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Nitrosomonas
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Nitrosomonas
Nitrosomonas is a genus of Gram-negative bacteria belonging to the class Betaproteobacteria. It is one of the five genera of ammonia-oxidizing bacteria and, as an obligate chemolithoautotroph, uses ammonia (NH3) as an energy source and carbon dioxide (CO2) as a carbon source in the presence of oxygen.
Nitrosomonas species are important in the global biogeochemical nitrogen cycle because they increase the bioavailability of nitrogen to plants and play a role in denitrification, a process important for the release of nitrous oxide, a powerful greenhouse gas. These microbes are photophobic and usually generate a biofilm matrix, or form clumps with other microbes, to avoid light. Nitrosomonas can be divided into six lineages:
All species included in this genus have ellipsoidal or rod-shaped cells, which have extensive intracytoplasmic membranes displayed as flattened vesicles.
Most species are motile, possessing a flagellum located in the polar region of the cell. Three basic morphological types of Nitrosomonas have been observed: short rods, rods, and cells with pointed ends. Nitrosomonas species have distinct characteristics regarding size and shape:
Genome sequencing of Nitrosomonas species is important for understanding the ecological role of these bacteria.
Among the various species of Nitrosomonas known today, the complete genomes of N. ureae strain Nm10, N. europaea, and Nitrosomonas sp. Is79 have been sequenced.
The presence of genes for ammonia oxidation characterizes all these species. The first enzyme involved in the ammonia oxidation process is ammonia monooxygenase (AMO), which is encoded by the amoCAB operon. The AMO enzyme catalyzes the oxidation of NH3 (ammonia) to NH2OH (hydroxylamine). The amoCAB operon contains three different genes: amoA, amoB, and amoC. While N. europaea possesses two copies of these genes, N. sp. Is79 and N. ureae strain Nm10 have three copies.
The second enzyme involved in the process of ammonia oxidation is hydroxylamine oxidoreductase (HAO), encoded by the hao operon. This enzyme catalyzes the oxidation of NH2OH to NO, a highly reactive radical intermediate that can be partitioned into the main products of the ammonia oxidation process: N2O, a potent greenhouse gas, and NO2-, a form of nitrogen more bioavailable for crops, but which conversely washes away from fields faster. The hao operon contains different genes such as haoA, which encodes for the functional cytochrome c subunit; cycA, which encodes for cytochrome c554; and cycB, which encodes for quinone reductase. These genes are present in different numbers of copies in various species; for instance, in Nitrosomonas sp. Is79 there are only three copies, while in N. ureae there are four.
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Nitrosomonas
Nitrosomonas is a genus of Gram-negative bacteria belonging to the class Betaproteobacteria. It is one of the five genera of ammonia-oxidizing bacteria and, as an obligate chemolithoautotroph, uses ammonia (NH3) as an energy source and carbon dioxide (CO2) as a carbon source in the presence of oxygen.
Nitrosomonas species are important in the global biogeochemical nitrogen cycle because they increase the bioavailability of nitrogen to plants and play a role in denitrification, a process important for the release of nitrous oxide, a powerful greenhouse gas. These microbes are photophobic and usually generate a biofilm matrix, or form clumps with other microbes, to avoid light. Nitrosomonas can be divided into six lineages:
All species included in this genus have ellipsoidal or rod-shaped cells, which have extensive intracytoplasmic membranes displayed as flattened vesicles.
Most species are motile, possessing a flagellum located in the polar region of the cell. Three basic morphological types of Nitrosomonas have been observed: short rods, rods, and cells with pointed ends. Nitrosomonas species have distinct characteristics regarding size and shape:
Genome sequencing of Nitrosomonas species is important for understanding the ecological role of these bacteria.
Among the various species of Nitrosomonas known today, the complete genomes of N. ureae strain Nm10, N. europaea, and Nitrosomonas sp. Is79 have been sequenced.
The presence of genes for ammonia oxidation characterizes all these species. The first enzyme involved in the ammonia oxidation process is ammonia monooxygenase (AMO), which is encoded by the amoCAB operon. The AMO enzyme catalyzes the oxidation of NH3 (ammonia) to NH2OH (hydroxylamine). The amoCAB operon contains three different genes: amoA, amoB, and amoC. While N. europaea possesses two copies of these genes, N. sp. Is79 and N. ureae strain Nm10 have three copies.
The second enzyme involved in the process of ammonia oxidation is hydroxylamine oxidoreductase (HAO), encoded by the hao operon. This enzyme catalyzes the oxidation of NH2OH to NO, a highly reactive radical intermediate that can be partitioned into the main products of the ammonia oxidation process: N2O, a potent greenhouse gas, and NO2-, a form of nitrogen more bioavailable for crops, but which conversely washes away from fields faster. The hao operon contains different genes such as haoA, which encodes for the functional cytochrome c subunit; cycA, which encodes for cytochrome c554; and cycB, which encodes for quinone reductase. These genes are present in different numbers of copies in various species; for instance, in Nitrosomonas sp. Is79 there are only three copies, while in N. ureae there are four.
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