biology

Nitrite reductase (NAD(P)H)

Nitrite reductase (NAD(P)H) is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Nitrite reductase (NAD(P)H) rather than just read about it. In short: In enzymology, a nitrite reductase [NAD(P)H] (EC 1.7.1.4) is an enzyme that catalyzes the chemical reaction ammonium hydroxide + 3 NAD(P)+ + H2O ⇌ {\displaystyle \rightleftharpoons } nitrite + 3 NAD(P)H + 3 H+ The 4 substrates of this enzyme are ammonium hydroxide, NAD+, NADP+, and H2O, whereas its 4 products are nitrite, NADH, NADPH, and H+. This enzyme belongs to the family of oxidoreductases, specifically those a…

Key takeaways

Nitrite reductase (NAD(P)H) belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Nitrite reductase (NAD(P)H) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Nitrite reductase (NAD(P)H) from memory before moving on to harder problems.

Reference excerpt

In enzymology, a nitrite reductase [NAD(P)H] (EC 1.7.1.4) is an enzyme that catalyzes the chemical reaction

ammonium hydroxide + 3 NAD(P)+ + H2O ⇌ {\displaystyle \rightleftharpoons } nitrite + 3 NAD(P)H + 3 H+ The 4 substrates of this enzyme are ammonium hydroxide, NAD+, NADP+, and H2O, whereas its 4 products are nitrite, NADH, NADPH, and H+. This enzyme belongs to the family of oxidoreductases, specifically those acting on other nitrogenous compounds as donors with NAD+ or NADP+ as acceptor. 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 oxidoreductase. This enzyme participates in nitrogen metabolism. It has 3 cofactors: FAD, Iron, and Siroheme.

Structural studies As of late 2007, only one structure has been solved for this class of enzymes, with the PDB accession code PDB: 2JO6.

References

Cammack R, Jackson RH, Cornish-Bowden A, Cole JA (1982). "Electron-spin-resonance studies of the NADH-dependent nitrite reductase from Escherichia coli K12". Biochem. J. 207 (2): 333–9. doi:10.1042/bj2070333. PMC 1153865. PMID 6297458. Lazzarini RA; Atkinson DE (1961). "A triphosphopyridine nucleotide-specific nitrite reductase from Escherichia coli". J. Biol. Chem. 236 (12): 3330–3335. doi:10.1016/S0021-9258(18)94019-6. PMID 14463130. Nicholas DJ, Medina A, Jones OT (1960). "A nitrite reductase from Neurospora crassa". Biochim. Biophys. Acta. 37 (3): 468–76. doi:10.1016/0006-3002(60)90503-5. PMID 14426899. Taniguchi H, Mitsui H, Nakamura K, Egami F. "Ann. Acad. Sci. Fenn. Ser. A II 60 (1955) 200". {{cite journal}}: Cite journal requires |journal= (help) Colandene JD, Garrett RH (1996). "Functional dissection and site-directed mutagenesis of the structural gene for NAD(P)H-nitrite reductase in Neurospora crassa". J. Biol. Chem. 271 (39): 24096–104. doi:10.1074/jbc.271.39.24096. PMID 8798648.

Worked examples

Example 1 — a first encounter with Nitrite reductase (NAD(P)H)

Start with the simplest possible case. Write down what Nitrite reductase (NAD(P)H) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Nitrite reductase (NAD(P)H) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Nitrite reductase (NAD(P)H) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Nitrite reductase (NAD(P)H)

In research: Nitrite reductase (NAD(P)H) appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Nitrite reductase (NAD(P)H) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Nitrite reductase (NAD(P)H) is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 1.7.1, Enzymes of known structure, Flavoproteins, so understanding it makes those chapters shorter.
In everyday life: Look for Nitrite reductase (NAD(P)H) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Nitrite reductase (NAD(P)H) in 20 minutes

Read the reference excerpt below once, without taking notes.
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Frequently asked questions

What is Nitrite reductase (NAD(P)H) in simple terms?

In enzymology, a nitrite reductase [NAD(P)H] (EC 1.7.1.4) is an enzyme that catalyzes the chemical reaction ammonium hydroxide + 3 NAD(P)+ + H2O ⇌ {\displaystyle \rightleftharpoons } nitrite + 3 NAD(P)H + 3 H+ The 4 substrates of this enzyme are ammonium hydroxide, NAD+, NADP+, and H2O, whereas its…

Why does Nitrite reductase (NAD(P)H) matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Nitrite reductase (NAD(P)H)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Nitrite reductase (NAD(P)H).