science

Oxyopinin

Oxyopinin 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 Oxyopinin rather than just read about it. In short: Oxyopinins are a group of peptide toxins present in the venom of lynx spiders belonging to the genus Oxyopes, from which they derive their name. Properties Oxyopinins have antimicrobial, haemolytic, and insecticidal activities.

Key takeaways

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

Reference excerpt

Oxyopinins are a group of peptide toxins present in the venom of lynx spiders belonging to the genus Oxyopes, from which they derive their name.

Properties Oxyopinins have antimicrobial, haemolytic, and insecticidal activities. They are the largest linear cationic amphipathic peptides detected in the venom of any spider. They are structurally α-helical peptides.

Subtypes The first five peptides, namely oxyopinins 1, 2a, 2b, 2c, and 2d, were described in 2002 from Oxyopes kitabensis. Oxyopinin 1 is composed of 48 amino acid residues, with a molecular mass of 5221.2 Da. It has significant amino acid sequence similarity to other venoms of other animals. For example, it has 20% sequence similarity with the ant insecticidal peptide ponericinL2. It is also 29% identical to the amino acid residues of the frog antimicrobial peptide dermaseptin. Oxyopinins 2a, 2b, 2c, and 2d (originally designated oxyopinins 2, 3, 4, and 5 respectively) are very similar in their sequences. At least 27 out of 37 their amino acid residues are conserved, that is, identical. Their molecular sizes are 4127.1, 4146.9, 4064.7, and 4156.8 Da respectively. All the oxyopinins indicate their secondary structure essentially as alpha-helical. They cause disruption of both biological membranes and artificial vesicles, particularly to those rich in phosphatidylcholine. They act together with neurotoxins called oxytoxins from the same venom for increased effectiveness as insecticide. The sixth peptide oxyopinin 4a (Oxt-4a) was reported in 2011 from Oxyopes takobius. It is composed of 77 amino acid residues, and has molecular mass of 9,205 Da. It contains a single disulfide bond, Cys4-Cys10, at the N-terminal, which is different from any other spider toxin known so far. Further, unlike other arachnid toxins, Oxt-4a is very similar to defense peptides from the skin of frogs that contain the so-called Rana-box motif (a C-terminal disulfide-enclosed loop).

References

External links Transporter Classification Database Oxyopinin 4a at OPM database Profile at COPE UniProt database MyBioSource Information at Metalife

Worked examples

Example 1 — a first encounter with Oxyopinin

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

In research: Oxyopinin 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 Oxyopinin 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: Oxyopinin is common in secondary-school and first-year university syllabi. It links to neighbouring topics Arachnology, Oxyopidae, Spider toxins, so understanding it makes those chapters shorter.
In everyday life: Look for Oxyopinin 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Oxyopinin” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Oxyopinin in 20 minutes

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

Frequently asked questions

What is Oxyopinin in simple terms?

Oxyopinins are a group of peptide toxins present in the venom of lynx spiders belonging to the genus Oxyopes, from which they derive their name. Properties Oxyopinins have antimicrobial, haemolytic, and insecticidal activities.

Why does Oxyopinin 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 Oxyopinin?

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 Oxyopinin.