biology

Protein-disulfide reductase (glutathione)

Protein-disulfide reductase (glutathione) 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 (glutathione) rather than just read about it. In short: In enzymology, a protein-disulfide reductase (glutathione) (EC 1.8.4.2) is an enzyme that catalyzes the chemical reaction 2 glutathione + protein-disulfide ⇌ {\displaystyle \rightleftharpoons } glutathione disulfide + protein-dithiol Thus, the two substrates of this enzyme are glutathione and protein disulfide, whereas its two products are glutathione disulfide and protein dithiol. In humans, at least one protein, T…

Key takeaways

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

Reference excerpt

In enzymology, a protein-disulfide reductase (glutathione) (EC 1.8.4.2) is an enzyme that catalyzes the chemical reaction

2 glutathione + protein-disulfide ⇌ {\displaystyle \rightleftharpoons } glutathione disulfide + protein-dithiol Thus, the two substrates of this enzyme are glutathione and protein disulfide, whereas its two products are glutathione disulfide and protein dithiol. In humans, at least one protein, TXNDC12, is thought to have enzyme activity of this type based on relatively recent data (2003). Historically, the breaking of the disulfide bonds of insulin was thought to be catalyzed by an enzyme of this class, which researcher’s called “glutathione-insulin transhydrogenase” (GIT). Later, the enzyme in question was found to be of the protein disulfide-isomerase family, leading to some ambiguity in the nomenclature. This enzyme belongs to the family of oxidoreductases, specifically those acting on a sulfur group of donors with a disulfide as acceptor. The systematic name of this enzyme class is glutathione:protein-disulfide oxidoreductase. Other names in common use include glutathione-insulin transhydrogenase, insulin reductase, reductase, protein disulfide (glutathione), protein disulfide transhydrogenase, glutathione-protein disulfide oxidoreductase, protein disulfide reductase (glutathione), GSH-insulin transhydrogenase, protein-disulfide interchange enzyme, protein-disulfide isomerase/oxidoreductase, thiol:protein-disulfide oxidoreductase, and thiol-protein disulphide oxidoreductase. This enzyme participates in glutathione metabolism.

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

References

KATZEN HM, TIETZE F, STETTEN D (1963). "Further studies on the properties of hepatic glutathione-insulin transhydro-genase". J. Biol. Chem. 238 (3): 1006–11. doi:10.1016/S0021-9258(18)81250-9. PMID 14031343. Kohnert KD, Hahn HJ, Zuhlke H, Schmidt S, Fiedler H (1974). "Breakdown of exogenous insulin by Langerhans islets of the pancreas in vitro". Biochim. Biophys. Acta. 338: 68–77. doi:10.1016/0304-4165(74)90336-5.

Worked examples

Example 1 — a first encounter with Protein-disulfide reductase (glutathione)

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

In research: Protein-disulfide reductase (glutathione) 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 (glutathione) 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 (glutathione) is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 1.8.4, Enzymes of known structure, Oxidoreductase stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Protein-disulfide reductase (glutathione) 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 Protein-disulfide reductase (glutathione) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Protein-disulfide reductase (glutathione) 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 Protein-disulfide reductase (glutathione) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Protein-disulfide reductase (glutathione) in simple terms?

In enzymology, a protein-disulfide reductase (glutathione) (EC 1.8.4.2) is an enzyme that catalyzes the chemical reaction 2 glutathione + protein-disulfide ⇌ {\displaystyle \rightleftharpoons } glutathione disulfide + protein-dithiol Thus, the two substrates of this enzyme are glutathione and prote…

Why does Protein-disulfide reductase (glutathione) 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 (glutathione)?

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 (glutathione).