Nitrite oxidoreductase (NOR or NXR) is an enzyme involved in nitrification. It is the last step in the process of aerobic ammonia oxidation, which is carried out by two groups of nitrifying bacteria: ammonia oxidizers such as Nitrosospira, Nitrosomonas, and Nitrosococcus convert ammonia to nitrite, while nitrite oxidizers such as Nitrobacter and Nitrospira oxidize nitrite to nitrate. NXR is responsible for producing almost all nitrate found in nature.[1]
NXR belongs to the class of EC numbers 1.7.2- [2][3] where 1 describes an oxidoreductase, 1.7 describes nitrogen compounds as donors, and 1.7.2- describes cytochromes as acceptors.[3]
^Chicano, Tadeo Moreno; Dietrich, Lea; de Almeida, Naomi M.; Akram, Mohd.; Hartmann, Elisabeth; Leidreiter, Franziska; Leopoldus, Daniel; Mueller, Melanie; Sánchez, Ricardo; Nuijten, Guylaine H. L.; Reimann, Joachim; Seifert, Kerstin-Anikó; Schlichting, Ilme; van Niftrik, Laura; Jetten, Mike S. M. (2021-07-15). "Structural and functional characterization of the intracellular filament-forming nitrite oxidoreductase multiprotein complex". Nature Microbiology. 6 (9): 1129–1139. doi:10.1038/s41564-021-00934-8. ISSN 2058-5276. PMC 8387239. PMID 34267357.
^Caspi, Ron; Billington, Richard; Fulcher, Carol A; Keseler, Ingrid M; Kothari, Anamika; Krummenacker, Markus; Latendresse, Mario; Midford, Peter E; Ong, Quang; Ong, Wai Kit; Paley, Suzanne; Subhraveti, Pallavi; Karp, Peter D (2017-10-20). "The MetaCyc database of metabolic pathways and enzymes". Nucleic Acids Research. 46 (D1): D633–D639. doi:10.1093/nar/gkx935. ISSN 0305-1048. PMC 5753197. PMID 29059334.
Nitriteoxidoreductase (NOR or NXR) is an enzyme involved in nitrification. It is the last step in the process of aerobic ammonia oxidation, which is carried...
oxidoreductase (which oxidizes hydroxylamine to nitric oxide - which is further oxidized to nitrite by a currently unidentified enzyme), and nitrite oxidoreductase...
Several mechanisms for nitrite conversion to NO have been described, including enzymatic reduction by xanthine oxidoreductase, nitrite reductase, and NO synthase...
NADH is still needed for anabolic reactions, these bacteria use a nitriteoxidoreductase to produce enough proton-motive force to run part of the electron...
Nitrite dismutase (EC 1.7.6.1, Prolixin S, Nitrophorin 7) is an enzyme with systematic name nitrite:nitriteoxidoreductase. This enzyme catalyses the following...
directly for use in anabolism. This problem is solved by using a nitriteoxidoreductase to produce enough proton-motive force to run part of the electron...
lacking groups (such as methyl-groups); for example, noradrenaline Nitriteoxidoreductase, an enzyme Nucleolus organizer region, a chromosomal region around...
enzyme responsible for the oxidation of nitrite to nitrate in members of the genus Nitrobacter is nitriteoxidoreductase (NXR), which is encoded by the gene...
organism produces the ammonia according to its requirements. Nitriteoxidoreductase Ferredoxin—nitrite reductase (NiR) involved in the assimilation of nitrates...
great surprise for the scientific community. In the anammox reaction, nitrite and ammonium ions are converted directly into diatomic nitrogen and water...
Hydroxylamine oxidoreductase (HAO) is an enzyme found in the prokaryotic genus Nitrosomonas. It plays a critically important role in the biogeochemical...
important. Nitrite itself does not readily undergo redox reactions, but its metal complexes do. The molybdenum-containing enzyme nitriteoxidoreductase catalyzes...
NXR may refer to: Nitriteoxidoreductase, an enzyme involved in nitrification nxr, the ISO 639-3 code for Ninggerum language REVA NXR, an urban electric...
microenvironment. All members of this genus have the nitriteoxidoreductase genes, and thus are all thought to be nitrite-oxidizers. Ever since nitrifying bacteria...
is the biological oxidation of ammonia to nitrate via the intermediary nitrite. Nitrification is an important step in the nitrogen cycle in soil. The...
Cytochrome c nitrite reductase (ccNiR) (EC 1.7.2.2) is a bacterial enzyme that catalyzes the six electron reduction of nitrite to ammonia; an important...
molecule of ammonia oxidized. Nitrite oxidation is much simpler, with nitrite being oxidized by the enzyme nitriteoxidoreductase coupled to proton translocation...
is suggested that xanthine oxidoreductase, along with other enzymes, participates in the conversion of nitrate to nitrite in mammalian tissues. The protein...
(ambiguous)) is an enzyme with systematic name hydroxylamine:ferricytochrome-c oxidoreductase. This enzyme catalyses the following chemical reaction (1) hydroxylamine...
16, NMO) is an enzyme with systematic name nitronate:oxygen 2-oxidoreductase (nitrite-forming). This enzyme catalyses the following chemical reaction...
Global Information