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UBA protein domain

UBA protein 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 UBA protein domain rather than just read about it. In short: Ubiquitin-associated (UBA) domains are protein domains that non-covalently interact with ubiquitin through protein-protein interactions. Ubiquitin is a small protein that is covalently linked to other proteins as part of intracellular signaling pathways, often as a signal for protein degradation.

UBA protein domain — main illustration
UBA protein domain — illustration

Key takeaways

  • UBA protein 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 UBA protein domain to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of UBA protein domain from memory before moving on to harder problems.

Reference excerpt

Ubiquitin-associated (UBA) domains are protein domains that non-covalently interact with ubiquitin through protein-protein interactions. Ubiquitin is a small protein that is covalently linked to other proteins as part of intracellular signaling pathways, often as a signal for protein degradation. UBA domains are among the most common ubiquitin-binding domains.

Function Proteins containing UBA domains are involved in a variety of additional cell processes, such as nucleotide excision repair (NER), spindle pole body duplication, and cell growth. Protein degradation via the ubiquitin proteasome system (UPS) allows the cell to selectively negatively regulate intracellular proteins. Protein degradation helps to maintain protein quality control, signalling, and cell cycle progression. UBA has been proposed to limit ubiquitin chain elongation and to target polyubiquitinated proteins to the 26S proteasome for degradation. They have been identified in modular proteins involved in protein trafficking, DNA repair, proteasomal degradation, and cell cycle regulation.

Structure UBA domains have a common sequence motif of approximately 45 amino acid residues. They fold into three-helix bundle structures.

Examples

The human homologue of yeast Rad23A is one example of a nucleotide excision-repair protein that contains both an internal and a C-terminal UBA domain. The solution structure of human Rad23A UBA(2) showed that the domain forms a compact three-helix bundle. Comparison of the structures of UBA(1) and UBA(2) reveals that both form very similar folds and have a conserved large hydrophobic surface patch which may be a common protein-interacting surface present in diverse UBA domains. Evidence that ubiquitin binds to UBA domains leads to the prediction that the hydrophobic surface patch of UBA domains interacts with the hydrophobic surface on the five-stranded beta-sheet of ubiquitin. This domain is similar in sequence to the N-terminal domain of translation elongation factor EF1B (or EF-Ts) from bacteria, mitochondria and chloroplasts.

References

Illustrations

UBA protein domain illustration
UBA protein domain: The structure of the prokaryotic elongation factor EF-Ts bound to EF-Tu. Rendered from PDB: 1EFU​.[9]
The structure of the prokaryotic elongation factor EF-Ts bound to EF-Tu. Rendered from PDB: 1EFU​.[9]

Worked examples

Example 1 — a first encounter with UBA protein domain

Start with the simplest possible case. Write down what UBA protein 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 UBA protein 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 UBA protein 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 UBA protein domain

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

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what UBA protein domain means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain UBA protein domain out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is UBA protein domain in simple terms?

Ubiquitin-associated (UBA) domains are protein domains that non-covalently interact with ubiquitin through protein-protein interactions. Ubiquitin is a small protein that is covalently linked to other proteins as part of intracellular signaling pathways, often as a signal for protein degradation.

Why does UBA protein 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 UBA protein 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 UBA protein domain.

Tags

  • Protein domains
  • Protein superfamilies

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