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Ammonia monooxygenase

FieldValue
NameAmmonia monooxygenase
EC_number1.14.99.39

Ammonia monooxygenase (, AMO) is an enzyme, which catalyses the following chemical reaction

: ammonia + AH2 + O2 \rightleftharpoons NH2OH + A + H2O

Ammonia monooxygenase contains copper and possibly nonheme iron. AMO is the first enzyme in ammonia oxidation. Aerobic oxidation of ammonia to hydroxylamine via AMO is an endergonic reaction. So, all aerobic ammonia oxidizing organisms conserve energy by further oxidizing hydroxylamine. It was believed that aerobic ammonia-oxidizing bacteria oxidize hydroxylamine to nitrite using octahaem hydroxylamine oxidoreductase (HAO). Recently, it was shown that the product of HAO is not nitrite but nitric oxide, which is further oxidized to nitrite by an unknown enzyme.

References

References

  1. (August 1994). "Oxidation of methyl fluoride and dimethyl ether by ammonia monooxygenase in Nitrosomonas europaea". Applied and Environmental Microbiology.
  2. (October 1994). "Sequence of the gene, amoB, for the 43-kDa polypeptide of ammonia monoxygenase of Nitrosomonas europaea". Biochemical and Biophysical Research Communications.
  3. (October 1995). "Evidence that particulate methane monooxygenase and ammonia monooxygenase may be evolutionarily related". FEMS Microbiology Letters.
  4. (November 1996). "Evidence for an iron center in the ammonia monooxygenase from Nitrosomonas europaea". FEBS Letters.
  5. (May 1996). "The purification of ammonia monooxygenase from Paracoccus denitrificans". FEBS Letters.
  6. (August 2000). "Electron transfer during the oxidation of ammonia by the chemolithotrophic bacterium Nitrosomonas europaea". Biochimica et Biophysica Acta (BBA) - Bioenergetics.
  7. (October 2002). "Molecular biology and biochemistry of ammonia oxidation by Nitrosomonas europaea". Archives of Microbiology.
  8. (September 2009). "A soluble form of ammonia monooxygenase in Nitrosomonas europaea". Biological Chemistry.
  9. (September 1990). "Oxidation of monohalogenated ethanes and n-chlorinated alkanes by whole cells of Nitrosomonas europaea". Journal of Bacteriology.
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