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biology

Nucleolin

Nucleolin 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 Nucleolin rather than just read about it. In short: Nucleolin is a protein that in humans is encoded by the NCL gene. Gene The human NCL gene is located on chromosome 2 and consists of 14 exons with 13 introns and spans approximately 11kb.

Nucleolin — main illustration
Nucleolin — illustration

Key takeaways

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

Reference excerpt

Nucleolin is a protein that in humans is encoded by the NCL gene.

Gene The human NCL gene is located on chromosome 2 and consists of 14 exons with 13 introns and spans approximately 11kb. Intron 11 of the NCL gene encodes a small nucleolar RNA, termed U20.

Function Nucleolin is the major nucleolar protein of growing eukaryotic cells. It is found associated with intranucleolar chromatin and pre-ribosomal particles. It induces chromatin decondensation by binding to histone H1. It is thought to play a role in pre-rRNA transcription and ribosome assembly. It may play a role in the process of transcriptional elongation. It binds RNA oligonucleotides with 5'-UUAGGG-3' repeats more tightly than the telomeric single-stranded DNA 5'-TTAGGG-3' repeats. Nucleolin is also able to act as a transcriptional coactivator with Chicken Ovalbumin Upstream Promoter Transcription Factor II (COUP-TFII).

Clinical significance Midkine and pleiotrophin bind to cell-surface nucleolin as a low affinity receptor. This binding can inhibit HIV infection. Nucleolin at the cell surface is the receptor for the respiratory syncytial virus (RSV) fusion protein. Interference with the nucleolin–RSV fusion protein interaction has been shown to be therapeutic against RSV infection in cell cultures and animal models.

Interactions Nucleolin has been shown to interact with:

References

Further reading

Illustrations

Nucleolin illustration
Nucleolin illustration
Nucleolin illustration
Nucleolin illustration
Nucleolin illustration

Worked examples

Example 1 — a first encounter with Nucleolin

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

In research
Nucleolin 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 Nucleolin 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
Nucleolin is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 2, Proteins, so understanding it makes those chapters shorter.
In everyday life
Look for Nucleolin 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 Nucleolin in 20 minutes

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

Frequently asked questions

What is Nucleolin in simple terms?

Nucleolin is a protein that in humans is encoded by the NCL gene. Gene The human NCL gene is located on chromosome 2 and consists of 14 exons with 13 introns and spans approximately 11kb.

Why does Nucleolin 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 Nucleolin?

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 Nucleolin.

Tags

  • Genes on human chromosome 2
  • Proteins

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