science

Homocysteine thiolactone

Homocysteine thiolactone is a science 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 Homocysteine thiolactone rather than just read about it. In short: Homocysteine thiolactone (HTL) is an organosulfur compound with the formula H2NCHC(O)SCH2CH2. It is the thiolactone (intramolecular thioester) of homocysteine.

Key takeaways

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

Reference excerpt

Homocysteine thiolactone (HTL) is an organosulfur compound with the formula H2NCHC(O)SCH2CH2. It is the thiolactone (intramolecular thioester) of homocysteine. It is produced by methionyl-tRNA synthetase in an error-editing reaction that prevents translational incorporation of homocysteine into proteins. HTL can damage proteins through "homocysteinylation" of protein lysine residues. HTL has been reported to form isopeptide bonds with lysine residues in substrate proteins, a post-translational modification known as N-homocysteinylation (N-Hcy). This causes protein damage via a thiyl radical mechanism. The drugs citiolone and erdosteine are modified versions of homocysteine thiolactone. When N-Hcy binds α-syn, it exacerbates α-syn aggregation, neurotoxicity, and dopaminergic neuronal degeneration. It also damages the protein DJ-1, contributing to Parkinson's disease.

References

Illustrations

Worked examples

Example 1 — a first encounter with Homocysteine thiolactone

Start with the simplest possible case. Write down what Homocysteine thiolactone claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Homocysteine thiolactone 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 Homocysteine thiolactone 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 Homocysteine thiolactone

In research: Homocysteine thiolactone appears in science 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 Homocysteine thiolactone 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: Homocysteine thiolactone is common in secondary-school and first-year university syllabi. It links to neighbouring topics Amines, Thiolactones, Thiolanes, so understanding it makes those chapters shorter.
In everyday life: Look for Homocysteine thiolactone 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 Homocysteine thiolactone in 20 minutes

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

Frequently asked questions

What is Homocysteine thiolactone in simple terms?

Homocysteine thiolactone (HTL) is an organosulfur compound with the formula H2NCHC(O)SCH2CH2. It is the thiolactone (intramolecular thioester) of homocysteine.

Why does Homocysteine thiolactone matter?

Because it connects several science 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 Homocysteine thiolactone?

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 Homocysteine thiolactone.