biology

Glutathione peroxidase 3

Glutathione peroxidase 3 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 Glutathione peroxidase 3 rather than just read about it. In short: Glutathione peroxidase 3 (GPx-3), also known as plasma glutathione peroxidase (GPx-P) or extracellular glutathione peroxidase is an enzyme that in humans is encoded by the GPX3 gene. GPx-3 belongs to the glutathione peroxidase family, which functions in the detoxification of hydrogen peroxide.

Key takeaways

Glutathione peroxidase 3 belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Glutathione peroxidase 3 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Glutathione peroxidase 3 from memory before moving on to harder problems.

Reference excerpt

Glutathione peroxidase 3 (GPx-3), also known as plasma glutathione peroxidase (GPx-P) or extracellular glutathione peroxidase is an enzyme that in humans is encoded by the GPX3 gene. GPx-3 belongs to the glutathione peroxidase family, which functions in the detoxification of hydrogen peroxide. It contains a selenocysteine (Sec) residue at its active site. The selenocysteine is encoded by the UGA codon, which normally signals translation termination. The 3' UTR of Sec-containing genes have a common stem-loop structure, the sec insertion sequence (SECIS), which is necessary for the recognition of UGA as a Sec codon rather than as a stop signal.

Thiol specificity GPx-3 has a wide thiol specificity. The sources of reducing power for GPx-3 in vitro include GSH, cysteine, mercaptoethanol, and dithiothreitol. There is an evidence of effectiveness of homocysteine in reduction of GPx-3: GSH can be completely replaced by reduced homocysteine in vitro.

Changes during ontogeny In the rat blood plasma, the GPx-3 activity is low during the first two weeks after birth and rapidly increasing during transition from milk nutrition to solid food. Aging is accompanied by decrease in GPx-3 activity: in the blood plasma of rats it occurs around 23-26 months of age.

References

Illustrations

Worked examples

Example 1 — a first encounter with Glutathione peroxidase 3

Start with the simplest possible case. Write down what Glutathione peroxidase 3 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 Glutathione peroxidase 3 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 Glutathione peroxidase 3 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 Glutathione peroxidase 3

In research: Glutathione peroxidase 3 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 Glutathione peroxidase 3 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: Glutathione peroxidase 3 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Antioxidants, EC 1.11.1, Genes on human chromosome 5, so understanding it makes those chapters shorter.
In everyday life: Look for Glutathione peroxidase 3 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 Glutathione peroxidase 3 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Glutathione peroxidase 3 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 Glutathione peroxidase 3 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Glutathione peroxidase 3 in simple terms?

Why does Glutathione peroxidase 3 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 Glutathione peroxidase 3?

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 Glutathione peroxidase 3.