biology

Nuclear prelamin A recognition factor

Nuclear prelamin A recognition factor 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 Nuclear prelamin A recognition factor rather than just read about it. In short: Nuclear prelamin A recognition factor, also known as NARF, is a protein which in humans is encoded by the NARF gene. Function Several proteins have been found to be prenylated and methylated at their carboxyl-terminal ends.

Key takeaways

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

Reference excerpt

Nuclear prelamin A recognition factor, also known as NARF, is a protein which in humans is encoded by the NARF gene.

Function Several proteins have been found to be prenylated and methylated at their carboxyl-terminal ends. Prenylation was initially believed to be important only for membrane attachment. However, another role for prenylation appears to be its importance in protein–protein interactions. The only nuclear proteins known to be prenylated in mammalian cells are prelamin A- and B-type lamins. Prelamin A is farnesylated and carboxymethylated on the cysteine residue of a carboxyl-terminal CaaX motif. This post-translationally modified cysteine residue is removed from prelamin A when it is endoproteolytically processed into mature lamin A. The protein encoded by this gene binds to the prenylated prelamin A carboxyl-terminal tail domain. It may be a component of a prelamin A endoprotease complex. The encoded protein is located in the nucleus, where it partially colocalizes with the nuclear lamina. It shares limited sequence similarity with iron-only bacterial hydrogenases. Alternatively spliced transcript variants encoding different isoforms have been identified for this gene, including one with a novel exon that is generated by RNA editing.

Interactions NARF has been shown to interact with LMNA.

References

Illustrations

Worked examples

Example 1 — a first encounter with Nuclear prelamin A recognition factor

Start with the simplest possible case. Write down what Nuclear prelamin A recognition factor 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 Nuclear prelamin A recognition factor 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 Nuclear prelamin A recognition factor 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 Nuclear prelamin A recognition factor

In research: Nuclear prelamin A recognition factor 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 Nuclear prelamin A recognition factor 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: Nuclear prelamin A recognition factor is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 17, Human chromosome 17 gene stubs, Human proteins, so understanding it makes those chapters shorter.
In everyday life: Look for Nuclear prelamin A recognition factor 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 Nuclear prelamin A recognition factor in 20 minutes

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Frequently asked questions

What is Nuclear prelamin A recognition factor in simple terms?

Nuclear prelamin A recognition factor, also known as NARF, is a protein which in humans is encoded by the NARF gene. Function Several proteins have been found to be prenylated and methylated at their carboxyl-terminal ends.

Why does Nuclear prelamin A recognition factor 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 Nuclear prelamin A recognition factor?

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 Nuclear prelamin A recognition factor.