biology

Protein-disulfide reductase

Protein-disulfide reductase 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 Protein-disulfide reductase rather than just read about it. In short: In enzymology, a protein-disulfide reductase (EC 1.8.1.8) is an enzyme that catalyzes the chemical reaction protein dithiol + NAD(P)+ ⇌ {\displaystyle \rightleftharpoons } protein disulfide + NAD(P)H + H+ Humans have an enzyme of this type which is coded by the gene NXN (nucleoredoxin), and is involved in the regulation of the Wnt signaling pathway. The 3 substrates of this enzyme are protein dithiol, NAD+, and NADP…

Key takeaways

Protein-disulfide reductase belongs to biology; place it in that map before memorising details.
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Reference excerpt

In enzymology, a protein-disulfide reductase (EC 1.8.1.8) is an enzyme that catalyzes the chemical reaction

protein dithiol + NAD(P)+ ⇌ {\displaystyle \rightleftharpoons } protein disulfide + NAD(P)H + H+ Humans have an enzyme of this type which is coded by the gene NXN (nucleoredoxin), and is involved in the regulation of the Wnt signaling pathway. The 3 substrates of this enzyme are protein dithiol, NAD+, and NADP+, whereas its 4 products are protein disulfide, NADH, NADPH, and H+. This enzyme belongs to the family of oxidoreductases, specifically those acting on a sulfur group of donors with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is protein-dithiol:NAD(P)+ oxidoreductase. Other names in common use include protein disulphide reductase, insulin-glutathione transhydrogenase, disulfide reductase, and NAD(P)H2:protein-disulfide oxidoreductase.

Structural studies As of late 2007, 8 structures have been solved for this class of enzymes, with PDB accession codes PDB: 1UC7, PDB: 1VRS, PDB: 1Z5Y, PDB: 2FWE, PDB: 2FWF, PDB: 2FWG, PDB: 2FWH, and PDB: 2PPT.

References

HATCH MD, TURNER JF (1960). "A protein disulphide reductase from pea seeds". Biochem. J. 76 (3): 556–62. doi:10.1042/bj0760556. PMC 1204833. PMID 13712218.

Worked examples

Example 1 — a first encounter with Protein-disulfide reductase

Start with the simplest possible case. Write down what Protein-disulfide reductase 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 Protein-disulfide reductase 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 Protein-disulfide reductase 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 Protein-disulfide reductase

In research: Protein-disulfide reductase 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 Protein-disulfide reductase 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: Protein-disulfide reductase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 1.8.1, Enzymes of known structure, NADH-dependent enzymes, so understanding it makes those chapters shorter.
In everyday life: Look for Protein-disulfide reductase 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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Frequently asked questions

What is Protein-disulfide reductase in simple terms?

In enzymology, a protein-disulfide reductase (EC 1.8.1.8) is an enzyme that catalyzes the chemical reaction protein dithiol + NAD(P)+ ⇌ {\displaystyle \rightleftharpoons } protein disulfide + NAD(P)H + H+ Humans have an enzyme of this type which is coded by the gene NXN (nucleoredoxin), and is invo…

Why does Protein-disulfide reductase 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 Protein-disulfide reductase?

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 Protein-disulfide reductase.