Pyrolobus fumarii

Pyrolobus fumarii

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Classification

Higher order taxa:

Archaea; Crenarchaeota; Thermoprotei; Desulfurococcales; Pyrodictiaceae

Species:

Pyrolobus fumarii (Synonyms: Pyrolobus Blochl et al. 1999)

Description and Significance

Pyrolobus fumarii are made up of cells that are regulary to irregulary lobed cocci. Chemolithoautotrophic growth by anaerobic and microaerophilic H2 oxidation with NO₃^-, S₂O₃^2-, and O₂ as electron accepters. By doing so well at temperatures of 95ºC to 113ºC, our knowledge about the upper limits of life is expanded.

Genome Structure

DNA Base composition

Determined by a direct analysis of its mononucleosides and melting point analysis,Pyrolobus fumarii has a cytosine-guanine composition of 52.9mol% and 53.4mol% respectively. (Blochl et al. 1997)

DNA-DNA homology

The closest relatives of Pyrolobus fumarii are members of Pyrodictium' based off 16S rRNA partial sequencing. There is insignificant DNA homology between Pyrolobus fumarii, Pyrodictium occultum, and Pyrodictium abyssi as shown in a DNA/DNA hybridization. (Blochl et al. 1997)

Cell Structure

File:Cell structure.JPG

The cell cycle of Caulobacter showing the two daughter cells, one with a stalk and one with a flagellum, that are different in function and structure. From Jacobs-Wagner