Erythrobacter Litoralis

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Classification(1)

Higher order taxa

Cellular organisms; Bacteria; Proteobacteria; Alphaproteobacteria; Sphingomonadales; Erythrobacteraceae; Erythrobacter.

Species

NCBI: Taxonomy

Erythrobacter litoralis

Description and significance

The Erythrobacter Litoralis are gram negative bacteria and they are halotolerant aerobic anoxygenic phototrophs marine bacteria. This species is found in the nutrient rich coastal salt seawater. Erythrobacter Litoralis can be found at the Sargasso Sea. These bacteria are well distributed in the euphotic zone. Erythrobacter Litoralis can only grow under aerobic conditions. Like all of other species in the Erythrobacter genus, the Erythrobacter Litoralis species also have no poreforming.

Erythrobacter Litoralis contain bacteriochlorophyll a and large amount of Carotenoids. The bacteriochlorophyll a are found in the Erythrobacter Litoralis's harvesting system. The presence of the bacteriochlorophyll a, however, does not give the Erythrobacter Litoralis the ability of growing phototrophically under anaerobic conditions. The Carotenoids display the smooth red orange color of this species. There is not sure whether the species Erythrobacter Litoralis have any motility. Yet the Erythrobacter Litoralis strain HTCC 25 has flagella and pili for motility.

These Erythrobacter Litoralis are important in recycling of the inorganic and the organic matters, in reducing the toxic Tellurite, and in the studying of the LOV-histidine Kinase system. Therefore it is important to sequence the genome of these bacteria. Because of the Erythrobacter Litoralis sharing the same ability of reducing the Tellurite with Erythromicrobium, the sequenced genome can help revealing the relationship between the two microbes. Also the sequenced genome may explain the rise of the aerobic phototrophic bacteria and the places of those bacteria in the evolution scale. The study of the genome can help clarifing whether gene transfer between the micorbes was the factor for the rise of aerobic anoxygenic phototrophs.

According to the paper, the Erythrobacter Litoralis is an α-4 subclass of the class Proteobacteria. Erythrobacter Litoralis has only Light Harvesting Complex 1 (LH1) and there is no LH2 in these bacteria. These Erythrobacter Litoralis can resist the antibiotic as the Nalidixic acid, the Polymyxin B, and the Streptomycin. However, Erythrobacter Litoralis can not resist the Chloramphenicol, erythromycin, Penicillin, tetracycline.

Cell structure and metabolism

Cell Structure

The Erythrobacter Litoralis is a gram negative cell with no poreforming on its outer membrane. In general, the Erythrobacter Litoralis has no motility, yet the study of the strain HCCT2594 shows the motility of the bacteria. The appearance of these bacteria includes the rod shape and the chain of up to 10 individual bacteria. In the strain HCCT2594, the bacteria's outer appearance also has pili and the flagella.

Erythrobacter Litoralis have the bacteriochlorophyll a and Carotenoids, which are responsible for the smooth red and orange of the bacteria. because Erythrobacter Litoralis have same carotenoids composition, the bacteria have 20 different carotenoids. however, Erythrobacter Litoralis do not have the carotenoids Adonixanthin and 2,3,2',3'-tetrahydroxy-β,β-carotene-4-one. Like all of other species of the genus Erythrobacter, the Erythrobacter Litoralis has Zeaxanthin as major carotenoid. Carotenoids bacteriorubixanthinal and erythroxanthin sulfate display a reddish color of this species.(2)( )

The Erythrobacter Litoralis have light harvesting system, reaction center, developed photosynthetis membrane, the photosynthetic electron transfer system including quinone, cytochrome composition, the transfer of excitation energy from carotenoids to bacteriochlorophyll a.(2)

Metabolism

Oxygen is the major requirement for these aerobic bacteria's metabolism. Although there are bacteriochlorophyll a in the cell, the Erythrobacter Litoralis can not survive without the Oxygen as electron acceptor. These bacteria can reduce the organic matter as energy source and use inorganic matter as electron donor.

When the organic matter becomes scare, these Erythrobacter Litoralis will switch to the inorganic source such as the sulfur compounds. The Erythrobacter Litoralis will perform aerobic anoxygenic phototroph. The sulfur compounds will be reduced with the help of the harvested sun light energy and the oxygen and the electron acceptor.

The Erythrobacter litoralis can be grown on organic carbon such as the Acetate, Butyrate, glucose, and Pyruvate. Those organic carbons are used as the simple carbon sources. It is possible that this species can aslo use the glutamate and Leucine as carbon sources. According to the paper, these Erythrobacter Litoralis can also use the Ammonium, Urea, Amino Acids as nitrogen sources. However, Erythrobacter Litoralis can not use the Nitrate. The inability of using Nitrate as nitrogen source is a common theme for the marine heterotrophic prokaryotes whose the nitrogen sources are dissolved organic matter. The Erythrobacter Litoralis can not have the diazotrophic growth either.

Genome structure

Of all the erythrobacter litoralis, only the strain HTCC2594 genome is completely sequenced. Here the genome reveals the strain has the length of 3,052,398 nucleotides to contain 3056 genes. The genome encodes for 3011 proteins and 45 structural RNAs. There is about 63.1 % of the GCGC in the genome. There are about 15 proteins for the carbohydrate metabolism, 9 proteins for the lipid metabolism, 16 proteins for the amino acid metabolism, and many more proteins for other functions. (1)

Ecology

These Erythrobacter Litoralis live in environments with sufficient sun light and adequate amount of oxygen. Oxygen is needed for their metabolisms. Euphotic zones, where there are at least 1 % of the sun light available, are places that Erythrobacter Litoralis can mostly be found . Although the first Aerobic phototrophic bacterium was discovered in Japan by T. Shiba, the Erythrobacteria genus can be found well distributed around the world. The Erythrobacter Litoralis species can be seen in oceanic coastal lines or places that have rich nutrients and adequate amount of sun light. The Erythrobacter Litoralis HCCT2594 was discovered at Sargasso Sea at a depth of 10 meters.(4)(1)

Pathology

There is no reported disease caused by the Erythrobacter Litoralis.(1)

Although the Erythrobacter Litoralis is not a pathogen, the bacteria share the same LOV- histidine kinase system with Brucella, which is a vicious pathogen.(6)

Application

Because of its ability of reducing the toxic tellurite, Erythrobacter Litoralis species is useful in the process of cleaning up the tellurite oxides. Tellurite compounds are toxic to other bacteria and other organisms including the human. The tellurite compounds are reduced to give the insoluble crystal metal Tellurium. Large amount of the crystal metal Tellurium will be accumulated in the Erythrobacter Litoralis after the reduction. The Erythrobacter Litoralis can store the metal Tellurium up to 30% of its cell’s volume. This gives these bacteria a recognition as the potential bioremediation.(5,2)

The storage of the Tellurium metal in the Erythrobacter Litoralis cell can be harvest for pure Tellurim metal. Erythrobacter Litoralis here is used to extract the Tellurium from the Tellurite compounds such as Tellurium dioxide(TeO2)and Tellurite ion(TeO32-) in the mineral ore.(5,2)

Another application of the Erythrobacter Litoralis is that the bacteria’s genome could provide informations about the LOV-histidine kinase system, which is used by the pathogen Brucella during its invasion of the host. light can increase the virulence of the Brucella who causes a "flu-like disorder Brucellosis" in cattles. Because Erythrobacter Litoralis is a aerobic phototrophic bacteria, it contain the sun-light sensors which have LOV domains. LOV is light, oxygen, and voltage.(6)

The Erythrobacter Litoralis can also be used for its ability of breaking down the organic matters, and therefore, the bacteria help recycling nutrients.

References

1. <http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?id=39960>

2.Vladimir V. Yurkov* and J. Thomas Beatty. "AEROBIC ANOXYGENIC PHOTOTROPHIC BACTERIA," Journal List > Microbiol Mol Biol Rev > v.62(3); Sep 1998. PubMed articles by: Yurkov, V. Beatty, J. Microbiol Mol Biol Rev. 1998 September; 62(3): 695–724. Copyright © 1998, American Society for Microbiology <http://www.pubmedcentral.nih.gov/botrender.fcgi?blobtype=html&artid=98932>

3.Yurkov V , Stackebrandt E, Holmes A, Fuerst JA, Hugenholtz P, Golecki J, Gad'on N, Gorlenko VM, Kompantseva EI, Drews G. "Phylogenetic positions of novel aerobic, bacteriochlorophyll a-containing bacteria and description of Roseococcus thiosulfatophilus gen. nov., sp. nov., Erythromicrobium ramosum gen. nov., sp. nov., and Erythrobacter litoralis sp. nov," Int J Syst Bacteriol, 1994 Jul;44(3):427-34. <http://www.ncbi.nlm.nih.gov/sites/entrez?Db=pubmed&Cmd=ShowDetailView&TermToSearch=7520734&ordinalpos=13&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum>.

4.Michal Koblížek · Oded Béjà · Robert R. Bidigare · Stephanie Christensen · Bryan Benitez-Nelson · Costantino Vetriani · Marcin K. Kolber · Paul G. Falkowski · Zbigniew S. Kolber. "Isolation and Characterization of Erythrobacter.strain from the upper ocean,"Arch Microbiol (2003) 180 : 327–338, DOI 10.1007/s00203-003-0596-6. Received: 14 March 2003 / Revised: 28 July 2003 / Accepted: 6 August 2003 / Published online: 23 September 2003. <http://marine.rutgers.edu/ebme/html_docs/reprints/Koblizek_ArchMicrobiol_180_327-338_2003.pdf>

5. Christopher Rathgeber, Natalia Yurkova, Erko Stackebrandt, J. Thomas Beatty, and Vladimir Yurkov1. " ISOLATION OF TELLURITE- and SELENITE-RESISTANT Bacteria from HYDROTHERMAL VENTS of THE JUAN de FUCA RIDGE in THE PACIFIC OCEAN," Applied and Environmental Microbiology, September 2002, p. 4613-4622, Vol. 68, No. 9. 0099-2240/02/$04.00+0. DOI: 10.1128/AEM.68.9.4613-4622.2002. Copyright ? 2002, American Society for Microbiology. All Rights Reserved. Department of Microbiology, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 Canada, Deutche Sammlung von Mikroorganismen und Zellkulturen Gmbh, D-38124 Braunschweig, Germany, Department of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia, V6T 1Z3 Canada. Received 21 March 2002/ Accepted 21 June 2002.

6. Briggs, Tseng, and SwartzMarcus, A. Frederickson and Roberto A. Bogomolni, Gastón Paris and Fernando A. Goldbaum, Diego J. Comerci and Rodolfo A. Ugalde, Gireesh Rajashekara, Jung-Gun Kim and Mary Beth Mudgett. "NASTY BACTERIA NEED SUNLIGHT TO DO THEIR WORST," Public release date: 23-Aug-2007. <http://www.eurekalert.org/pub_releases/2007-08/ci-nbn082007.php>

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