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Scientific classification
Domain: Archaea
Kingdom: Crenarchaeota
Phylum: Crenarchaeota
Class: Thermoprotei
Order: Sulfolobales
Family: Sulfolobaceae
Genus: Sulfurisphaera
Kurosawa, Itoh, Iwai, Sugai, Uda, Kimura, Horiuchi & Itoh, 1998

In taxonomy, Sulfurisphaera is a genus of the Sulfolobaceae.

Description and significance[edit]

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[edit]

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

Cell structure and metabolism[edit]

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.


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


Further reading[edit]

Scientific journals[edit]

Scientific books[edit]

  • Stetter, KO (1989). "Order III. Sulfolobales ord. nov. Family Sulfolobaceae fam. nov.". In JT Staley; MP Bryant; N Pfennig; JG Holt. Bergey's Manual of Systematic Bacteriology, Volume 3 (1st ed.). Baltimore: The Williams & Wilkins Co. p. 169. ISBN 0-683-07908-5. 

Scientific databases[edit]

External links[edit]