of the order Aquificales.
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