science

Lactacystin

Lactacystin 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 Lactacystin rather than just read about it. In short: Lactacystin is an organic compound naturally synthesized by bacteria of the genus Streptomyces first identified as an inducer of neuritogenesis in neuroblastoma cells in 1991. The target of lactacystin was subsequently found to be the proteasome on the basis of its affinity for certain catalytic subunits of the proteasome by Fenteany and co-workers in 1995.

Key takeaways

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

Reference excerpt

Lactacystin is an organic compound naturally synthesized by bacteria of the genus Streptomyces first identified as an inducer of neuritogenesis in neuroblastoma cells in 1991. The target of lactacystin was subsequently found to be the proteasome on the basis of its affinity for certain catalytic subunits of the proteasome by Fenteany and co-workers in 1995. The proteasome is a protein complex responsible for the bulk of proteolysis in the cell, as well as proteolytic activation of certain protein substrates. Lactacystin was the first non-peptidic proteasome inhibitor discovered and is widely used as a research tool in biochemistry and cell biology. The transformation product of lactacystin clasto-lactacystin β-lactone (also known as omuralide) covalently modifies the amino-terminal threonine of specific catalytic subunits of the proteasome, a discovery that helped to establish the proteasome as a mechanistically novel class of protease: an amino-terminal threonine protease. The molecule is commonly used in biochemistry and cell biology laboratories as a selective inhibitor of the proteasome. The first total synthesis of lactacystin was developed in 1992 by Corey and Reichard, and a number of other syntheses of this molecule have also been published. There are more than 1,660 entries for lactacystin in PubMed as of January 2019.

Illustrations

Worked examples

Example 1 — a first encounter with Lactacystin

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

In research: Lactacystin 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 Lactacystin 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: Lactacystin is common in secondary-school and first-year university syllabi. It links to neighbouring topics Acetamides, Lactams, Pyrrolidones, so understanding it makes those chapters shorter.
In everyday life: Look for Lactacystin 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 Lactacystin in 20 minutes

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

Frequently asked questions

What is Lactacystin in simple terms?

Why does Lactacystin 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 Lactacystin?

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 Lactacystin.