Geothermobacterium ferrireducens: Difference between revisions

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==References==
==References==
Kashefi, Kazem, Holmes, Dawn E., Reysenbach, Anna-Louise, and Lovley, Derek R.. “Use of Fe(III) as an Electron Acceptor To Recover Previously Uncultured Hyperthermophiles: Isolation and Characterization of Geothermobacterium ferrireducens gen. nov., sp. nov.” Applied and Environmental Microbiology 68.4 (2002): 1735-1742. PubMed Central. Web. 13 Apr. 2014.
Kashefi, Kazem, Holmes, Dawn E., Reysenbach, Anna-Louise, and Lovley, Derek R.. “Use of Fe(III) as an Electron Acceptor To Recover Previously Uncultured Hyperthermophiles: Isolation and Characterization of Geothermobacterium ferrireducens gen. nov., sp. nov.” ''Applied and Environmental Microbiology'' 68.4 (2002): 1735-1742. PubMed Central. Web. 13 Apr. 2014.
 


==Author==
==Author==

Revision as of 14:38, 22 April 2014

This student page has not been curated.

Classification

Domain: Bacteria; Phylum: Unknown; Class: Unknown; Order: Unknown; Family: Thermodesulfobacteriaceae

Species

NCBI: Taxonomy

Genus species: Geothermobacterium ferrireducens

Description and Significance

G. ferrireducens is a novel species, and not much is known about the organism. There are many limitations to infer in physiology and likely biogeochemical reactions and hydrothermal vents. It's a hyperthermophile and an anaerobe. Describe the appearance, habitat, etc. of the organism, and why you think it is important.

Genome Structure

The bacterium is gram negative and is rod shaped. It's 1.0-1.2µm in length and 0.5µm in diameter. It's motile by means of monotrichous flagellation. The number of chromosomes is unknown. An interesting feature is it's optimal temperature is 85-90ºC which is the highest temperature of any bacterial organism. Describe the size and content of the genome. How many chromosomes? Circular or linear? Other interesting features? What is known about its sequence?


Cell Structure, Metabolism and Life Cycle

The cells are seen as single cells or in pairs of cells. G. ferrireducens does not use organic carbon to form energy. The cell surface can have poor crystalline iron oxide, which is a dense material, attached to it. Interesting features of cell structure; how it gains energy; what important molecules it produces.

Current Research

The ability to use Fe(III) as a terminal electron acceptor is a highly conserved characteristic in hyperthermophilic microorganisms. Further studies that use Fe(III) as an electron acceptor in pure cultures may be able to recover other uncultured hyperthermophiles. Ultimately, there is still some physiological and biochemical data that is unknown about G. ferrireducens and therefore a great deal of research must be further conducted.


Ecology and Pathogenesis

It's habitat is the obsidian pools in Yellowstone National Park where the bacterium was first isolated from. Studies have elucidated 16S rDNA sequences from hydrothermal vents to be more closely related to the 16S rDNA sequence of strain FW-1a, rather than T. commune or T.hveragerdense. This relationship is important, because findings that once suggested microorganisms to be capable of sulfate reduction. However, microorganisms may not have the capacity for sulfate reduction or heterotrophic metabolism, but rather autotrophic hydrogen oxidizing Fe(III)-reducing microorganisms, with a physiology more similar to that of strain FW-1a. These results illustrate there are still limitations to inferring physiology as well as biogeochemical reactions in hydrothermal environments based on the analysis of 16S rDNA sequences. Habitat; symbiosis; biogeochemical significance; contributions to environment.
If relevant, how does this organism cause disease? Human, animal, plant hosts? Virulence factors, as well as patient symptoms.

References

Kashefi, Kazem, Holmes, Dawn E., Reysenbach, Anna-Louise, and Lovley, Derek R.. “Use of Fe(III) as an Electron Acceptor To Recover Previously Uncultured Hyperthermophiles: Isolation and Characterization of Geothermobacterium ferrireducens gen. nov., sp. nov.” Applied and Environmental Microbiology 68.4 (2002): 1735-1742. PubMed Central. Web. 13 Apr. 2014.

Author

Page authored by Katy Matson and Janessa Esquible, student of Prof. Edward Walker and Kazem Kashefi at Michigan State University.