Search results
Results From The WOW.Com Content Network
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.
Nitric oxide reductase was assigned Enzyme Commission number (EC) 1.7.2.5. Enzyme Commission numbers are the standard naming system used for enzymes. [5] The EC identifies the class, subclass, sub-subclass, and serial number of the enzyme. [5] Nitric oxide reductase is in Class 1, therefore it is an oxidoreductases. [5] Figure 1. The Nitrogen ...
The key enzymes necessary for releasing energy during oxidation of ammonia to nitrite are ammonia monooxygenase (AMO) and hydroxylamine oxidoreductase (HAO). The first is a transmembrane copper protein which catalyzes the oxidation of ammonia to hydroxylamine ( 1.1 ) taking two electrons directly from the quinone pool.
This tetraheme enzyme has two subunits, each containing a c-type and a d-type heme. The reduced d hemes bind nitrite and convert it to product. [4] Cytochrome c nitrite reductase (ccNIR) is a multiheme enzyme that converts nitrite to ammonia on each active site.
The systematic name of this enzyme class is ammonium-hydroxide:NAD(P)+ oxidoreductase. Other names in common use include nitrite reductase (reduced nicotinamide adenine dinucleotide , (phosphate)) , NADH-nitrite oxidoreductase , NADPH-nitrite reductase , assimilatory nitrite reductase , nitrite reductase [NAD(P)H2] , and NAD(P)H2:nitrite ...
Nitric oxide reductase (NAD(P), nitrous oxide-forming) (EC 1.7.1.14, fungal nitric oxide reductase, cytochrome P450nor, NOR (ambiguous)) is an enzyme with systematic name nitrous oxide:NAD(P) oxidoreductase.
For example, an enzyme that catalyzed this reaction would be an oxidoreductase: A – + B → A + B – In this example, A is the reductant (electron donor) and B is the oxidant (electron acceptor). In biochemical reactions, the redox reactions are sometimes more difficult to see, such as this reaction from glycolysis:
In enzymology, a nitrous oxide reductase also known as nitrogen:acceptor oxidoreductase (N 2 O-forming) is an enzyme that catalyzes the final step in bacterial denitrification, the reduction of nitrous oxide to dinitrogen. [1] [2] N 2 O + 2 reduced cytochome c ⇌ N 2 + H 2 O + 2 cytochrome c