Sulfurisphaera

Sulfurisphaera
Scientific classification
Domain:	Archaea
Phylum:	Crenarchaeota
Class:	Thermoprotei
Order:	Sulfolobales
Family:	Sulfolobaceae
Genus:	Sulfurisphaera; Kurosawa et al. 1998
Type species
	Sulfurisphaera ohwakuensis; Kurosawa et al. 1998
Species
	S. javensis; S. ohwakuensis; S. tokodaii;

Sulfurisphaera is a genus of the Sulfolobaceae.

Description and significance

Sulfurisphaera is a facultatively anaerobic, thermophilic, Gram-negative archaeon that occurs in acidic solfataric fields. The organism grows under the temperature range of 63–92 °C with the optimum temperature at 84 °C, and under the pH range of 1.0–5.0, with an optimum of pH 2.0. It forms colonies that are smooth, roundly convex, and slightly yellow.

Genome structure

The genome of Sulfurisphaera is yet to be sequenced. The G + C content is estimated to be 30–33%.

Cell structure and metabolism

The spherical cells of Sulfurisphaera ohwakuensis are 1.2–1.5 µm in diameter. Thin sections of the organism reveal an envelope (approx. 24 nm) surrounding the cell membrane. It grows organotrophically on proteinaceous, complex substrates such as yeast extract, peptone, and tryptone. Growth was not observed on single sugars or amino acids such as D-glucose, D-galactose, D-fructose, D-xylose, lactose, maltose, sucrose, alanine, glutamate, glycine, and histidine.

Ecology

The strains of Sulfurisphaera ohwakuensis were isolated from multiple locations in the acidic hot springs in Ohwaku Valley, Hakone, Japan.^[1]

References

↑ See the NCBI webpage on Sulfurisphaera. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. Retrieved 2007-03-19.

External links

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[1] See the NCBI webpage on Sulfurisphaera. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. Retrieved 2007-03-19.

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