biology

Nitroreductase

Nitroreductase 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 Nitroreductase rather than just read about it. In short: Nitroreductases are a family of evolutionarily related proteins involved in the reduction of nitrogen-containing compounds, including those containing the nitro functional group. Members of this family utilise flavin mononucleotide as a cofactor and are often found to be homodimers.

Key takeaways

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

Reference excerpt

Nitroreductases are a family of evolutionarily related proteins involved in the reduction of nitrogen-containing compounds, including those containing the nitro functional group. Members of this family utilise flavin mononucleotide as a cofactor and are often found to be homodimers. Members of this family include oxygen-insensitive NAD(P)H nitroreductase (flavin mononucleotide-dependent nitroreductase) (6,7-dihydropteridine reductase) (EC 1.5.1.34) and NADH dehydrogenase (EC 1.6.99.3). A number of these proteins are described as oxidoreductases. They are primarily found in bacterial lineages though a number of eukaryotic homologs have been identified: C. elegans P34273, D. melanogaster Q8T3Q0, Q9VTE7, mouse Q9DCX8 and human O75989. This protein is not found in photosynthetic eukaryotes. The sequences containing this entry in photosynthetic organisms are possible false positives. The nitroreductase of Enterobacter cloacae was identified by Bryant and Deluca in a strain isolated from a munitions facility, on the basis of its ability to metabolize TNT (trinitrotoluene). Since then many homologues have been identified and the family is now known to include members in diverse organisms, that catalize diverse reactions. The iodotyrosine deiodenase of mammals is a dehalogenase, the BluB of Sinorhizobium meliloti cannibalizes the bound flavin mononucleotideto furnish a critical intermediate in vitamin B12 biosynthesis. Crystal structures of the E. cloacae and E. coli enzymes have been published with a variety of substrates and analogues bound. An example of a potential cold-active enzyme for prodrug therapy was described using a cold-active nitroreductase, Ssap-NtrB (Çelik and Yetis, 2012). Despite Ssap-NtrB derived from a mesophilic bacterium, it showed optimal activity at 20°C against cancer prodrugs. Authors comment that the cold-activity of this novel enzyme will be useful for therapies in combination with crymotherapy, exposing the target tissue to low temperatures in order to trigger the enzyme activity to activate the drug only where is required. Moreover, the enzyme could also be used for bioremediation of compounds of explosive and volatile nature in regions where high activity at low temperatures is needed.

Subfamilies Cob(II)yrinic acid a,c-diamide reductase InterPro: IPR012825

Human proteins containing this domain Iodotyrosine deiodinase (IYD)

References

Worked examples

Example 1 — a first encounter with Nitroreductase

Start with the simplest possible case. Write down what Nitroreductase 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 Nitroreductase 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 Nitroreductase 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 Nitroreductase

In research: Nitroreductase 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 Nitroreductase 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: Nitroreductase is common in secondary-school and first-year university syllabi. It links to neighbouring topics Membrane protein stubs, Protein domains, Single-pass transmembrane proteins, so understanding it makes those chapters shorter.
In everyday life: Look for Nitroreductase 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 Nitroreductase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Nitroreductase means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Nitroreductase out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Nitroreductase in simple terms?

Why does Nitroreductase 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 Nitroreductase?

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 Nitroreductase.