Caldicellulosiruptor saccharolyticus | |
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Species: | C. saccharolyticus |
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Caldicellulosiruptor saccharolyticus Rainey et al., 1995 [1] | |
Caldicellulosiruptor saccharolyticus is a species of thermophilic, anaerobic cellulolytic bacterium. It was isolated from a piece of wood floating in the flow from a freshwater thermal spring in New Zealand in 1987, and tentatively named Caldocellum saccharolyticum. [2] In 1994, the isolate was more thoroughly characterized physiologically, and classified to a new genus, Caldicellusiruptor, based on 16S RNA sequence. [3] It is the type species, and more thoroughly studied member of its genus.
The Thermomicrobia is a group of thermophilic green non-sulfur bacteria. Based on species Thermomicrobium roseum and Sphaerobacter thermophilus, this bacteria class has the following description:
Thermithiobacillus is a genus of nonsporeforming, rod-shaped, Gram-negative bacteria. The name derives from the Latin thermae, for warm baths, and the Classical Greek θείος, theios for sulfur. The type species of this genus was previously assigned to the genus Thiobacillus, but it was reclassified on the basis of 16S rRNA analysis in 2000, creating this genus.
Sulfur-reducing bacteria are microorganisms able to reduce elemental sulfur (S0) to hydrogen sulfide (H2S). These microbes use inorganic sulfur compounds as electron acceptors to sustain several activities such as respiration, conserving energy and growth, in absence of oxygen. The final product or these processes, sulfide, has a considerable influence on the chemistry of the environment and, in addition, is used as electron donor for a large variety of microbial metabolisms. Several types of bacteria and many non-methanogenic archaea can reduce sulfur. Microbial sulfur reduction was already shown in early studies, which highlighted the first proof of S0 reduction in a vibrioid bacterium from mud, with sulfur as electron acceptor and H2 as electron donor. The first pure cultured species of sulfur-reducing bacteria, Desulfuromonas acetoxidans, was discovered in 1976 and described by Pfennig Norbert and Biebel Hanno as an anaerobic sulfur-reducing and acetate-oxidizing bacterium, not able to reduce sulfate. Only few taxa are true sulfur-reducing bacteria, using sulfur reduction as the only or main catabolic reaction. Normally, they couple this reaction with the oxidation of acetate, succinate or other organic compounds.In general, sulfate-reducing bacteria, are able to use both sulfate and elemental sulfur as electron acceptors. Thanks to its abundancy and thermodynamic stability, sulfate is the most studied electron acceptor for anaerobic respiration that involves sulfur compounds. Elemental sulfur, however, is very abundant and important, especially in deep-sea hydrothermal vents, hot springs and other extreme environments, making its isolation more difficult. Some bacteria – such as Proteus, Campylobacter, Pseudomonas and Salmonella – have the ability to reduce sulfur, but can also use oxygen and other terminal electron acceptors.
Cellulosomes are multi-enzyme extracellular complexes. Cellulosomes are associated with the cell surface and mediate cell attachment to insoluble substrates and degrade them to soluble products which are then absorbed. Cellulosome complexes are intricate, multi-enzyme machines, produced by many cellulolytic microorganisms. They are produced by microorganisms for efficient degradation of plant cell wall polysaccharides, notably cellulose, the most abundant organic polymer on Earth. The multiple subunits of cellulosomes are composed of numerous functional domains that interact with each other and with the cellulosic substrate. One of these subunits, a large glycoprotein "scaffoldin", is a distinctive class of non-catalytic scaffolding polypeptides. The scaffoldin subunit selectively integrates the various cellulases and xylanase subunits into the cohesive complex, by combining its cohesin domains with a typical dockerin domain present on each of the subunit enzymes. The scaffoldin of some cellulosomes, an example being that of Clostridium thermocellum, contains a carbohydrate-binding module that adheres cellulose to the cellulosomal complex.
In taxonomy, Methanomethylovorans is a genus of microorganisms with the family Methanosarcinaceae. This genus was first described in 1999. The species within it generally live in freshwater environments, including rice paddies, freshwater sediments and contaminated soil. They produce methane from methanol, methylamines, dimethyl sulfide and methanethiol. With the exception of M. thermophila, which has an optimal growth temperature of 50 °C, these species are mesophiles and do not tend to grow at temperatures above 40 °C.
Caldococcus is a genus of Archaea in the order Desulfurococcales.
The Chloroflexi or Chlorobacteria are a phylum of bacteria containing isolates with a diversity of phenotypes, including members that are aerobic thermophiles, which use oxygen and grow well in high temperatures; anoxygenic phototrophs, which use light for photosynthesis ; and anaerobic halorespirers, which uses halogenated organics as electron acceptors.
Desulfovirgula is a genus of sulfate reducing, anaerobic, endospore-forming, Gram-positive, thermophilic, motile, rod-shaped bacteria, isolated from an underground mining site in an area of Japan characterized by high geothermal activity. Desulfovirgula thermocuniculi is the sole species in the genus. Electron acceptors that this organism can utilize include sulfate, sulfite, thiosulfate and elemental sulfur, while H2 (in the presence of CO2) and carboxylic acids can be utilized as electron donors. Up to now there is only one species of this genus known Desulfovirgula thermocuniculi
Cytophaga is a genus of Gram-negative, gliding, rod-shaped bacteria. This bacterium is commonly found in soil, rapidly digests crystalline cellulose C. hutchinsonii is able to use its gliding motility to move quickly over surfaces. Although the mechanism for this is not known, there is a belief that the flagella is not used
Thermoanaerobacter is a genus in the phylum Firmicutes (Bacteria). Members of this genus are thermophilic and anaerobic, several of them were previously described as Clostridium species and members of the now obsolete genera Acetogenium and Thermobacteroides
Caldicellulosiruptor bescii is a species of thermophilic, anaerobic cellulolytic bacteria. It was isolated from a geothermally heated freshwater pool in the Valley of Geysers on the Kamchatka Peninsula in Russia in 1990. The species was originally named Anaerocellum thermophilum, but reclassified in 2010, based on genomic data.
Geobacillus thermoglucosidasius is a thermophilic gram-positive bacterium, and a member of the Firmicutes phylum. It was first isolated from soil in Japan in 1983.
Thermoanaerobacter brockii, formerly Thermoanaerobium brockii, is a thermophilic, anaerobic, spore-forming bacteria.
Clostridium stercorarium is a cellulolytic thermophilic bacterium. It is anaerobic, spore-forming and saccharoclastic, with cells being rod-shaped and 0.7 to 0.8 by 2.7 to 7.7 µm in size. Its genome has been sequenced.
Thermosyntropha lipolytica is a lipolytic, anaerobic, alkalitolerant, thermophilic bacteria. It lives in syntrophic coculture with a methanogen. Its cells are non-motile, non-spore forming, straight or slightly curved rods. Its type strain is JW/VS-265T.
Tepidibacter is a genus of Gram-positive bacteria in the family Clostridiaceae.
Thermonema lapsum is a Gram-negative and thermophilic bacterium from the genus of Thermonema which has been isolated from a hot spring in Rotorua in New Zealand.Homospermidine and homospermine are the major polyamines of Thermonema lapsum
Clostridium chartatabidum is a strictly anaerobic and spore-forming bacterium from the genus of Clostridium which has been isolated from an ovine rumen in New Zealand.
Acetomicrobium hydrogeniformans is an anaerobic and moderately thermophilic bacterium from the genus of Acetomicrobium which has been isolated from oil production water from North Slope Borough in the United States.