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What do you mean by enzyme nitrogenase?

Nitrogenase is a complex, bacterial enzyme that catalyzes the ATP-dependent reduction of dinitrogen (N2) to ammonia (NH3). In its most prevalent form, it consists of two proteins, the catalytic molybdenum-iron protein (MoFeP) and its specific reductase, the iron protein (FeP).

What is special about nitrogenase?

Nitrogenase is the only known enzymatic system that converts atmospheric dinitrogen (N2) into bioavailable ammonia (NH3). The active-site cofactor responsible for this reactivity is a [(R-homocitrate)MoFe7S9C] cluster that is designated as the M-cluster.

What enzyme activates nitrogenase?

The activation of the Fe protein of nitrogenase (Rr2) from glutamate-grown Rhodospirillum rubrum by activating enzyme (AE) was investigated. AE is confirmed to have Mr about 20 000 and is shown to operate catalytically.

What is nitrogenase reductase?

Nitrogenase reductase is an enzyme that catalyzes the reduction of dinitrogen to ammonia in the bacterial species Azotobacter vinelandii. This reduction pathway is a main constituent of nitrogen fixation, providing the building blocks for biological molecules, such as amino acids, proteins, and nucleic acids.

What is the role of nitrobacter?

Nitrobacter is a genus comprising rod-shaped, gram-negative, and chemoautotrophic bacteria. Nitrobacter play an important role in the nitrogen cycle by oxidizing nitrite into nitrate in soil and marine systems.

What is Apoenzyme and Holoenzyme?

An apoenzyme is an inactive enzyme, activation of the enzyme occurs upon binding of an organic or inorganic cofactor. Holoenzyme- An apoenzyme together with its cofactor. A holoenzyme is complete and catalytically active. Most cofactors are not covalently bound but instead are tightly bound.

What is the function of nitrogenase?

Nitrogenase (Nase) is an enzyme that fixes atmospheric nitrogen (N2) into ammonia. Though abundantly present in the atmosphere, most organisms cannot utilize N2 directly, and must instead take it in through other forms, like ammonia or nitrate.

What are two metals in nitrogenase?

Nitrogenase consists of two component metalloproteins, the iron (Fe) protein and the molybdenum-iron (MoFe) protein; the Fe protein mediates the coupling of ATP hydrolysis to interprotein electron transfer, whereas the active site of the MoFe protein contains the polynuclear FeMo cofactor, a species composed of seven …

Why are nitrogenase enzymes sensitive to oxygen?

The Nitrogenase enzyme complex (the nitrogen. fixing enzyme) is sensitive to O2, that irreversible inactivates the enzyme. Diazotrophs must employ mechanisms which, on the other hand, permit the supply of O2 required for energy regeneration and protect Nase from the deleterious effect of O2.

What is the nature of an enzyme?

All known enzymes are proteins. They are high molecular weight compounds made up principally of chains of amino acids linked together by peptide bonds.

What is the function of nitrosomonas?

Nitrosomonas is a nitrifying bacteria and does nitrification of soil in nitrogen cycle. It converts nitrogen to nitrite.

What is the key enzyme in nitrogen fixation?

Nitrogen fixation is carried out by the enzyme nitrogenase, which are found in microbes. Key Terms fixation : The act of uniting chemically with a solid substance or in a solid form; reduction to a non-volatile condition; – said of gaseous elements.

What is the true nitrogenase reaction?

Nitrogenase ultimately bonds each atom of nitrogen to three hydrogen atoms to form ammonia (NH 3 ). The nitrogenase reaction additionally produces molecular hydrogen as a side product, which is of special interest for people trying to produce H 2 as an alternative energy source to fossil fuels.

Is the enzyme containing nitrogen?

Nitrogenase is an enzyme responsible for catalyzing nitrogen fixation, which is the reduction of nitrogen (N 2) to ammonia (NH 3) and a process vital to sustaining life on Earth. There are three types of nitrogenase found in various nitrogen-fixing bacteria: molybdenum (Mo) nitrogenase, vanadium (V) nitrogenase , and iron-only (Fe) nitrogenase. [9]