biology

GHKL domain

GHKL domain 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 GHKL domain rather than just read about it. In short: The GHKL domain (Gyrase, Hsp90, Histidine Kinase, MutL) is an evolutionary conserved protein domain. It is an ATPase domain found in several ATP-binding proteins such as histidine kinase, DNA gyrase B, topoisomerases, heat shock protein HSP90, phytochrome-like ATPases and DNA mismatch repair proteins.

Key takeaways

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

Reference excerpt

The GHKL domain (Gyrase, Hsp90, Histidine Kinase, MutL) is an evolutionary conserved protein domain. It is an ATPase domain found in several ATP-binding proteins such as histidine kinase, DNA gyrase B, topoisomerases, heat shock protein HSP90, phytochrome-like ATPases and DNA mismatch repair proteins. More information about this protein can be found at Protein of the Month: DNA Topoisomerase.

Structure The fold of this domain consists of two layers, alpha/beta, which contain an 8-stranded mixed beta-sheet.

Subfamilies Heat shock protein Hsp90, N-terminal InterPro: IPR020575

Sensor histidine kinase NatK, C-terminal domain InterPro: IPR032834

Members BCKDK HSP90AA1, HSP90AB1, HSP90B1 MLH1, MLH3, MORC1, MORC2, MORC3, MORC4 PDK1, PDK2, PDK3, PDK4 PMS1, PMS2, PMS2L1, PMS2L11, PMS2L3, PMS4L TOP2A, TOP2B TRAP1, TRRAP

References

Illustrations

Worked examples

Example 1 — a first encounter with GHKL domain

Start with the simplest possible case. Write down what GHKL domain 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 GHKL domain 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 GHKL domain 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 GHKL domain

In research: GHKL domain 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 GHKL domain 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: GHKL domain is common in secondary-school and first-year university syllabi. It links to neighbouring topics Protein domains, Protein stubs, so understanding it makes those chapters shorter.
In everyday life: Look for GHKL domain 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 GHKL domain in 20 minutes

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

Frequently asked questions

What is GHKL domain in simple terms?

Why does GHKL domain 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 GHKL domain?

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 GHKL domain.