science

ImKTx88

ImKTx88 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 ImKTx88 rather than just read about it. In short: ImKTx88 is a selective inhibitor of the Kv1 ion channel family that can be isolated from the venom of the Isometrus maculatus (lesser brown scorpion). This peptide belongs to the α-KTx subfamily and is classified as a pore-blocking toxin.

Key takeaways

ImKTx88 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect ImKTx88 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of ImKTx88 from memory before moving on to harder problems.

Reference excerpt

ImKTx88 is a selective inhibitor of the Kv1 ion channel family that can be isolated from the venom of the Isometrus maculatus (lesser brown scorpion). This peptide belongs to the α-KTx subfamily and is classified as a pore-blocking toxin.

Etymology The name ImKTx88 is derived from the scorpion species, Isometrus maculatus, its target, K channels, the abbreviation of toxin, Tx, and the clone number in the cDNA library, 88.

Sources ImKTx88 is a peptide that can be isolated from the venom produced by the glands of Isometrus maculatus (lesser brown scorpion).

Chemistry

Family and homology ImKTx88 belongs to the α-KTx family. This peptide has not shown a high percentage of sequence similarity with other toxins selective for the same family of K+ channels α-KTx and may be classified in a new group among the related Kv blocker.

Structure ImKTx88 complete sequence has a mass of 6,763 kDa and is constituted by 60 amino acids. The mature toxin, which misses the signal peptide of 22 amino acids, has a mass of 4,33 kDa and is constituted by 38 amino acids residues. The peptide folds in three secondary structures: one α-helix at N-terminus, three anti-parallel β-sheets at C-terminus. The α-helix contains acidic residues, whereas β-sheets contain basic ones. Additionally, three disulphide bridges form the tertiary structure. These structures patterns suggest that ImKTx88 may be a potential Kv channel blocker for its similarity with Kv channel blocker family. Although, its amino acid sequence is not very similar, the predicted folded protein was reasonably similar to most Kv channel blockers. The typical aromatic ring with a lysine, found for alpha-KTX-family is present. Amino acid sequence: MSNFSVFLIA LLFCSVFILS EAQIYTSKEC NGSSECYSHC EGITGKRSGK CINKKCYCYR

Target ImKTx88 binds at the pore of the potassium channels Kv1.1, Kv1.2 and Kv1.3. The basic residues on the anti-parallel β-sheets are implicated in this interaction. The toxin has a higher affinity for Kv1.3 than for Kv1.1 and Kv1.2, with an IC50 of 91 pM, 389 nM and 8,47 μM respectively.

Mode of action ImKTx88 is classified as a pore-blocking toxin. ImKTx88 blocks Kv1.3 channels, which are present in dendritic cells, lymphocytes, mitral cells and are also localized in the nucleus of several types of cells in cancer and in brain tissue. Kv1.3 channels regulate the resting membrane potential, and the toxin might thus disrupt membrane repolarization and calcium signalling.

Toxicity Isometrus maculatus has been classified as mildly venomous species. Its sting displays a variety of neurotoxic symptoms like numbness and paraesthesia. The neurotoxic features may be related to the modulation of ion channels by the toxin.

Therapeutic use ImKTx88 ameliorate pathological severity in experimental autoimmune encephalomyelitis (EAE) rats by reducing extravasation into central nervous system (CNS) and by stabilizing the blood-brain barrier (BBB). Moreover, this toxin improves the severity of loss or redistribution of tight junction proteins, and inhibits over-expression of ICAM-1 and VCAM-1 in the brain from EAE rats. ImKTx88 is being investigated as a novel therapeutic agent for multiple sclerosis (MS) treatment. In macrophages, knock-down experiments of kcna3 (gene of Kv1.3) impaired cell growth and migration, features characteristic of cancer development

References

Illustrations

Worked examples

Example 1 — a first encounter with ImKTx88

Start with the simplest possible case. Write down what ImKTx88 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 ImKTx88 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 ImKTx88 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 ImKTx88

In research: ImKTx88 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 ImKTx88 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: ImKTx88 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Ion channel toxins, Scorpion toxins, so understanding it makes those chapters shorter.
In everyday life: Look for ImKTx88 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 ImKTx88 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what ImKTx88 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 ImKTx88 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is ImKTx88 in simple terms?

Why does ImKTx88 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 ImKTx88?

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 ImKTx88.