Shewanella loihica: Difference between revisions

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Haichun Gao, Anna Obraztova, Nathan Stewart, Radu Popa, James K. Fredrickson, James M. Tiedje, Kenneth H. Nealson and Jizhong Zhou. "Shewanella loihica sp. nov., isolated from iron-rich microbial mats in the Pacific Ocean." <u>International Union of Microbiological Societies</u>. 2006. 1 May 2007. [http://ijs.sgmjournals.org/cgi/content/full/56/8/1911#T1].
Haichun Gao, Anna Obraztova, Nathan Stewart, Radu Popa, James K. Fredrickson, James M. Tiedje, Kenneth H. Nealson and Jizhong Zhou. "Shewanella loihica sp. nov., isolated from iron-rich microbial mats in the Pacific Ocean." <u>International Union of Microbiological Societies</u>. 2006. 1 May 2007. [http://ijs.sgmjournals.org/cgi/content/full/56/8/1911#T1].
Otsuka T, Noda T, Noguchi A, Nakamura H, Ibaraki K, Yamaoka K. "Shewanella infection in decompensated liver disease: a septic case." <u>Journal of Gastroenterology</u>. Volume 42 (January 2007) June 1 2007 [http://www.springerlink.com/content/5r31843538842132].


Kegg Encyclopedia. 1 May 2007 [http://www.genome.jp/kegg-bin/show_organism?org=slo].
Kegg Encyclopedia. 1 May 2007 [http://www.genome.jp/kegg-bin/show_organism?org=slo].

Revision as of 03:40, 5 June 2007

A Microbial Biorealm page on the genus Shewanella loihica

Classification

Higher order taxa

Bacteria; Proteobacteria; Gammaproteobacteria; Alteromonadales; Shewanellaceae; Shewanella; Shewanella loihica

Species

NCBI: Taxonomy

Shewanella loihica

Description and significance

Shewanella loihica.jpg

PV-4T marine bacterial strain of Shewanella loihica was isolated at the deep-sea, hydrothermal Naha Vent from iron-rich microbial mats on the South Rift of Loihi Seamount, Hawaii, in the Pacific Ocean. The bacteria was noted as orange and rodlike with a mean length of 1.8 µm and mean width of 0.7 µm. They are psychrotolerant at temperatures between 0-42 degrees C (Haichun Gao et al.). The ability of Shewanella to survive at such extremes in temperature in conjunction with notable respiratory diversity make these bacterial species of supreme interest. Shewanella have been investigated in the past of understand how their physiology allows for varied roles in the environment and have allowed for applicable uses in biotechnology (Gralnick JA et al.). Shewanella have also been linked to pathogenetic potentiality with respect to rare cases of gastrointestinal infection in recent reports in both Israeli & Japanese hospitals ("Shewanella infection in decompensated liver disease: a septic case." Journal of Gastroenterology . Volume 42 (January 2007) June 1 2007 <http://www.springerlink.com/content/5r31843538842132>).

Genome structure

The loihica genome is recorded at having 4602594 nucleotides, 3859 protein genes, and 124 RNA genes. (Kegg Encyclopedia. 1 May 2007 <http://www.genome.jp/kegg-bin/show_organism?org=slo>) PV-4(T) exhibited 16S rRNA gene sequence similarity levels of 99.6% to Shewanella aquimarina, 97.5 % to S. marisflavi, 50.5 % to S. aquimarina and 8.5 % to S. marisflavi (Shewanella loihica PV-4. 2005, JGI Microbes, 1 May 2007. <http://genome.jgi-psf.org/draft_microbes/she_p/she_p.home.html>).

Cell structure and metabolism

The S. loihica is noted as being Gram-negative and motile through polar flagella. ("Shewanella loihica sp. nov., isolated from iron-rich microbial mats in the Pacific Ocean." International Union of Microbiological Societies. 2006. 1 May 2007. <http://ijs.sgmjournals.org/cgi/content/full/56/8/1911#T1>)

Ecology

(Describe any interactions with other organisms (included eukaryotes), contributions to the environment, effect on environment, etc.)

Pathology

(How does this organism cause disease? Human, animal, plant hosts? Virulence factors, as well as patient symptoms.)

Application to Biotechnology

"They are capable of using a variety of compounds as electron acceptors, including oxygen, iron, manganese, uranium, nitrate, nitrite, fumarate, to name a few. This ability makes Shewanella important for bioremediation of contaminated metals and radioactive wastes." (Shewanella loihica PV-4. 2005, JGI Microbes, 1 May 2007. <http://genome.jgi-psf.org/draft_microbes/she_p/she_p.home.html>)

Current Research

Based on phylogenetic and phenotypic characteristics, bacterium PV-4 was classified in the genus Shewanella within a distinct novel species. The name Shewanella loihica sp. nov. is proposed. ("Shewanella loihica sp. nov., isolated from iron-rich microbial mats in the Pacific Ocean." International Union of Microbiological Societies. 2006. 1 May 2007. <http://ijs.sgmjournals.org/cgi/content/full/56/8/1911#T1>)

References

Gralnick JA, Hau HH. "Ecology and Biotechnology of the Genus Shewanella." Annual Review of Microbiology. Expected release Volume 60 (2007) June 1 2007 [1].

Haichun Gao, Anna Obraztova, Nathan Stewart, Radu Popa, James K. Fredrickson, James M. Tiedje, Kenneth H. Nealson and Jizhong Zhou. "Shewanella loihica sp. nov., isolated from iron-rich microbial mats in the Pacific Ocean." International Union of Microbiological Societies. 2006. 1 May 2007. [2].

Otsuka T, Noda T, Noguchi A, Nakamura H, Ibaraki K, Yamaoka K. "Shewanella infection in decompensated liver disease: a septic case." Journal of Gastroenterology. Volume 42 (January 2007) June 1 2007 [3].

Kegg Encyclopedia. 1 May 2007 [4].

Shewanella loihica PV-4. 2005, JGI Microbes, 1 May 2007. [5].

Edited by Niru Sivakumar, a student of Rachel Larsen and Kit Pogliano