biology

STK4

STK4 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 STK4 rather than just read about it. In short: Serine/threonine-protein kinase 4 is an enzyme that in humans is encoded by the STK4 gene. Function The protein encoded by this gene is a cytoplasmic kinase that is structurally similar to the yeast Ste20p (sterile 20 protein) kinase, which acts upstream of the stress-induced mitogen-activated protein kinase (MAPK) cascade.

Key takeaways

STK4 belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect STK4 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of STK4 from memory before moving on to harder problems.

Reference excerpt

Serine/threonine-protein kinase 4 is an enzyme that in humans is encoded by the STK4 gene.

Function The protein encoded by this gene is a cytoplasmic kinase that is structurally similar to the yeast Ste20p (sterile 20 protein) kinase, which acts upstream of the stress-induced mitogen-activated protein kinase (MAPK) cascade. The encoded protein can phosphorylate myelin basic protein and undergoes autophosphorylation. A caspase-cleaved fragment of the encoded protein has been shown to be capable of phosphorylating histone H2B. The particular phosphorylation catalyzed by this protein has been correlated with apoptosis, and it's possible that this protein induces the chromatin condensation observed in this process.

Interactions STK4 has been shown to interact with PRKRIR. STK4 has also been shown to prevent, through Yap1 coactivator modulation, haematological tumor cell apoptosis.

References

Illustrations

Worked examples

Example 1 — a first encounter with STK4

Start with the simplest possible case. Write down what STK4 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 STK4 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 STK4 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 STK4

In research: STK4 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 STK4 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: STK4 is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 2.7.11, Genes on human chromosome 20, Human chromosome 20 gene stubs, so understanding it makes those chapters shorter.
In everyday life: Look for STK4 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.

Affiliate

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

How to study STK4 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what STK4 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 STK4 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is STK4 in simple terms?

Serine/threonine-protein kinase 4 is an enzyme that in humans is encoded by the STK4 gene. Function The protein encoded by this gene is a cytoplasmic kinase that is structurally similar to the yeast Ste20p (sterile 20 protein) kinase, which acts upstream of the stress-induced mitogen-activated prot…

Why does STK4 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 STK4?

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 STK4.